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Talk:List of 7400-series integrated circuits

Archive is here: Archive 1: October 2004 – April 2007

Keep out the CMOS parts
I'm not sure who would use this list but shouldn't it confine itself to actual bipolar 5-volt TTL parts, and not CMOS stuff like 744060, etc.? --Wtshymanski 22:16, 7 June 2006 (UTC)

 * I just removed a couple of 744??? entries and added a general comment about such 4000 series equivilents in the notes section. Plugwash 04:54, 26 November 2006 (UTC)

 * This article is, as the title suggests, a "list of 7400 series integrated circuits". Whether they happen to be TTL or CMOS is irrelevant; almost all recent 7400 series parts are CMOS or BiCMOS.

Phillips 74HC7266 datasheet:

http://www.ortodoxism.ro/datasheets/philips/74HC7266.pdf

74230 Octal Buffer/Driver with 3-state outputs

TI SN74AS230A datasheet:

http://www.unicornelectronics.com/ftp/Data%20Sheets/74as230.pdf

74222 16 x 4 Synchronous FIFO Memory with 3-State Outputs

I have a TI SN74LS222N (also listed as SN74LS222N) in my hand, but could not find a datasheet. It appears to be:

SN54LS222A 16 × 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY WITH 3-STATE OUTPUTS

...but I can't be sure without a datasheet.

--Guy Macon (talk) 23:17, 18 January 2007 (UTC)

Do these count as 7400 series ICs?

Texas Instruments SN74AUP1G57 Low-Power Configurable Multiple-Function Gate

Texas Instruments SN74AUP1G58 Low-Power Configurable Multiple-Function Gate

Texas Instruments SN74LVC1G98 Configurable Multiple-Function Gate

Texas Instruments SN74LVC1G97 Configurable Multiple-Function Gate

Texas Instruments SN74LVC1G98 Configurable Multiple-Function Gate

Texas Instruments SN74LVC1G99 Ultra-Configurable Multi-Function Gate With 3-State Outputs

If so, what number should they be listed under? Numbers 74157-58 74197-99 are already used by other parts.

--Guy Macon (talk) 01:40, 19 January 2007 (UTC)

 * These little chips should not be listed here (since they do not have simple base numbers) but there should be a link to page(s) for "other" 74 series, rather than add them all as a section on this page. I do still think the 74HC4xxx (etc) parts do belong in the list though. Maitchy (talk) 00:31, 16 September 2009 (UTC)

Two more TTL chips 74LS827* 	    	10-Bit Inverting Buffer/Driver 74LS828* 	 	10-Bit Buffer/Driver 78.8.120.176 (talk) 12:59, 23 May 2009 (UTC) 12.145.33.227 01:47, 19 January 2007 (UTC)

 * I'd add a new section and list them as "1G57", etc., since AUP and LVC are the families. --Brouhaha 01:37, 20 January 2007 (UTC)

http://www.alldatasheet.com/ttl_list.html has a list of 7400 series parts.

Guy Macon (talk) 19:11, 22 January 2007 (UTC)

a small fix
i changed the links to the non-existant article "Exclusive NOR" (which redirects to the article on logical equality) to point to the more relevant article "XNOR gate". 142.165.95.83 23:06, 31 January 2007 (UTC)

Formatting?
Would adding puncuation between the 74 and the number in the series make the list easier to read? Perhaps make 74299 -> 74-299, 74*299, or just '299? I find the list rather hard to read, but possibly it's just me. Theorbtwo 13:09, 31 March 2007 (UTC)

 * Not a good plan. Manufacturers don't use punctuation in the part numbers and neither should Wikipedia. A list of part numbers is pretty much a "big dumb list" and in my opinion of little value anyway.  --Wtshymanski 14:11, 31 March 2007 (UTC)

 * If someone has the time, a possible improvement would be to list which parts are are available in which type - 7407, 74LS07, 74HC07, etc. Another possible improvement would be to add an obsolete tag to parts which are lo longer available.  This would only be a minor improvement; the main use for a list such as this is to look up which 7400-series part number is a triple 3-input O.C. NAND gate. -- Guy Macon (talk) 18:33, 12 April 2007 (UTC)

Another 'main' use of this list is to find the function of a (possibly discontinued and/or unavailable) 74-series device, so as to figure out a replacement method or design around it. Many otherwise excellent datasheet resources on the Internet often do not include reference to such devices. There are also so-called 74-series devices which are/were manufactured by a limited number of fabs and have fallen out of use; this does not mean that they should be excluded from a list such as this in my opinion especially in the light of the other 'main' use of the list I mention above. It is worth noting that there are several very cooperative suppliers who still sell 'discontinued' or 'obsolete' devices from stock often bought in from companies with an overflow of unwanted stock for earlier products - very useful for repair and prototype modification purposes, as long as you can find and identify the device you are interested in. F.C.Trevor Gale. 80.101.115.225 (talk) 02:24, 11 February 2014 (UTC)

 * Such a table would be tedious to keep current, and I think it's unencyclopedic anyway. Your vendor will be happy to tell you which parts are and aren't available, and in which flavors. -- Mikeblas 18:37, 12 April 2007 (UTC)

 * I like the idea of a better-formatted table. The suggestion of DMahalko is a good nudge in that direction, but I wouldn't want exactly those columns. And I agree it would be very difficult to keep the data current (in fact, it is at the moment, with the limited data already), but it might be worth it. People ask: what is the point of the list? I think one answer is that all the chips with their brief description can be found in one place. Normal google searches return lots of rubbish... if you look for a 74H16 for example, there are many non-TTL results and some sites may list parts that do not exist (since they hope people will request prices for part numbers they don't have - harvested with dubious quality from goodness-knows-where). That says to me that it could be worth having a list that includes the parts within subfamilies that have existed (whether or not they are available today from major suppliers).

Even more, I would like a table arranged by type of device, to find a part number from its type, e.g. this small example:

Maitchy (talk) 01:58, 16 September 2009 (UTC)

Archived old talk page
I just archived this talk page as is, added a link to the archive, and removed all comments that do not apply to the content of the page. Wikipedia has a procedure for suggesting page deletion; that procedure should be followed rather tha arguing about whether the page is useful in it's talk page. If anyone disagrees with the archiving I did, please feel free to revert the talk page page to the previous state.

Guy Macon (talk) 16:48, 18 May 2007 (UTC)

Conversion to table format
A table would be somewhat easier to read than a plain list, especially if additional columns of data are to be added. I have created an example converted table with additional columns here: User:DMahalko/7400table

DMahalko (talk) 04:21, 30 April 2009 (UTC)

That's very useful, IMO. I will try to fill in the blank entries in the next few days, and then I will move it over to the main page. Guy Macon (talk) 11:19, 23 May 2010 (UTC)

Expand List of 7400 series?
I would like to see a page for each of the 74xx/74xxx ic's with a pin-out for each. Since, generally speaking, each 7400-series device uses a "standardized" pin-out, there should not be any ambiguity in that regard. Specs could be ignored since there are diffences between 74xx/LS/HC, etc.

I would be happy to personally spearhead the effort (although it could take a while to complete).

I guess my only real concern is whether anyone besides me would find it useful. —Preceding unsigned comment added by Guy.cooper (talk • contribs) 19:30, 27 October 2010 (UTC)

 * I see severs issues here.

 * First, should there be more information about each IC? I say yes. there are many improvements that can be made.

 * Second, should all that information be crammed into this page? Probably not.  It would quickly become too large.

 * Third, should we create 522 new pages, one per number? No. That's far too many, and manyof those pages will be near-duplicates.

 * How about this as a solution: make a page about Priority Encoders, one about BCD to 7-segment Decoder/Drivers, etc., and list multiple 7400-series logic chips on each page. Then link to them from the descriptions on this page. Guy Macon (talk) 22:32, 27 October 2010 (UTC)

But given that each part number generally describes a different functional part, wouldn't that approach still lead to the creation of a few hundred pages? There would be some overlap where the higher part number represents just a next-generation of a part, so some savings could be realized. Or are you talking about combining all gate devices (without regard to the number of gates or inputs) on the same page? i.e.; All NAND gates on one page, all NOR gates on another, etc. That would realize additional savings. Guy.cooper (talk) 16:47, 11 December 2010 (UTC)
 * Even Texas Instruments doesn't give each part number its own page, especially for the SSI. --Wtshymanski (talk) 17:01, 11 December 2010 (UTC)

74122/123/130
The following entries...

74122: Retriggerable Monostable Multivibrator with Clear

74123: Dual Retriggerable Monostable Multivibrator with Clear

74130: Quad 2-input AND gate Buffer with 30V open collector outputs

74131: Quad 2-input AND gate Buffer with 15V open collector outputs

...appear to conflict with this TI datasheet:

http://focus.ti.com/lit/ds/symlink/sn74123.pdf

Any comments before I edit the Wikipedia page to match the datasheet?

Guy Macon (talk) 22:40, 27 October 2010 (UTC)

74LS78A
Why is 74LS78A, an "LS" device included in the list? --Mortense (talk) 23:42, 18 November 2010 (UTC)
 * If we put references in articles, we'd know this. It looks like the ls version is slightly different logic from the other flavors.  My TTL data book 3rd ed. is around...in a box somewhere. --Wtshymanski (talk) 01:10, 19 November 2010 (UTC)
 * "LS" stands for "low power schottky". The multiple emmiter/base junction is manufactured with this semiconductor technology. Two advantages, one tenth the current required to perform the functionality. better noise immunity at edge threshold transistion time, due to the switching speed of the device. One other major consideration is power consumption and heat production in a typical 19" rack enclosure, common design featuire of early TTL (transistor - transisitor logic) devices used in early data processing circuits. It could also be a suitable interface device for open collector CMOS "74" versions running on 5v due to its low power switching requirement. The "54" series were military grade using ceramic packaging as opposed to plastic, and were selected for wider operating temperature range. Higher currents were also used to trigger logic states. The "h" series were a further enhancement to interact with "real world" current requirements, such as filament display drivers (petrol pumps) and transmission line drivers (modems). I spent many a happy hour with Tandys "cast offs", checking the spec. of "cheap" devices with my home made "plug and pray" tester. One more range was the "flat pack" ceramic and gold lead variety of TTL chip, about 4mm x 3mm, fiddly to play with. Francis E Williams (talk) 16:58, 1 February 2011 (UTC)
 * Much of this is discussed at transistor-transistor logic which has little to do with most of the parts listed in this catalog. I've never seen a live system using flat-pack TTL, which I suspect was aimed more at the aerospace and military areas, which are outside my experience. TTL data books are unpacked, maybe I can find which edition this difference appears in. --Wtshymanski (talk) 21:06, 1 February 2011 (UTC)
 * I gave my c1975 TTL data books to a budding 14 year old radio amateur in 2003. I do however, have somewhere, in my hordes of boxes, a few of those little gold beauties. I`ll try and dig them out. I just like anything gold !. I think the number began with "BHM7 something". (P.S. Here it is  6th posting just below the cherries.) I`ll have a look at TTL article page, should bring back a few memories. I have a 7413, 7490, 7400, 7448, etc. home brew 50hz clock (still works) piccy somewhere, I'll post it to you on here. This catalogue is "so" good, never knew there were so many in the "74" range of chips. Can't wait to see the "54" list when it's ready ! Francis E Williams (talk) 22:24, 1 February 2011 (UTC)

I placed a copy of the relevant datasheet here: (dead link)

As you can see, the H78 does not have the same pinout as the L78 and LS78A, the H78 and L78 do not have the same truth table as the LS78A, and the H78, L78, and LS78A have three different schematics and three different logic symbols.

As far as I know, this was the only time TI violated the rule that calls for the 74H78, 74L78, 74LS78, 74LS78A, etc. to have the same pinout and the same truth table. No other manufacturer appears to have repeated TI's error. I guess TI didn't get the memo about listing the 7400 series being easy and fun...

Alas, the List of 7400 series integrated circuits Wikipedia page is organized according to the rule that TI violated in this one instance, and so we have to list the parts separately. I just redid those three parts on the list with the hope that it will be clear what the differences are. BTW, can anyone find an online source for the TI datasheet I referenced above? I want to put in a note with a citation, but I don't want to link to my personal web page to do it. Guy Macon (talk) 23:09, 1 February 2011 (UTC)
 * The TI TTL Data Book, first edition (copyright 1973), shows the 74L78 and 74LS78 with the same pinout (Vcc on pin 4), but different function tables. The H and the L parts have different pinouts - H has Vcc on pin 14, L and LS have Vcc on pin 4, but the same function table. The second edition (copyright 1981) has the 74LS78A part, instead of plain LS. The 1988 TI book only lists the LS78A part. Motorola's 1980 LS book only lists the LS78A, and the Signetics 1982 "TTL Logic Data Manual" doesn't list any 74X78XX parts at all. I wonder what the story was. Different pinout, and a revised version of the LS chip between '73 and '81. --Wtshymanski (talk) 00:55, 2 February 2011 (UTC)
 * I found this at RS compopnents it leads to all the 7400 data sheets, some here . Looks like where Guy got his data from too. It appears Sygnetics had their own peculair pinouts. Did you like the little gold chips? Francis E Williams (talk) 16:57, 2 February 2011 (UTC) P.S. more:- .Francis E Williams (talk) 17:10, 2 February 2011 (UTC)

Right now the list has:

 * 7478 (Non-TI): Dual Negative Edge Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (pinout not the same as TI 74H78)
 * 74H78 (TI-only): Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (pinout not the same as 74L78/74LS78A)
 * 74L78 (TI-only): Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (pinout not the same as 74H78)
 * 74LS78A (TI-only): Dual Negative Edge Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (pinout not the same as 74H78)

Here is where I am now on a better version:

 * 74H78: Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (pinout not the same as 74L78 / 74LS78 / 74LS78A)

 * 74L78: Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear

 * 74LS78: Dual (Positive Pulse Triggered Negative Edge Triggered?) J-K Flip-Flop with Preset, Common Clock, and Common Clear

 * 74LS78A: Dual Negative Edge Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear

I am signifying the different truth tables by listing Positive Pulse Triggered or Negative Edge Triggered in the description.

I can't find a TI 74LS78 datasheet, but it looks to me like only the 74H78 has a different pinout (please check and see i this is correct).

I don't know whether the 74LS78 is Positive Pulse Triggered Negative Edge Triggered.

Are there any examples of the same full part number having different truth tables or different pinouts?

Guy Macon (talk) 02:02, 3 February 2011 (UTC)

 * This might help clarify, the truth table indicates neg (H - L transition) down arrow. Francis E Williams (talk) 15:21, 3 February 2011 (UTC)

 * That's a 74LS78A datasheet. It is the 74LS78 that I cannot find a datasheet for. Could it be that TI jumped straight from the 74L78 to the 74LS78A, and that no 74LS78 from any manufacturer ever existed? Guy Macon (talk) 03:32, 4 February 2011 (UTC)
 * The LS78 data sheet in the first edition TI book (page 77) has the same function table as the LS78A in the 2nd edition (page 5-24), and both of them show the falling edge transition as the effective clock edge. Just because the LS78 is in the data book doesn't mean that they sold any, though. Squinting at tiny numbers on data sheets, it looks like the LS78A has slightly higher input low current on the clock pin and the D,J,K inputs. The LS78 claims 2 to 4 mA per flip flop and the LS78A says 4 to 6 mA total package current.  But I don't imagine these tiny differences are why there's two versions of the part! --Wtshymanski (talk) 04:06, 4 February 2011 (UTC)

Thanks! It looks like "74LS78" will work for the 74LS78 and 74LS78A, so I am going to change the page to this:

 * 74L78: Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear

 * 74LS78: Dual Negative Edge Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear

 * 74H78: Dual Positive Pulse Triggered J-K Flip-Flop with Preset, Common Clock, and Common Clear (different pinout than 74L78 / 74LS78)

Guy Macon (talk) 16:01, 4 February 2011 (UTC)
 * We probably shouldn't get into all the data sheet details here, but there is a note on the function table saying the logic states on the L and H parts must be kept stable during the top of the pulse, and the state present at the time of the falling edge will govern; I don't know enough about TTL to see why the LS part is immune to this problem. Somewhere on a golf course in Texas, someone is even now teeing up who knows the full sordid story behind the 74X78X parts; why the differing pinouts? Why the revised A part?  Why is there no plain-vanilla part?  I wonder if these were maybe run up for a particular OEM who needed a carload of flip-flops? Center-of-package Vcc and ground is only found in a few TTL parts and I've always wondered why. --Wtshymanski (talk) 16:55, 4 February 2011 (UTC)

...lacks inline citations
The References section of the article has this tag:

"This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations where appropriate. (October 2009)"

It sounds as if this is asking for someone to put up to ten numbered links on every IC on the list showing which are listed in each TTL databook. Or perhaps it is asking for page numbers as well, which would make the references section hundreds of items long.

I agree that making the sources clear is very important, but I am having trouble figuring out how to do that in this particular case. Guy Macon (talk) 22:54, 24 January 2011 (UTC)
 * This is why parts-lists don't belong in an encyclopedia. Soon you'll wind up with  a table saying things like "1/4-20 by 1/2 inch stove bolt, reference, 1/4-20 by 3/4 stove bolt, reference , 1/4-20 by 7/8 stove bolt, reference " - and so forth. Easy and fun to write, but useless in terms of an encyclopedia article. I wanted the whole list gone, but I was shouted down by sacred consensus. Now we'll never know how to check if a 74HC46100 is realy a triple 4-input NAND gate or a quad 3-input NOR gate.  --Wtshymanski (talk) 14:17, 25 January 2011 (UTC)

 * Please do not assume bad faith as you did when you wrote "I was shouted down by sacred consensus." Unless you have evidence that other editors are editing in bad faith (in which case you should take it though the dispute resolution process with diffs showing examples of you being "shouted down"), you should assume that the other editors are, like you, simply trying to improve Wikipedia.

 * I am particularly concerned by your charge of "shouting down." On Wikipedia, consensus does not mean overpowering a dissenting opinion by numerous people who disagree with that opinion. The goal is to seek consensus, a joint agreement that all can live with, and to end up with the dissenter agreeing to edit according to the consensus view. If you really feel you were shouted down, (I don't think you were) WP:DR has a series of steps you can take to resolve the issue.

 * As for your comments about "sacred consensus," consider, if you will, the disagreement we had a while back about negative power factor. You failed to convince me, I failed to convince you, there was no consensus, so it stayed as it was before the disagreement, which happens to be the way you wanted it.  I remain convinced that IEEE Standard 1459 specifically defines its scope as including only circuits where real power flows to the load, and thus by definition cannot be used to describe a circuit where real power flows from the load, but I failed to get a consensus supporting that view, and I accept that lack of consensus. I have not revisited the issue on the talk pages, nor have I edited that page to include what I still think would be a better description of power factor. You should do the same here; accept the fact that you have no consensus for deleting this list, drop the stick, and back slowly away from the horse carcass. Guy Macon (talk) 18:16, 25 January 2011 (UTC)
 * A Wikipedia "consensus" ever only represents a tiny faction of the 100,000+ active editors in any particular deletion discussion. I'm not about to nominate this for deletion again, because the sacred Wikipedia consensus is nearly always in favor of listcruft. Lists are easy and fun to do, as opposed to articles, which take real research and work to write.  I have pointed out here, yet again,why parts lists don't belong on the Wikipedia.   --Wtshymanski (talk) 19:21, 25 January 2011 (UTC)
 * Invoking WP:IAD now. Guy Macon (talk) 21:31, 25 January 2011 (UTC)

Other than "this list should be deleted" (opinion duly noted), nobody has provided a good reason why the inline citations tag should be applied, and there are IMO good reasons why it should not be (see above), so I am removing it. Guy Macon (talk) 14:45, 26 January 2011 (UTC)
 * I can hardly wait till someone nominates this list for Wikiproject Physics. --Wtshymanski (talk) 14:57, 26 January 2011 (UTC)

 * Your sarcasm is not helpful. You have been warned about not being civil. If you keep this up, I will have to decide whether to ignore you completely or to take this through the dispute resolution process, but I would much rather have you voluntarily decide to follow Wikipedia guidelines and policies on civility. You nominated this page for deletion, and there was a strong consensus to keep it. Any other suggestions you might have for improving this page would be very much appreciated. Guy Macon (talk) 16:02, 26 January 2011 (UTC)

74S262
The 74S262 is a 20-pin DIL package IC, in the 74-series of Schottky TTL, and is indeed a character-generator ROM in that technology. It was used in some ITT colour television Teletext Decoders which at the time used a great deal of other TTL in the design. I have several of these devices, date coded for 1977 and 1978 and I knew them as used in 1979. I do have the data sheet for this device but it will take a little time to find where I have it filed. F.C.Trevor Gale. 80.101.115.225 (talk) 02:37, 11 February 2014 (UTC)

Evidence of this part (character generator ROM) is thinly strewn about some documents found on the net, for example in CQ-TV 130 p. 23. Proper datasheet seems to be unavailable online... What to do about it? — Preceding unsigned comment added by 217.226.232.239 (talk) 20:42, 12 December 2011 (UTC)

 * Do you have a link to CQ-TV 130?

 * I Could find no datasheet or pinout for a 74S262 (or 74LS262 or 74HC262, etc).

 * My search found this: http://vss.pl/cq_tv/cq-tv150.pdf (CQ-TV Magazine No. 150) which says

 * "2716 E--PROM - programmed as a substitute for 74S262 (see mod in CQ-TV132)"

 * I could not find CQ-TV Magazine No. 132.

 * This substitution, assuming it isn't a typo, might imply this:

 * A 2716 has 12 address lines and 8 data lines, so it can be programmed to emulate a quad 3-input logic gate IC or a hex 2-input logic gate IC. So a 74S262 could be a TTL logic part.

 * However, the claim above that it is a "character generator ROM" leads me to believe that it is actually a ROM with a character set in it that just happens to have been assigned a number beginning with 74L. In other words not a 7400 series IC.

 * Unless more information is available (a schematic of something using the part would be a huge help, I have to conclude that there is insufficient evidence that a 7400 series IC with the part number 74S262 ever existed. --Guy Macon (talk) 07:49, 13 December 2011 (UTC)
 * "Wireless World" was under the same hallucination back in 1983, Volume 89, according to Google Books. They seem to have got over it.   Parts catalogs are tricksy things, they is...--Wtshymanski (talk) 14:34, 14 December 2011 (UTC)

The 74S262 is now in the main table. Drahtlos (talk) 21:55, 27 November 2018 (UTC)

To Datasheet, Or Not To Datasheet; That Is The Question
To datasheet, or not to datasheet, that is the question: Whether 'tis nobler in the mind to suffer the slings and arrows of missing pinouts and specifications, or to take arms against this sea of troubles, and by linking to a datasheet for each part end them: to link, to cite no more; and by a link, to say we end the heartache, and the thousand natural shocks that electronics engineering is heir to? 'Tis a consummation devoutly to be wished by Wtshymanski, to have a link-free list. To read, perchance to design by; aye, there's the rub, for in that designing without datasheets, what designs may come when we have shipped, must give us pause. There's the respect for remaining within the specification envelope that makes engineering of so long product life: for who would bear the whips and scorns of Wikipedia content disputes, the deletionist is without consensus, the proud inclusionist contumely, the pangs of despised Consensus, the Wikipedia Policies’ delay, the insolence of tendentious editors, and the spurns that patient merit of the unworthy Wikimarkup, when he himself might his Quietus make with a bare Bodkin?

We are gathered together here today to consider the following three edits:

Edit One

Revert One

Revert Two

Revert Three

Revert Four

This discussion touches upon a basic disagreement about what an encyclopedia is, and a deep disagreement by many, many editors about what is widely perceived as` shoving a particular interpretation down our throats against consensus. But it also is about this simple question: to link to datasheets or not to link to datasheets? Which makes for a better article? Please discuss. --Guy Macon (talk) 14:00, 29 December 2012 (UTC)

 * What's most likely to meet EL for a component parts catalogue article like this? – the relevant datasheet. Andy Dingley (talk) 14:55, 29 December 2012 (UTC)

 * Wtshymanski, in your edit you cited WP:NOT. Would you please be so kind as to explain exactly what part of What Wikipedia is not you believe excludes us adding links to datasheets on this page? Thanks! --Guy Macon (talk) 15:49, 29 December 2012 (UTC)
 * I don't have a strong opinion on whether we should include datasheet links or not but if we are going to do it we should be consistent about it. Having a colum with just one entry in it is just crazy. Plugwash (talk) 19:45, 29 December 2012 (UTC)

 * It's not crazy, it's incomplete. Add the others. Andy Dingley (talk) 19:59, 29 December 2012 (UTC)

 * Agreed, but given Wtshymanski's well-known and ongoing behavioral problems (see Requests for comment/Wtshymanski and User talk:DieSwartzPunkt/WTS for details) and his decision to edit war rather than discussing the issue, we need to deal with his tendentious editing first. Once that is resolved, and after we discuss the question of which datasheet to link to (7400 series parts typically have several manufacturers), we can focus on adding more links. --Guy Macon (talk) 20:10, 29 December 2012 (UTC)
 * I just added another 90 datasheets. So, what do we do if there are, say, 3 chipmakers who currently make the 74HC and 74HCT version, one that makes the 74HCT and 74LS versions, and one that no longer exists but used to make the 74LS and 74S versions?

Maybe if we had a hot clue as to why we need to have datasheets in an encyclopedia, we could decide which datasheets to include? Or we could just keep Googling for random .PDF files and linking them here. --Wtshymanski (talk) 15:14, 8 January 2013 (UTC)

 * The reason we need to need to have links to datasheets in an encyclopedia is the same reason why we have any other citation: WP:V. Those 90 datasheet links I added have already had a positive effect; in this edit an IP editor corrected an error where the datasheet and the description on our list did not match.

 * Wtshymanski, the consensus is clearly against you on deleting the links to datasheets, just as earlier it was against you deleting this entire list. Your opinion has been noted. Repeating it again and again with new sarcastic comments is getting tiresome. Either put up an RfC and in it present your best arguments in the hope that having a bunch of new eyes looking at it will result in the consensus changing or drop the stick and back slowly away from the horse carcass. If the existence of this page and of multiple editors who want to improve it bothers you so much, why don't you simply remove the page from your watchlist and get on with your life? --Guy Macon (talk) 18:13, 8 January 2013 (UTC)
 * I thought we didn't like primary, self-published sources? Still no clue as to why you'd look up pinout diagrams in an encyclopedia instead of the manufacturer's literature. I eagerly await the catalog of stove bolts. --Wtshymanski (talk) 22:53, 8 January 2013 (UTC)

Double borrowings
The article currently states

"There is even some reference to double-borrowings, such as 74193 -> 40193 -> 74HC40193[1]!" However other than the one reference the article cites I can't find any evidence that a 74HC40193 exists while a 74HC193 certainly does seem to. This seems to me to be more likely an error in a book than a part number actually used on a device. Plugwash (talk) 23:04, 29 December 2012 (UTC)

 * I agree. Feel free to remove the claim and the part. If someone wants to put it back, they will have to find a citation supporting it. Good catch, BTW. --Guy Macon (talk) 23:53, 29 December 2012 (UTC)

 * Google seems to find 2 more references for a 74HC40193: Modern TTL Circuits Manual, page 170, and Digital Logic IC, page 316, both by R.M.Marston, and both available on Google Books. Neither book gives any further reference (eg. mentioning a manufacturer) except for a self-citation; this looks like a mistaken author to me. Given the prior doubt, I'll remove the claim. 46.223.183.126 (talk) 10:58, 2 September 2017 (UTC)

Do we really need the '1G' parts?
Do we really need to include the '1G' parts in this list? After all, they're just single versions of the IC that's already described. IMO they just clutter the list. MinimanDragon32 (talk) 10:33, 9 May 2014 (UTC)
 * Hm, I find it rather useful to know if a G-variant exists or not. --Matthiaspaul (talk) 11:22, 9 May 2014 (UTC)
 * I think that they should stay. Sometimes you need one more gate and don't have room for anything larger. --Guy Macon (talk) 16:27, 9 May 2014 (UTC)

Yes. Some more than could be added:

 * 741G132 Single 2-input NAND gate with Schmitt Trigger input
 * 741G135 2-Input NAND Schmitt-Trigger with Open Drain Output

71.167.68.202 (talk) 04:19, 17 December 2016 (UTC)

 * It is kind of a clutter. I wonder if we should move the "1G" parts into a new section?  Just a thought.  •  Sbmeirow  •  Talk  • 07:07, 18 December 2016 (UTC)
 * More "1G" parts: 1G57, 1G58, 1G97, 1G98, 1G99. • Sbmeirow  •  Talk  • 07:14, 18 December 2016 (UTC)
 * Also, "2G" and "3G" are useful too: 74LVC2G14, 74LVC2G17, 74LVC3G14, 74LVC3G17. These are also available in other families too, such as "AUP" and others. • Sbmeirow  •  Talk  • 07:14, 18 December 2016 (UTC)

 * Last night, after an anonymous editor removed the 1G parts, I decided today to solve this issue by adding dedicated sections for the 1 gate (1G) parts, plus sections for 2 gate (2G) and 3 gate (3G) parts too. In general, new 1G/2G/3G parts is where industry has been very active in the past decade to support lower voltage logic families, thus it makes sense to add these sections.  •  Sbmeirow  •  Talk  • 04:29, 7 January 2017 (UTC)

 * I'm wasn't sure what to call the new sections, so I took a stab at it. If someone has better ideas, please post them here so we can bounce around some ideas.  •  Sbmeirow  •  Talk  • 04:29, 7 January 2017 (UTC)

Octal vs 8-bit devices
I added the new units column and started to classify the octal xxx parts as having 8 units but I think that that would only apply to units that are wholly independent, no? I.e. if they all share a common enable pin. If so, then we might want to consider renaming those to 8-bit xxx parts (single unit) since they operate in unison.--Hooperbloob (talk) 22:02, 23 October 2014 (UTC)

Missing 74as850
This part exist since we have it in our drawers in our lab. It seems to be a 1-of-16 multiplexor with tristate output. I didn't test the chips, though.128.179.185.88 (talk) 13:50, 10 March 2017 (UTC)

The 74x850 is now in the main table. Drahtlos (talk) 21:57, 27 November 2018 (UTC)

External links modified
Hello fellow Wikipedians,

I have just modified 22 external links on List of 7400 series integrated circuits. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20120512121440/http://www.nxp.com/documents/data_sheet/74HC_HCT03_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT03_CNV.pdf
 * Added archive https://web.archive.org/web/20120512110349/http://www.nxp.com/documents/data_sheet/74HC58_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC58_CNV.pdf
 * Corrected formatting/usage for http://www.nxp.com/documents/data_sheet/74HC_HCT93_CNV.pdf
 * Added archive https://web.archive.org/web/20141222125323/http://www.nxp.com/documents/data_sheet/74HC_HCT126_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT126_CNV.pdf
 * Added archive https://web.archive.org/web/20120516001148/http://www.nxp.com/documents/data_sheet/74HC_HCT147_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT147_CNV.pdf
 * Added archive https://web.archive.org/web/20160304091137/http://ltodi.est.ips.pt/lab-dee-et/datasheets/TTL/74189.pdf to http://ltodi.est.ips.pt/lab-dee-et/datasheets/TTL/74189.pdf
 * Added archive https://web.archive.org/web/20120515213245/http://www.nxp.com/documents/data_sheet/74HC243.pdf to http://www.nxp.com/documents/data_sheet/74HC243.pdf
 * Added archive https://web.archive.org/web/20120515184624/http://www.nxp.com/documents/data_sheet/74HC_HCT251_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT251_CNV.pdf
 * Added archive https://web.archive.org/web/20120526132442/http://www.nxp.com/documents/data_sheet/74HC_HCT299.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT299.pdf
 * Added archive https://web.archive.org/web/20120514201434/http://www.nxp.com/documents/data_sheet/74HCT534.pdf to http://www.nxp.com/documents/data_sheet/74HCT534.pdf
 * Added archive https://web.archive.org/web/20160303231418/http://www.nxp.com/documents/data_sheet/74HC_HCT563_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT563_CNV.pdf
 * Added archive https://web.archive.org/web/20120515233933/http://www.nxp.com/documents/data_sheet/74HC564.pdf to http://www.nxp.com/documents/data_sheet/74HC564.pdf
 * Added archive https://web.archive.org/web/20121224063532/http://www.nxp.com/documents/data_sheet/74HC_HCT640_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT640_CNV.pdf
 * Added archive https://web.archive.org/web/20120514192643/http://www.nxp.com/documents/data_sheet/74HC_HCT652_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT652_CNV.pdf
 * Added archive https://web.archive.org/web/20141023042023/https://www.fairchildsemi.com/datasheets/MM/MM74C926.pdf to https://www.fairchildsemi.com/datasheets/MM/MM74C926.pdf
 * Added archive https://web.archive.org/web/20141023042023/https://www.fairchildsemi.com/datasheets/MM/MM74C926.pdf to https://www.fairchildsemi.com/datasheets/MM/MM74C926.pdf
 * Added archive https://web.archive.org/web/20120515005044/http://www.nxp.com/documents/data_sheet/74HC_HCT4015_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT4015_CNV.pdf
 * Added archive https://web.archive.org/web/20130120073831/http://www.nxp.com/documents/data_sheet/74HC_HCT4059_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT4059_CNV.pdf
 * Added archive https://web.archive.org/web/20120515112811/http://www.nxp.com/documents/data_sheet/74HC_HCT4520_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT4520_CNV.pdf
 * Added archive https://web.archive.org/web/20120515112811/http://www.nxp.com/documents/data_sheet/74HC_HCT4520_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT4520_CNV.pdf
 * Added archive https://web.archive.org/web/20150226135640/http://www.nxp.com/documents/data_sheet/74HC_HCT7046A_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC_HCT7046A_CNV.pdf
 * Added archive https://web.archive.org/web/20120512105906/http://www.nxp.com/documents/data_sheet/74HC7266_CNV.pdf to http://www.nxp.com/documents/data_sheet/74HC7266_CNV.pdf

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74130 / 74131
Per recent changes. AFAICS, there are two versions, for the same base part number (I've not seen this before).

The ur-74 series is a dual monostable. The later 74HCT series part though is an open collector high voltage driver (as AND gates). More sources are welcome, but we probably need to note both of them. Andy Dingley (talk) 20:05, 26 July 2017 (UTC)
 * Checking further, it looks like there might be only one - the monostable (I think I even used one of those, back in the day). The open collector driver is from an unrelated HCT logic series, with a part number beginning "935174..." This shows up as a text match through Google, but it's not a 74xx series part. It doesn't belong here. Andy Dingley (talk) 20:17, 26 July 2017 (UTC)

nxp.com datasheets no more, modified URLs to assets.nexperia.com
Hi everyone.

URLs pointing to nxp.com were all broken when I started looking through earlier today, and it seems like the old NXP datasheets have been moved to a new domain.

I went through and updated nxp.com datasheet URLs where I could, or substituted in some TI variants if I couldnt find the new corresponding datasheet.

Quite a large number were updated, so I wont list them all individually here. I hope everything I have changed is fine (first commit). — Preceding unsigned comment added by Tom.storey (talk • contribs) 17:00, 5 August 2017 (UTC)

 * ✅ - I converted all nxp.com links into nexperia.com links. • Sbmeirow  •  Talk  • 03:34, 17 November 2017 (UTC)

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No datasheets for these parts
As I incrementally cleanup the big table, if I can't find a datasheet then I'm moving those parts here until someone finds a datasheet. Also, I listed missing numbers from 7400 to 74200, in case they exist. • Sbmeirow  •  Talk  • 04:11, 22 July 2018 (UTC) --- Special Thanks to Drahtlos for the massive amount of work after I briefly started a cleanup effort when I added blank cells for the four new columns: Input / Output / Pins / Datasheet. I updated the first 40 rows and added first 100+ datasheets, then Drahtlos did all the rest!!! • Sbmeirow  •  Talk  • 11:05, 3 November 2018 (UTC)
 * 7466 - unknown
 * 74127 - unknown
 * 74129 - unknown
 * 74291 - 4-bit universal shift register, binary up/down counter, synchronous (TI SN74S291)
 * 74306 - 2-bit clock driver (TI SN74BCT306)
 * 74328 - dual voltage- or crystal controlled oscillator (TI SN74LS328)
 * 74486 - Motorola 74LS486
 * 74492 - CRC generator/checker, expandable (Fairchild 74F492)
 * 74523 - 8x8-bit CAM, DIP40 (74F523)
 * 74571 - 50 MHz AND-OR input J-K flip flop (Sprague US74H571)
 * 74572 - 50 MHz AND input J-K flip flop (Sprague US74H572)
 * 74618 - Schmitt trigger positive-nand gates, totem-pole outputs
 * 74619 - Schmitt trigger inverters, totem-pole outputs
 * 74755 - 9-bit to 8-bit latch with ready (Signetics 74F755)
 * 74801 - hex 2-input NAND (TI SN74AS801)
 * 74812 - Fuse Prog. Identity Comparator/Decoder (TI SN74ALS812)
 * 74820 - dual 8-input NAND, DIP20 (TI SN74AS820)
 * 74830 - 16-input AND/NAND, DIP20 (TI SN74AS830)
 * 74836 - EXNOR, 2IP quad + buffer, 4IP, DIP20 (TI SN74AS836)
 * 74847 - serial-in/parallel-in/serial-out 10/9 bit shift register (Signetics 74F847)
 * 74859 - univ. demux/decoder, addressable latch, three-state, DIP24 (TI SN74AS859)
 * 74875 - quad D-type flip-flop sep clr, three-state, DIP24 (TI SN74AS875)
 * 74883 - 19/18-bit parity generator, three-state, DIP24 (74AS883)
 * 74884 - dual 8-bit even parity generator/checker, three-state, DIP24 (TI SN74AS884)
 * 74886 - hex 2-input XOR, DIP20 (TI SN74AS886)
 * 74894 - binary 1-hexadecimal scalers, multifunction, DIP24 (TI SN74AS894)
 * 74957 - octal latched transceiver (TI SN74BCT857)
 * 74958 - octal latched transceiver (TI SN74BCT858)
 * 74959 - octal latched transceiver (TI SN74BCT859)
 * 741110 - multiplier/accumulator (National 74ACT1110)
 * 741776 - burst mode dRAM controller (Signetics 74F1776)
 * 742138 - 3-line to 8-line decoder/demultiplexer (Quality Semi QS74FCT2138)
 * 742158 - quad 2-input data selector, inverting (Quality Semi QS74FCT2158)
 * 742238 - 3-line to 8-line decoder/demultiplexer (Quality Semi QS74FCT2238)
 * 742251 - 8-input multiplexer, three-state (Quality Semi QS74FCT2251)
 * 742258 - quad 2-input multiplexer, inverting, three-state (Quality Semi QS74FCT2258)
 * 742409 - driver?, DIP20 (TI SN74THC2409)
 * 742412 - 11-bit buffer (SN74BCT7412)
 * 742413 - 11-bit buffer (SN74BCT7413)
 * 744018 - 8-input NOR gate (National MM74HC4018)
 * 744047 - monostable/astable multivibrator, retriggerable (Fairchild 74HC4047)
 * 744512 - 8-channel digital multiplexer, three-state (Fairchild 74HC4512)
 * 744703 - FIFO, 16x4 (Fairchild 74HC4703)
 * 747174 - hex D flip-flop w/reset (Philips 74HCT7174)
 * 747203 - dual unbuffered inverter (NJR NJU74HC7203)
 * 747273 - unknown (Philips 74HC7273)
 * 747402 - 65x56-bit FIFO (Harris CD74AC7402)
 * 748163 - 8-bit synchronous binary counter (TI SN74ALS8163)
 * 748169 - 8-bit synchronous binary up/down counter (TI SN74ALS8169)
 * 748816 - logic unit, registered, 16-bit (TI SN74ACT8816)
 * 748833 - 64-bit funnel shifter (TI SN74AS8833)
 * 7411244 - octal buffer/driver, three-state outputs
 * 7429841 - 10-bit bus-interface D-type latch, three-state outputs

 * I would modify the above sightly to require not a data sheet, but a reliable source. As a made-up example, if there are multiple schematics and app notes from multiple vendors talking about the Yoyodyne 74HC31337 being a quad never gate (the output is always zero no matter what the input is -- compare with the related inoperational amplifier and dark emitting diode) but we can't find a datasheet, that would be good enough for inclusion. --Guy Macon (talk) 17:20, 21 August 2018 (UTC)

Buffer vs gate
Hi buffer is usually meant to indicate a higher output current, as in 7420 - dual 4-input NAND gate, vs 7440 - dual 4-input NAND buffer. If we replace buffer with gate in the description then perhaps something like "high current" should be indicated in the Output column. Or we could put 'buffer' back in the description... Cheers, Drahtlos (talk) 20:01, 23 July 2018 (UTC)

 * Buffer is certainly correct, and much the better term. The 74xx family often had two similar devices listed, on a set of gates and the other an equivalent set of buffers. Andy Dingley (talk) 20:50, 23 July 2018 (UTC)

 * 1) I'm glad that both of you commented on this subject matter! When editing and looking at Texas Instrument datasheets, I noticed the "buffer" term in some of the titles. At that time, I did some quick comparison of datasheets, some google searching, then decided to move on and revisit again after I did more research. • Sbmeirow  •  Talk  • 09:16, 24 July 2018 (UTC)

 * 2) I'm not overly fond of using the term "high current" / "higher current" / ..., because these terms are very generic and can mean almost anything that a marketing department wants them to mean. If we can find it, I prefer this article use better descriptive terms, such as "+50% output current" or "1.5x output drive" or "20mA output current" or something that's more obvious and clarifies how the part is different than other chips.  There are 2 things we need to do: 1) determine exactly what is meant by "buffer" on each chip that uses the term, 2) does "buffer" mean the same across multiple chips or different on every chip, 3) after information is gathered, then decide a useful descriptive term for the article. •  Sbmeirow  •  Talk  • 09:16, 24 July 2018 (UTC)

 * 3) I'm not overly fond of using the term "buffer" to mean a high strength output, because it a common term that means "non-inverting inverter" gate. Also, just because the gate is called a buffer, doesn't automatically mean it has a high strength, because a "buffer" might have tri-state outputs at the same output strength. •  Sbmeirow  •  Talk  • 09:16, 24 July 2018 (UTC)

 * 4) In the description column, my preference is using common obvious terms and modern descriptions for the parts, instead of using the EXACT SAME title as listed on old Texas Instruments datasheets. The two might be the same, or slightly different wording that means the same thing, or slightly different to describe it better.  A simple example is "Exclusive OR", it makes more sense in 2018 to use "XOR" in this article.  Also, I prefer use one common way to describe something across the entire article, such as "XOR" everywhere instead of "XOR and "Exclusive OR"; or "buffer" and "non-inverting inverter". •  Sbmeirow  •  Talk  • 09:16, 24 July 2018 (UTC)
 * So what happens if you look at this in terms of fan-out? Is that then a consistent difference between the two sets?  Otherwise I'd go with high and low current, but this would have to be stated and it's going to very widely between the families. Andy Dingley (talk) 15:30, 26 July 2018 (UTC)
 * I have started to mark devices with higher drive capabilities in the Output column as driver, followed by either the fan-out NO or the maximum output current, depending on which value is the same across logic subfamilies. Drahtlos (talk) 18:46, 22 August 2018 (UTC)

RfC Combining 'legacy' vs 'modern chips?
Currently this page attempts to differentiate 'legacy' and 'modern' chips. Can we instead combine the section to focus on as list of functions in the 7400s? First, this creates an arbitrary line between of the age of a part and does not denote whether the part is in production. Second, the 7400 is a 2-input NAND gate where all subsequent families used a 74xx00 as a the NAND function in the family. This would remove the need for the 1G-3G tables since 1G-3G parts are their are device families; this is because the LVC1G and the LVC device families are different technologies and can be seen in the voltage ranges of the devices. Rings48 (talk) 15:21, 26 July 2018 (UTC)

 * I see no distinction in the article between "legacy" and "modern" chips, and I would be opposed to adding one. Maproom (talk) 07:11, 3 August 2018 (UTC)

 * 1) I renamed the sections after this request was posted over 1 week ago, so now the sections are split by pin count, higher number of pins vs lower number of pins. 2) The top table is over 650 part entries, which is "out of control" too big, so adding anything more to it doesn't make sense.  3) I don't have an issues of merging the 3 bottom low-pin-count sections together as a new bottom table. •  Sbmeirow  •  Talk  • 11:19, 3 August 2018 (UTC)

 * Reformat. Wow, now that's a list! I'm no expert in this field but I was impressed by the parent article on the 7400 chips and this list. These chips have been around for a long time and, as a lay person, when I looked at the list I was thinking, "OK, but which of these are newer and probably being used right now, and how manny of these are obsolete." I'm not defending that this is the best way to list the items, but again, it was the prevailing thought in my head. So, I would vote for the list to be something akin to what User:Rings48 suggested, above, where the list be broken out by family, and those should be in order of age. On a side note, and this has nothing to do with my vote, I wonder if the table of eastern-bloc chips in the main article needs to be moved to this page as a separate list rather than taking up space in the main article? StarHOG (talk) 13:25, 7 August 2018 (UTC)
 * The question is wrong. The list presently appears to be sorted by part number, which is not related to function and is not related to age.  It would be useful to order the list by function,and also to indicate which of the circuits are still in production.  Robert McClenon (talk) 19:47, 12 August 2018 (UTC)

Is it more likely that a reader knows a part number (usually because they are looking at a board that has one on it) and wants to look up the function, or is it more likely that a reader is designing a new product using TTL, knows the function, and wants to find out the part number?

How about this; a section with all chips in numeric order, split per WP:NCSPLITLIST, and a section listing non-obsolete chips organized by function? --Guy Macon (talk) 03:08, 13 August 2018 (UTC)

 * I would assume that if you are looking for a specific part number, then you would go to the actual datasheet or manufacturers website. I originally started making edits on this page when every link on this list was to a single manufacturer (Nexperia). Previously the sections of larger and smaller footprints was legacy vs modern; thank you to whomever made the change.
 * I am pro-'function centered'. Almost every part number has a pin-to-pin replacement from another technology family. There are very few functions that have been discontinued and no function (to my knowledge) is different between families. This would mean a datasheet for each function to explain what it is and not a huge list of part numbers and every iteration of it. People can go to a manufacturers website if they want to actually pick out a part to buy. Rings48 (talk) 23:15, 13 August 2018 (UTC)

 * Reconsider: Do we really need this list? WP:NOTCATALOG might not apply in its strictest sense, but in my very humble and non-dogmatic opinion, Wikipedia really shouldn't be a place where people come to look up what a particular chip does. Furthermore I consider that the people who collated this list might like to put the information into WikiData to promote its re-use. --Slashme (talk) 12:00, 20 August 2018 (UTC)

 * The question is really: What is the purpose of this list? Here is my take: A circuit designer would probably go to the manufacturer's website for current data sheets, availability, and pricing, so she is not the target audience of this article. Rather, this article shows how the 7400 series has developed over five decades. As such, in my opinion the list should try to show the 7400 series in its entirety and should specifically include obsolete chips that have long since disappeared from common data books. Very roughly, the numerical order of chips also represents a chronological order. The typical reader would be someone (student, hobbyist, museum curator, repair technician...) with a circuit board or schematic in hand, trying to find out what a certain chip does, often not even knowing the manufacturer. Drahtlos (talk) 16:32, 21 August 2018 (UTC)

 * You make a compelling argument. I take back whatever I said or implied before; you have convinced me that a numeric sort -- possibly split per WP:NCSPLITLIST -- is best. --Guy Macon (talk) 17:23, 21 August 2018 (UTC)

What to do about duplicate part numbers?
As I looked through the old data books, I found several part numbers that were assigned twice for completely different functions, sometimes by different companies, sometimes even by Texas Instruments. How should those be handled? Should we list both assignments (as I started for 74x68 and 74x69)? Or, if we list only one, then which? Here are the conflicts I found:
 * BL54L68Y vs SN74LS68
 * BL54L69Y vs SN74LS69
 * MC74H115 vs TL74115N
 * MC74H116 vs SN74116
 * MC74H118 vs TL74118N/ITT74118
 * MC74H119 vs TL74119N
 * MC74H120 vs SN74120
 * ITT74124 vs SN74S124
 * ITT74130 vs SN74130
 * ITT74131 vs SN74ALS131
 * ITT74135 vs SN74S135
 * ITT74137 vs SN74S137
 * ITT74138 vs SN74LS138
 * ITT74139 vs SN74LS139
 * SN74BCT306 (no datasheet) vs SN74GTLPH306
 * MC74406 vs SN74AVCA406
 * MC74408 vs SN74S408
 * MC74416 vs UCY74S416 vs 74F416 (unclear if the 74F416 made it into production: it is listed briefly as a new product in the 1981 data book and is not listed at all 1985 or later)
 * MC74418 vs 74F418
 * MC74419 vs 74S419
 * MC74424 vs SN74LS424
 * UCY74S426 vs SN74426
 * MC74450 vs SN74S450 vs SN74LS450
 * SN74S451 vs SN74LS451
 * MC74453 vs SN74LS453
 * MC74455 vs 74F455
 * MC74456 vs 74F456
 * MC74460 vs SN74LS460
 * MC74468 vs SN74LS468
 * SN74S480 vs P74PCT480A
 * SN74S481 vs P74PCT481A
 * SN74LS547 vs 74F547
 * SN74LS548 vs 74F548
 * DM74S573 vs SN74ALS573C
 * 74F723 vs 74ACT723
 * 74F725 vs 74ACT725
 * SN74ALS810 vs IDT74FCT810BT
 * MM74C902 vs SN74ALS902
 * MM74C903 vs SN74ALS903
 * MM74C956 vs SN74BCT956
 * SN74ALS1010A vs 74ACT1010
 * SN74F1016 vs 74ACT1016
 * SN74ALS1616 vs SN74GTLPH1616
 * SN74ALS1645A vs SN74GTLPH1645
 * SN74FB2033 vs SN74GTLP2033
 * SN74ACT2151 vs CD74FCT2151
 * SN74ACT2153 vs CD74FCT2153
 * SN74ACT2157 vs CD74FCT2157
 * SN74ACT2158 vs QS74FCT2158
 * SN74ACT/BCT2163 vs QS74FCT2163
 * SN74ALS2238 vs QS74FCT2238
 * SN74S2708 vs 74AC2708
 * SN74CBT3244 vs IDT74FCT3244
 * SN74CBT3245A vs IDT74FCT3245 vs 74LVX3245 vs SN74GTLPH3245
 * SN74ACT7203L vs NJU74HC7203
 * SN74ACT7204L vs SN74HCU7204

Drahtlos (talk) 15:15, 15 September 2018 (UTC)

 * That is a quandary. We definitely don't want to pick one. Two in one entry might make the table too wide.

 * I Like the way you handled it with the 74LS547 and 74F547 entries. --Guy Macon (talk) 10:24, 31 October 2018 (UTC)

 * I couldn't find any info on the 74F416, but this was amusing. --Guy Macon (talk) 10:29, 31 October 2018 (UTC)

Use of the word complementary

 * There are a few instances where the word complementary is used in the table. (I just edited out two with the 74x230/231) Perhaps I'm mistaken but I thought the word complementary specifically refers to a situation like a flip flop with a Q and /Q output. The root word complement designates a relationship between two objects. When a chip has both inverted and non-inverted inputs/outputs that are unrelated, they are not complementary. One does not influence or complement the other in any way, they are just different. The term creates unnecessary ambiguity because the term has meaning in one instance that is not present in the other. A chip like the 74x265 is a great example of a chip with real complementary outputs, while calling the 74x741's enable pins complementary makes no sense. Does anyone care to add some insight for or against removing the word complementary for unrelated functions? I realize the TI 74x741 datasheet uses the word complementary but I'm calling that their mistake.  Jake Little (talk) 02:04, 29 December 2019 (UTC)
 * There's a real problem on WP where sourcing over-writes everything, including truth, clarity and accuracy. You have a good point here - and for the 230 / 231 not being helpfully described as 'octal'. But expect to get some pushback over this about sourcing. Andy Dingley (talk) 02:53, 29 December 2019 (UTC)
 * I agree with both Jake Little and Andy Dingley above. Drahtlos (talk) 17:17, 7 January 2020 (UTC)

74888 anchor
it appears that the template does not handle multiple anchor values correctly (and I don't know how to fix the template). With the restored anchor, List of 7400-series integrated circuits works but List of 7400-series integrated circuits does not. Seeing that 74888 is used more often than 54888, I changed the anchor to the more common case. As a compromise, I will change the anchor from to  so the more common case works now and both will work when the template is fixed. That said, 54888 is used only by redirects which nobody uses and which can probably be removed. Drahtlos (talk) 01:32, 3 June 2020 (UTC)
 * Thanks, good observation! I experimented a bit in the sandbox and found out that the template works fine, but if multiple anchors are placed in the |- table element, only the last one seems to work. This is regardless if the anchors were created by a single or by multiple invocations of the anchor template in a row. This should not happen.
 * As a workaround I have moved the less important anchor into the first column of that table row. While this is not exactly the same position, most browsers still seem to set the focus on the corresponding line correctly.
 * --Matthiaspaul (talk) 09:42, 3 June 2020 (UTC)

Someone please fix sorting
Currently, sorting works one the title rows for each section. Options for fixing include:
 * 1) Make them separate tables instead of one large (if this, maybe also add the collapsible property)
 * 2) Add class="sortbottom" or class="sorttop" to them  — Preceding unsigned comment added by 0w0 catt0s (talk • contribs) 03:53, 20 March 2021 (UTC)

Year of introduction
I think it would be historically interesting and encyclopedically relevant to learn about the exact year of introduction of each of the listed parts, to be mentioned in a separate table column. However, I am well aware that this would be very difficult to track down reliably unless someone has a comprehensive archive of very old chip data sheets, catalogs and magazines. --Matthiaspaul (talk) 18:40, 17 May 2022 (UTC)
 * Agreed, that would be interesting. But given that many parts were introduced in the 1960s and archive.org does not have many documents from that time period, I am not optimistic that it can be done. On top of that, for a number of parts we still don't have a datasheet at all. Drahtlos (talk) 18:47, 17 May 2022 (UTC)
 * Interesting, but not worth adding another column for it, because not easy to validate the year for each part. Also, all of these don't come from the same manufacturer either. • Sbmeirow  •  Talk  • 18:57, 17 May 2022 (UTC)


text:
Bath Side Battery

Bath Side Battery was built in 1811 to cover the anchorage of the port of Harwich, Essex, England, as part of the same complex as the Redoubt, armed with 3 × 24-pdr (11 kg) cannon. The battery was allowed to decay, and after 1990 excavations is marked out on the ground in front of the Anchor pub, Stour Road. This Public House has since been demolished. As of April 2019, the land is still unused, with future plans as yet unknown.

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Bath Side Battery


text:
User talk:Ssx

Would you stop it please. Evercat 18:38, 3 Oct 2004 (UTC)

I've unblocked you. Please don't move any more pages to nonsense titles, because it makes a lot of work for Administrators to clean up. If you really want to move pages around, do it in user subpages like User:Ssx/tttttttttttttt or User talk:Ssx/ffffffffffffffffff, or find an article with an incorrect title that needs to be renamed. Guanaco 03:47, 4 Oct 2004 (UTC)

title: User talk:Ssx


text:
Wikipedia:Magic Collaboration of the Week

Since magic is a specific field, which a lot of people are not be knowledgeable about, magic articles are not likely to receive attention at the other Collaboration of the Week projects.

This project aims to fill gaps about the magic in Wikipedia, to give users a focus and to give us all something to be proud of. You can find a list of magic-related articles on the project page. Anyone can nominate an article and can vote for the nominated articles. Every Sunday, the votes are tallied, and the winner will be promoted for a week to potential contributors.

 * Previous winners that have gone on to become featured articles can be found at /Features.
 * Previous winners can be found at /History
 * Removed nominations can be found at /Removed

Each week a Magic Collaboration of the Week will be picked using this page. This is a specific topic which either has no article, a basic stub page, or an existing article requiring expansion and cleanup. Articles must be directly related to Magic, the aim being to have a featured-standard article by the end of the week, from widespread cooperative editing.

Selecting the next Collaboration of the Week
The next winner will be selected on Sunday, December 29, 2013 at 23:00 (UTC). --Bddmagic (talk) 15:09, 22 November 2013 (UTC)
 * Our next action has been extended for a little while.....in an attempt to continue to improve Indian magicians(and hopefully, bring it up to GA status). --Bddmagic (talk) 01:58, 2 December 2013 (UTC)

Voting
Please vote for as many of the following candidates as you like. Please add only support votes. Opposing votes will not affect the result, as the winner is simply the one with the most support votes (see Approval voting).

Remember: Any registered Wikipedian can vote on this page.

To enter your votes, simply edit the appropriate sections by just inserting a new line with "# ~". This will add your username and a time stamp in a new numbered list item.

Tie-breakers
In case of a tie, voting will be extended for 24 hours. If there is still a tie, the candidate that was nominated first wins.

Quorum call
If no nominations are submitted within 1 week,
 * then a candidate will be chosen randomly from the Backup Candidate list.
 * If there are no candidates on the Backup list,
 * then a random page from the Magic project will be chosen.

If nominations are present,
 * then if no supporting votes are cast within 1 week, voting will be extended for 1 further week.
 * then if no supporting votes are cast within 2 weeks, then the candidate that was nominated first wins.

How to nominate an article
To add a new nomination, please:
 * (1) Copy the template below
 * (2) Paste it at the bottom of the list of nominations
 * (3) Replace "[Date]" with the correct date and "[Date + 7 days]" with the date, plus seven days. Replace [Year] with the current year.
 * (4) Sign your user name with the directions in the template and add a comment for why the article should be nominated.
 * (5) Please preview your addition to make it sure all information is properly filled in and the links are working.

New nominations can be made at any time and should be added at the end of this page. Please use the template below.

article name with double-brackets surrounding it

 * ''Nominated [Date]  [Year]

Support: Comments:
 * 1) [your user name--use '~']
 * [a short description explaining why the article should be the Magic Collaboration of the week]

If the page you are nominating already exists, please add to the top of its talk page. This expands to:

Considerations for nominations

 * 'Please only nominate magic'' articles which:
 * don't currently exist
 * are stubs.
 * or exist but require expanding and cleanup

 * If you have an article that is not related to magic please use Collaboration of the Week, which is not specific to any subject.''

 * For non-stubs, submitting the article to cleanup, peer review, or requests for expansion may also be appropriate.

 * Giving reasons as to why an article should become the MCOTW will help others in casting their votes.

Backup candidates

 * Card force
 * Out of This World
 * Snap change
 * List of magic tricks
 * Michael Ammar
 * P. C. Sorcar
 * P. C. Sorcar, Jr.

Candidates for next week
comment: I'm changing the article soonBddmagic (talk) 15:05, 28 August 2016 (UTC)
 * please nominate a new article...

Ambitious card

 * Nominated November 22  2013

Support: Comments:
 * 1) Bddmagic (talk) 15:13, 22 November 2013 (UTC)
 * This article is in pretty good shape right now....it could just use a bit of tweaking.
 * For the moment, we'll leave Indian magicians up so I can add a few bits and baubbles here and there. From there, we'll probably go to Ambitious card.--Bddmagic (talk) 01:56, 2 December 2013 (UTC)
 * So...done deal....this is promoted to current collab. --Bddmagic (talk) 16:59, 21 December 2013 (UTC)
 * I'll leave this here for a few days.--Bddmagic (talk) 17:08, 21 December 2013 (UTC)
 * Wow....this page is dead!!--Bddmagic (talk) 19:18, 5 April 2019 (UTC)


text: File:Lemonheads It's a Shame About Ray.jpg


text:
Plane (esotericism)

In esoteric cosmology, a plane is conceived as a subtle state, level, or region of reality, each plane corresponding to some type, kind, or category of being.

The concept may be found in religious and esoteric teachings which propound the idea of a whole series of subtle planes or worlds or dimensions which, from a center, interpenetrate themselves and the physical planet in which we live, the solar systems, and all the physical structures of the universe. This interpenetration of planes culminates in the universe itself as a physical structured, dynamic and evolutive expression emanated through a series of steadily denser stages, becoming progressively more material and embodied.

The emanation is conceived, according to esoteric teachings, to have originated, at the dawn of the universe's manifestation, in The Supreme Being who sent out—from the unmanifested Absolute beyond comprehension—the dynamic force of creative energy, as sound-vibration ("the Word"), into the abyss of space. Alternatively, it states that this dynamic force is being sent forth, through the ages, framing all things that constitute and inhabit the universe.

Origins of the concept
The original source of the word plane in this context is the late Neoplatonist Proclus, who refers to to platos, "breadth", which was the equivalent of the 19th-century theosophical use. An example is the phrase en to psychiko platei.

Esoteric conceptions
In the late 19th century, the metaphysical term "planes" was popularised by the theosophy of H. P. Blavatsky, who in The Secret Doctrine and other writings propounded a complex cosmology consisting of seven planes and subplanes, based on a synthesis of Eastern and Western ideas. The planes in Theosophy were further systematized in the writings of Annie Besant and C. W. Leadbeater.

From theosophy the term made its way to later esoteric systems such as that of Alice Bailey. Max Theon used the word "States" (French Etat) rather than "Planes", in his cosmic philosophy, but the meaning is the same.

In the early 20th century, Max Heindel presented in The Rosicrucian Cosmo-Conception a cosmology related to the scheme of evolution in general and the evolution of the Solar System and the Earth in particular, according to the Rosicrucians. He establishes, through the conceptions presented, a bridge between modern science (currently starting research into the subtler etheric plane of existence behind the physical) and religion, in order that this last one may be able to address man's inner questions raised by scientific advancement.

The planes
Many occult, psychic, metaphysical, mystical, and esoteric teachings assert that at least four separate planes of existence exist; however, these differing occult and metaphysical schools often label the planes of existence with differing terminologies. These planes of existence often tend to overlap with each other heavily in both description and conception (especially between schools), and can roughly be delineated into "physical", "mental", "spiritual", or "transcendent" categories.

Do note that the listing of planes below is based mostly on Theosophy. Other religions might structure their planes significantly differently.

Physical plane
The physical plane, physical world, or physical universe, in emanationist metaphysics taught in Neoplatonism, Hermeticism, Hinduism and Theosophy, refers to the visible reality of space and time, energy and matter: the physical universe in occultism and esoteric cosmology is the lowest or densest of a series of planes of existence.

According to Theosophists, after the material plane is the etheric plane and both of these planes are connected to make up the first (physical) plane. Theosophy also teaches that when the physical body dies the etheric body is left behind and the soul forms into an astral body on the astral plane.

The psychical researcher F. W. H. Myers proposed the existence of a "metetherial world", which he wrote to be a world of images lying beyond the physical world. He wrote that apparitions have a real existence in the metetherial world which he described as a dream-like world.

Astral plane
The astral plane, also called the astral world, is where consciousness goes after physical death. According to occult philosophy, all people possess an astral body. The astral plane (also known as the astral world) was postulated by classical (particularly neoplatonic), medieval, oriental, and esoteric philosophies and mystery religions. It is the world of the planetary spheres, crossed by the soul in its astral body on the way to being born and after death, and generally said to be populated by angels, spirits, or other non-physical beings.

In the late 19th and early 20th century the term was popularised by Theosophy and neo-Rosicrucianism. According to occult teachings the astral plane can be visited consciously through astral projection, meditation, and mantra, near-death experience, lucid dreaming, or other means. Individuals that are trained in the use of the astral vehicle can separate their consciousness in the astral vehicle from the physical body at will.

The Theosophist author Curuppumullage Jinarajadasa wrote: "When a person dies, they become fully conscious in the astral body. After a certain time, the astral body disintegrates, and the person then becomes conscious on the mental plane."

Occultist George Arundale wrote:

"In the astral world exist temporarily all those physical entities, men and animals, for whom sleep involves a separation of the physical body for a time from the higher bodies. While we 'sleep', we live in our astral bodies, either fully conscious and active, or partly conscious and semi-dormant, as the case may be, according to our evolutionary growth; when we 'wake', the physical and the higher bodies are interlocked again, and we cease to be inhabitants of the astral world."

Some writers have asserted the astral plane can be reached by dreaming. Sylvan Muldoon and psychical researcher Hereward Carrington in their book The Projection of the Astral Body (1929) wrote:

"When you are dreaming you are not really in the same world as when you are conscious – in the physical – although the two worlds merge into one another. While dreaming, you really are in the astral plane, and usually your astral body is in the zone of quietude."

In his book Autobiography of a Yogi, Paramhansa Yogananda provides details about the astral planes learned from his resurrected guru Swami Sri Yukteswar Giri. Yogananda reveals that nearly all individuals enter the astral planes after death. There they work out the seeds of past karma through astral incarnations, or (if their karma requires) they return to earthly incarnations for further refinement. Once an individual has attained the meditative state of nirvikalpa samadhi in an earthy or astral incarnation, the soul may progress upward to the "illumined astral planet" of Hiranyaloka. After this transitional stage, the soul may then move upward to the more subtle causal spheres where many incarnations allow them to further refine until final unification.

Astral projection author Robert Bruce describes the astral as seven planes that take the form of planar surfaces when approached from a distance, separated by immense coloured "buffer zones". These planes are endlessly repeating ruled Cartesian coordinate system grids, tiled with a single signature pattern that is different for each plane. Higher planes have bright, colourful patterns, whereas lower planes appear far duller. Every detail of these patterns acts as a consistent portal to a different kingdom inside the plane, which itself comprises many separate realms. Bruce notes that the astral may also be entered by means of long tubes that bear visual similarity to these planes, and conjectures that the grids and tubes are in fact the same structures approached from a different perceptual angle.

Mental plane
Charles Webster Leadbeater wrote:

"In the mental world one formulates a thought and it is instantly transmitted to the mind of another without any expression in the form of words. Therefore on that plane language does not matter in the least; but helpers working in the astral world, who have not yet the power to use the mental vehicle."

Annie Besant wrote that "The mental plane, as its name implies, is that which belongs to consciousness working as thought; not of the mind as it works through the brain, but as it works through its own world, unencumbered with physical spirit-matter."

A detailed description of the mental plane, along with the mental body, is provided by Arthur E. Powell, who has compiled information in the works of Besant and Leadbeater in a series of books on each of the subtle bodies.

Causal plane
According to Hindu occultism the mental plane consists of two divisions, the lower division is known as heaven (Svargaloka) and the upper division is known as the causal plane (Maharloka).

Sivaya Subramuniyaswami wrote:

"The causal plane is the world of light and blessedness, the highest of heavenly regions, extolled in the scriptures of all faiths. It is the foundation of existence, the source of visions, the point of conception, the apex of creation. The causal plane is the abode of Lord Siva and his entourage of Mahadevas and other highly evolved souls who exist in their own self-effulgent form—radiant bodies of centillions of quantum light particles."

Sri Aurobindo developed a very different concept of the mental plane, through his own synthesis of Vedanta (including the Taittiriya Upanishad), Tantra, Theosophy, and Max Théon ideas (which he received via The Mother, who was Theon's student in occultism for two years). In this cosmology, there are seven cosmic planes, three lower, corresponding to relative existence (the Physical, Vital, and Mental), and four higher, representing infinite divine reality (Life Divine bk. 1 ch. 27) The Aurobindonian Mind or Mental Plane constitutes a large zone of being from the mental vital to the overmental divine region (Letters on Yoga, Jyoti and Prem Sobel 1984), but as with the later Theosophical concept it constitutes an objective reality of sheer mind or thought.

Buddhic plane
The buddhic plane is described as a realm of pure consciousness. According to Theosophy the buddhic plane exists to develop buddhic consciousness which means to become unselfish and solve any problems with the ego. Charles Leadbeater wrote that in the buddhic plane man casts off the delusion of the self and enters a realization of unity.

Annie Besant defined the buddhic plane as "Persistent, conscious, spiritual awareness. This is the full consciousness of the buddhic or intuitional level. This is the perceptive consciousness which is the outstanding characteristic of the Hierarchy. The life focus of the man shifts to the buddhic plane. This is the fourth or middle state of consciousness."

Sri Aurobindo calls the level above the mental plane the supermind.

Spiritual plane
George Winslow Plummer wrote that the spiritual plane is split into many sub-planes (such as the "Atmic plane") and that on these planes live spiritual being who are more advanced in development and status than ordinary man.

Divine plane
According to some occult teachings, all souls are born on the divine plane and then descend down through the lower planes; however souls will work their way back to the divine plane. Joshua David Stone describes the plane as complete unity with God. Rosicrucianism teaches that the divine plane is where Jesus dwelt in Christ consciousness.

The Summerland
The Summerland is the name given by Theosophists, Spiritualists, Wiccans, and some earth-based contemporary pagan religions to their conceptualization of existence on a plane in an afterlife.

Emanuel Swedenborg (1688–1772) inspired Andrew Jackson Davis (1826–1910), in his major work The Great Harmonia to say that Summerland is the pinnacle of spiritual achievement in the afterlife; that is, it is the highest level, or sphere, of the afterlife we can hope to enter. The common portrayal of the Summerland is as a place of rest for souls after or between their earthly incarnations. The Summerland is also envisioned as a place for recollection and reunion with deceased loved ones.

As the name suggests, it is often imagined as a place of beauty and peace, where everything people hold close to their hearts is preserved in its fullest beauty for eternity. It is envisioned as containing wide (possibly eternal) fields of rolling green hills and lush grass. In Theosophy, the term "Summerland" is used without the definite article "the". Summerland, also called the Astral plane Heaven, is depicted as where souls who have been good in their previous lives go between incarnations. Those who have been bad go to Hell, which is believed to be located below the surface of the Earth and is on the astral plane and is composed of the densest astral matter; the Spiritual Hierarchy functioning within Earth functions on the etheric plane below the surface of the Earth.

Theosophists also believe there is another higher level of heaven called Devachan, also called the Mental plane Heaven, which some but not all souls reach between incarnations—only those souls that are more highly developed spiritually reach this level, those souls that are at the first, second, and third levels of initiation. Devachan is several miles (around 10 km) higher above the surface of Earth than Summerland..

Inhabitants of the various planes
Occult writers such as Geoffrey Hodson, Mellie Uyldert, and Dora van Gelder attempted to classify different spiritual beings into a hierarchy based on their assumed place and function on the planes of existence.

Charles Webster Leadbeater fundamentally described and incorporated his comprehension of intangible beings for Theosophy. Along with him there are various planes intertwined with the quotidian human world and are all inhabited by multitudes of entities. Each plane is purported as composed of discrete density of astral or ethereal matter and frequently the denizens of a plane have no discernment of other ones. Other Theosophical writers such as Alice Bailey, a contemporary of Leadbeater, also gave continuousness to Theosophical concepts of ethereal beings and her works had a great impact over New Age movement. She puts the nature spirits and devas as ethereal beings immersed in macro divisions of an interwoven threefold universe, usually they belong to the etheric, astral, or mental planes. The ethereal entities of the four kingdoms, Earth, Air, Fire, and Water, are forces of nature.

The Dutch writer and clairvoyant Mellie Uyldert characterized the semblance and behavior of ethereal entities on the etheric plane, which, she said, hover above plants and transfer energy for vitalizing the plant, then nourishing themselves on rays of sunlight. She depicted them as asexual gender, and composed of etheric matter. They fly three meters over the ground, some have wings like butterflies while others only have a small face and an aura waving graciously. Some are huge while others may have the size of one inch.

title: Plane (esotericism)


text: User talk:68.67.208.141

title: User talk:68.67.208.141


text:
Talk:Hamburger University

Semi-protected edit request on 4 March 2020
Replace:

with

The reason is because the “campus size” of 80 acres, as the body of the article indicates, is based on the former Oak Brook corporate HQ campus size, and not the size of the campus for Hamburger University itself, or the size of McD’s current corporate campus in the West Loop. If you need references please see those in the article currently. Thanks in advance! 199.66.69.88 (talk) 21:01, 4 March 2020 (UTC)

Also please delete the following from the lede: That specific size of the training facility is a holdover from when Hamburger University was at McD's former Oak Brook headquarters (the identical text was present in previous versions such as this one). Reference #1 itself should be marked as a dead link. 199.66.69.88 (talk) 22:35, 4 March 2020 (UTC)
 * Removed. I don't think that size information is particularly important here. – Ammarpad (talk) 20:46, 10 March 2020 (UTC)

Reference [1] has a broken link
Consider using https://www.mcdonalds.com/qa/en-qa/career_mcd/training-and-education.html instead or an archive KTibow (talk) 17:24, 23 July 2023 (UTC)

McDonald’s Campus Software
McDonald’s now internally use Sabacloud for distance training (thanks covid), which they’re also calling Hamburger University. Is this worth pointing out? ALittleBitQuirky (talk) 03:00, 26 July 2023 (UTC)

title: Talk:Hamburger University


text:
Rhombomere

In the vertebrate embryo, a rhombomere is a transiently divided segment of the developing neural tube, within the hindbrain region (a neuromere) in the area that will eventually become the rhombencephalon. The rhombomeres appear as a series of slightly constricted swellings in the neural tube, caudal to the cephalic flexure. In human embryonic development, the rhombomeres are present by day 29.

Function
In the early developmental stages of the neural tube, segmentation of the neuroepithelium occurs. This segmentation turns into a series of neuromeres. Each segment is called a rhombomere. Every rhombomere develops its own set of ganglia and nerves. Later on in development, rhombomeres form the rhombocephalon, which forms the hindbrain in vertebrates. Each rhombomere expresses its own unique set of genes, which has been shown to influence postnatal rhythmic behaviors, such as respiration, mastication, and walking. In mice, it was shown that the patterning of the neural tube into rhombomeric segments may regulate spatial and temporal appearance of the central pattern generator. Rhombomeres are considered self-governing developmental units, with certain aspects of the rhombomere phenotype being determined at the time of formation. Each rhombomere expresses a unique combination of transcription factors, and so each rhombomeric domain has its own distinct molecular cues that could, theoretically, establish rhombomere-specific patterns of neuronal differentiation. Some of these neuronal populations have been identified in some species. Many of the mature hindbrain nuclei can occupy either one or several rhombomere-derived regions. Vestibular nuclei have been shown to span all the rhombomeres, some correlating with the boundaries of the rhombomeres. Using phosphorylated retrograde labeling, it has been shown that vestibulospinal groups correspond mostly to single rhombomeres rather than over several rhombomeric regions. It has also been shown that the vestibule-ocular groups can either relate to single or multiple rhombomeres, as long as the rhombomeres are closely related. The conclusion drawn was that segmentation of the hindbrain contributes to the way axons project within the vestibular complex. Finally, vestibulospinal neurons have been shown to differentiate in three neighboring rhombomeres, specifically r4, r5, and r6. While vestibule-ocular neurons differentiate across seven, the least differentiated in f4. The method of this differentiate is still unknown, with many types of proteins involved in both the migration, expression of proteins, and for neuron growth and apoptosis. The types of receptors, as well, can vary their activity to be cell-specific.

Rhombomeres determine the pattern of the following maturation of the rhombencephalon into its final parts. The final parts are defined as the pons, cerebellum and medulla.

Cells that form the boundaries of the rhombomere bulges proliferate much faster than those in the middle. It is very difficult for cells to cross from one rhombomere to another, so cells tend to stay within one rhombomere. Each rhombomere eventually gives rise to one or more vestibular neuron types. However, it is not necessarily dependent on segmentation. The motor nerves form depending on rhombomeric patterns, but each nerve can come from either one rhombomere or a pair of rhombomeres that are neighbors. Furthermore, the correct development of the various pharyngeal arches is believed to depend on interactions with specific rhombomeres. With these mechanisms, neural crest cells, for instance, from each rhombomere give rise to different ganglia, or clusters of neurons. Many of these rhombomeres have been mapped to an extent in species other than human. For example, r2 has been shown to give rise to the trigeminal ganglion, while r4 has been shown to give rise to the geniculate ganglion as well as spiral and Scarpa's ganglia. r5 and r6 gives rise to the abducens nerve, and the lower part of r6 and the upper part of r7 gives rise to the petrosal ganglion. Finally, the border of r7 that is not in contact with r6 gives rise to the jugular/nodose ganglia. These mappings, however, cannot be applied cross species.

Studies have shown that the number of neurons in the hindbrain increase as a species evolves. For example, a mouse has more neurons than a slug, but a chimp has more neurons than a mouse. One can assume that part of this comes from having to adapt to an increase in the size of the species. Also, in some species, the rhombomeres are obviously segmented and stay this way for an extended period of time. In other species, the segmentation eventually disappears. For example, rhombomeres are detectable by light microscopy in Swiss/Webster strain of mice for up to embryonic day (E)10.5, but they disappear at E11.5. Many rhombomeres, if compared across species, do not form into the same things. For example, r2 and r3 have been mapped to the trigeminal motoneurons in many species. However, not all species have this correlation.

Each rhombomere has its own set of receptors, and the same receptors can cause different actions. For example, one study showed that there are proteins called Gli1, Gli2, and Gli3 that affect ventral hindbrain development, and are also required for motoneuron development and correct neural patterning in the hindbrain. However, how important are they and what their specific roles are was unclear. By mutating the proteins Gli2 and Gli3, which were especially studied, it was found that Gli2 and Gli3 contain both activation and repression domains, while Gli1 only had activation domains, which were entirely transcriptional. Gli2 was also found to be a stronger activator while Gli3 was a strong repressor. Gli2 and Gli3 had overlapping functions that concerned the patterning of the ventral spinal cord which was important for correct organization and formation of the motoneurons. This was shown when mutation of the Gli3 protein showed only a slight decrease in expression of Olig2, while when the Gli2 protein was mutated, the expression of Olig2 was not detected. Olig2 is normally expressed in the ventral area of the neural tube. Mutations in the Gli2 protein causes more severe damage in the ventral patterning of the hindbrain than that of the spinal cord. This shows that Gli2 performs different functions in the hindbrain that Gli3 is unable to substitute. Gli2 and Gli3 in a developing hindbrain also have distinct functions in the Shh (sonic hedgehog) signal transduction. This is caused by differential modulation of gene expression that is specific to each rhombomere. Finally, studies have shown that in rhombomere 4, the ventral patterning is less affected by the mutation of Gli2. This shows that this particular rhombomere has different requirements for Gli proteins.

The Hox gene also has been shown to play a part in the formation of the cranial motor nerves. The fate of a rhombomere has been shown to be affected by differential expression of the Hox gene. With mutations in the Hox gene, the cranial motor nerves formed in different locations than normal or simply did not form altogether. One possibility for this was that the Hox gene was somehow involved in regionalization within the neural tube, and that expression of this particular gene correlated with the amount of migration that occurred. However, no correlation could be found. Many studies showed small amounts of correlation, but there were equal amounts showing a complete lack of correlation. The amount of correlation that occurred was not enough to draw a concrete conclusion from. This, however, could have happened because studies have only drawn data points from a limited window of time. Another possibility for this lack of correlation is that most studies were based on in situ hybridization, which only maps the location of transcripts rather than proteins. A third possibility is that studies focused on rhombomeres as landmarks, and therefore correlated expression domains to these. While studies were unable to show a relationship between closely related neurons from the rhombomeres and Hox gene expression, the Hox gene is still an important factor when it comes to specification of the neuronal phenotype. The Hox gene was expressed rostrocaudally in the same sequence that was physically within the chromosome and its transcription was regulated by retinoic acid. The Hox gene has been identified in all vertebrates, and the number of Hox genes expressed increases as the vertebrate species diverge farther away from the invertebrate species. Certain neuron groups relate to Hox gene expression. At the r4 level, Hoxb1 is suspected to bestow rhombomere 4 cell identity.

Rhombomeres have also been shown to be able to affect the position that reticulospinal and branchiomotor neurons grow in. Each rhombomere can cause a repeated pattern of rhombomere-specific neurons, including reticulospinal neurons, many of which share properties such as mediolateral location. Reticulospinal neurons also occupy different areas in rhombomeres in different species. It was found in one study that reticular neurons in the lamprey hindbrain, which included isthmic, bulbar, and Mauthner cells, developed in conserved rhombomere-specific positions, similar to those in the zebrafish. In different species, however, reticulospinal neurons occupy different areas in rhombomeres. The trigeminal and facial motor nuclei were also shown to not correlate well with the rhombomere boundaries in the lamprey.

Several studies have shown that the fibroblast growth factor (FGF) is secreted from the midbrain-rhombomere 1 boundary. These proteins instruct cell behavior in the surrounding neuroectoderm. However, the mechanism behind the integration of the signal and the actions that follow remains unclear. Studies have shown that the FGF receptors, or FGFRs act partially redundantly to support cell survival in the dorsal ectoderm, promote r1 tissue identity, and regulate the production of ventral neuronal populations, including the midbrain dopaminergic neurons. In mice, while mutations of the fgfr2 and fgfr3 did not interfere with the development of the midbrain and r1, mutation of fgfr1 caused midbrain and r1 defects.

Studies have shown that the earliest serotonergic neurons were started in the anterior rhombomeres. The most dorsal group of neurons originated from rhombomere 1, and the posterior raphe—which forms from the rhombomeres—is believed to derive from the posterior rhombomeres at a slightly later stage of embryonic development.

Rhombomeres also lead to the creation of vestibular projection neurons, which are probably produced relatively early in the developmental stages of the brain stem.

In the rhombomeres, members of the T-box transcription factor family, have been linked to the proper development of migrating cells. While the hindbrain is developing, trigeminal cell bodies have been shown to migrate dorsolaterally within rhombomeres 2 and 3, while facial cells move dorsolaterally into r5 near the pial surface. Neurons that form the facial nucleus are produced in r4, but move along the anteroposterior axis of the hindbrain into r6, after which they move dorsolaterally. The vestibuloacoustic neurons are also produced in r4. However, they have a unique migration pattern, where their cell bodies cross the midline to the contralateral side. From this one can conclude that multiple subclasses of motor neurons are produced in specific locations in the developing hindbrain. All of them are related by the expression of Tbx20. Motor neurons produced in the hindbrain have Tbx20 selectively expressed. In Tbx20 mutations, the patterning of the regions of the rhombomeres and motor neurons were normal when they were conditional mutations and the neurons were post-mitotic. Tbx20 mutants pre-mitotic showed many cell migration deficiencies, including abnormal dorsolateral migration of the trigeminal cells, arrested tangential migration of the facial neurons, and a lack of transmedian migration of vestibuloacoustic cells. However, hindbrain motor neurons lacking Tbx20 retained the ability to extend neurites into the periphery. The complete elimination of Tbx20 does not cause trigeminal and facial neurons to switch to hypoglossal neurons. Facial neurons have been shown to migrate tangentially from r4 to r6, while trigeminal neurons that are produced in r2 migrate dorsolaterally non-radially. Vestibuloacoustic cells migrate along the midline at r4 contralaterally in the hindbrain. Tbx20 seems to have context-dependent transcriptional activity. This means that it is able to control different cell migration programs specific to different types of cells. It must be able to regulate these patterns by different means.

While many studies have been done on rhombomeres where rhombomeres are grafted cross species, imprecision can occur. One possible source is damage to the rhombomere during the removal, transportation, or grafting process. Another possible source is the mixture of the cells from different species after the rhombomeres have been grafted on, which could lead to the contamination of one rhombomeric region with another, most likely from the neighboring rhombomeres.

title: Rhombomere