Talk:List of 7400-series integrated circuits

message: 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)
replies: text: 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)
replies: text: 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)

text: 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)

text: 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)
thread_title:  Keep out the CMOS parts 

message: 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)
thread_title:  a small fix 

message: 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)
replies: text: 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)
replies: text: 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)
replies: text: 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)

text:  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:
GATES 	Quad 2-Input                     	Triple 3-Input	Dual 4-Input    	8-Input	More Inputs
AND   	7408, 7409*, 74130*,74131*       	7411, 7415*   	7421            	  	 
OR    	7432                             	744075        	           	744078 	 
XOR   	74135, 74136*, 74386             	         	           	  	 
NAND  	7400, 7401*,7403*,7426*,7413,7424	7410, 7412*   	7420, 7422*     	7430   	74133, 74134*
 	7437, 7438*, 7439                	         	7440, 74140     	  	 
NOR   	7402, 7436, 74232                	7427          	7423,7425,744002	744078 	 
 	7428, 7433*, 74128               	         	           	  	 
XNOR  	74135, 74266*, 747266            	         	           	  	 
Maitchy (talk) 01:58, 16 September 2009 (UTC)
thread_title:  Formatting? 

message: 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)
thread_title:  Archived old talk page 

message: 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)
thread_title:  Conversion to table format 

message: 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)
thread_title:  74122/123/130 

message: Why is 74LS78A, an "LS" device included in the list? --Mortense (talk) 23:42, 18 November 2010 (UTC)
replies: text: 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)
replies: text: "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)

text: 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)
replies: text: 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)

text: 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)
replies: text: 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)

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

text: 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)
thread_title:  74LS78A 

message: 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)
replies: text: 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)

text: 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)
thread_title:  Double borrowings 

message: 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)
replies: text: Hm, I find it rather useful to know if a G-variant exists or not. --Matthiaspaul (talk) 11:22, 9 May 2014 (UTC)
replies: text: 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)

text:  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)

text:  More "1G" parts: 1G57, 1G58, 1G97, 1G98, 1G99. • Sbmeirow • Talk • 07:14, 18 December 2016 (UTC)

text:  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)
replies: text:  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)

text:  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)
thread_title:  Do we really need the '1G' parts? 

message: 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)
thread_title:  Octal vs 8-bit devices 

message: 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)
thread_title:  Missing 74as850 

message: 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
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thread_title:  External links modified 

message: 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)
replies: text: 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)
thread_title:  74130 / 74131 

message: 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)
replies: text: - I converted all nxp.com links into nexperia.com links. • Sbmeirow • Talk • 03:34, 17 November 2017 (UTC)
thread_title:  nxp.com datasheets no more, modified URLs to assets.nexperia.com 

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thread_title:  External links modified 

message: 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)
replies: text: 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)
thread_title:  No datasheets for these parts 

message: 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)
replies: text: 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)
replies: text:  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)

text:  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)

text:  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)

text:  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)
replies: text:  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)
replies: text:  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)
thread_title:  Buffer vs gate 

message: ::  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)
replies: text: 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)

text: I agree with both Jake Little and Andy Dingley above. Drahtlos (talk) 17:17, 7 January 2020 (UTC)
thread_title:  Use of the word complementary 

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

message: 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)
replies: text: 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)
replies: text:  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)
thread_title:  Year of introduction