Talk:Transistor–transistor logic

message: The article at the page http://en.wikipedia.org/wiki/Logic_family says that F and AS came out in 1979 and 1980, not in 1985 like in this article. Something needs to be changed and corrected. The G family from 2004 is not mentioned in this article.
I fixed the "Sub-types" section by moving out of the dotted list the last three sentences since they really weren't in the right place.
ICE77 (talk) 23:16, 19 February 2011 (UTC)
thread_title:  F and AS plus G 

message: Why is not in fig "Two-input TTL NAND gate" a bias resistor for the base of output transistor?  — Preceding unsigned comment added by Oabernhardt (talk • contribs) 14:49, 11 June 2012 (UTC)
replies: text: For one thing, it's a simplified diagram. For another, current will flow from Vcc through the resistor to the base of the input transistor, then through the base-collector junction to the base of the output transistor. Jc3s5h (talk) 16:08, 11 June 2012 (UTC)
replies: text:  Yes, it is an oversimplified diagram. The output transistor will either get is base drive from the resistor through the multiple emitter transistor's B-C junction, or the collector of the of ME transistor will suck out the base charge. If you consider the threshold voltage in the simple diagram, it is around 0.7V -- not the 1.4V of a typical TTL gate. The totem pole circuit lower down is better for details. Glrx (talk) 17:13, 11 June 2012 (UTC)
thread_title: Schematic diagram question

message: Why are the transistors in the diagrams V?  Most use Q for transistors.  Gah4 (talk) 00:40, 3 April 2015 (UTC)
replies: text: The "V"s should be "Q"s, the "U"s shouldn't be there, and in general the style should be similar to that of the illustration above it. Does anyone have time to do a bit of drawing today to fix this? --Guy Macon (talk) 20:44, 3 April 2015 (UTC)
replies: text: It's a pretty simple fix that I could do since it's just tweaking an svg diagram. Apparently those letters are per dewiki conventions, I guess. The three "U"s presumably represent the two input voltages and the output voltage, with upside-down arrows. I suppose the "U"s are redundant and should be removed along with the arrows. After removal, should the two inputs be labeled V1 and V2, and the output Vo (subscripted)? A tricky issue is where to put a new diagram. The original is :File:7400 Circuit.svg which is at Commons and is used in several Wikipedias. I'm not sure I'm cheeky enough to replace that. What do you think? Replace it? Make a new file? What name? Johnuniq (talk) 23:48, 3 April 2015 (UTC)
thread_title:  V or Q 

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thread_title:  External links modified 

message: There is recent discussion, in edit summary, about how long TTL will last.  In 1995, I was at a conference related to FPGAs, with the major vendors there, and started a discussion about the need for affordable FPGA software.  (At the time, it cost thousands of dollars.)  When I was younger, TTL devices were easily available for building things like clocks, or other fun projects. But I suspected that wouldn't last forever, and that younger digital hardware engineers would need something else to play with, and that might be FPGAs. As far as I know, the reason we now have freely available FPGA software is unrelated to that, and surprise, 24 years later we still have TTL chips to play with. I suspect, though, that eventually most will go away. Simpler gates and high current bus drivers might stay around longer. Gah4 (talk) 00:32, 15 May 2019 (UTC)
thread_title:  when 

message: Push–pull output mentions TTL, but then later notes that it is actually (as we know, and all the data sheets say) totem-pole. As well as I know, a real Push–pull output should be somewhat symmetric, which TTL isn't. Gah4 (talk) 06:40, 9 November 2022 (UTC)
thread_title:  [[Push–pull output]]