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I've been learning about logic gates (from Ben Eater's videos, etc.) and I find myself constantly having to order more ICs, especially 74xxs. Is there a list of ones I should keep on hand to help avoid unnecessary delays from ordering.

This question helped a lot but it didn't seem to cover logic gates.

Mark C
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  • Well you either order every single one ever made or you watch all the videos and make a note of what to order and order them. – Andy aka May 22 '20 at 14:02
  • I was just wondering if there were common ones that everyone should have on-hand. – Mark C May 22 '20 at 14:07
  • Well, if you have enough 7400s you can make pretty much any sort of gate from them. – Finbarr May 22 '20 at 14:12
  • A note, if you're following along with Ben Eater's videos: you can't just hook up LEDs directly to the output of just any old 74 series chip without a resistor; it's fine with the 74LS series that Eater uses, but you'll burn out your LEDs if you do it with a 74HC or other CMOS logic chip. Try to get 74LS or 74ALS where you can if you want to be able to do that (which is very handy for making a breadboard computer, not so much for other purposes). – Hearth May 22 '20 at 18:28

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A lot depends on what you want to do.

I like to keep a fair amount of glue logic around. My most common use parts are '00 (NAND), '32 (OR), 08 (AND), '04 (NOT), '06 (open collector inverters) and '14 (inverters with schmitt trigger inputs) and I really like the SN74LVC1G99 configurable logic gate from which you can implement many boolean functions.

I do keep a few bus latches / drivers around for interfacing projects. ('244. '245, '373 and the 16 bit variants).

There are some items apart from that, but those are the parts I personally use the most.

There will always be a few parts I do not have to hand, but I can usually get them within a day anyway.

Peter Smith
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  • This was exactly the input I was looking for. Thanks! – Mark C May 22 '20 at 14:30
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    Maybe throw in a few '73 or '74 flip-flops too? – Finbarr May 22 '20 at 14:32
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    I remember getting excited in 1976 finding a [7489](http://makeyourownchip.tripod.com/7489.pdf) in the works stores cupboard. Not any more though. – Andy aka May 22 '20 at 14:35
  • I don't really use that many '73, '74 or '76 devices (although I have a few in the trays). Ah - the 7489 brings back memories. Sometimes an amusing datasheet appears, though. https://www.baldengineer.com/links/signetics-write-memory-25120-datasheet – Peter Smith May 22 '20 at 14:39
  • @Finbarr I actually ordered a grab bag of 74xxs from Jameco and there were 18 74AS74s and 1 74AC74 in it. – Mark C May 22 '20 at 15:05
  • @PeterSmith But you're probably using these for actual designs. I'd say for someone learning and experimenting with logic circuits they're much more of an essential. – Finbarr May 22 '20 at 15:43