craig@unicus.UUCP (Craig D. Hubley) (04/09/88)
OK, this is probably the world's dumbest sci.electronics question *but*: How are the pins numbered on a 7404 ? I know that 95% of the time they are numbered, starting to the left of the notch, around the bottom to the right of the notch. However, I have now vaped three of these chips (cheap, thankfully) on this assumption, and am beginning to believe it might be wrong. By the way, how fragile is a 7404 ? Should I count on replacing it later, due to surges and the like ? Just putting it in backwards doesn't work, by the way, that's why I'm asking about it's tolerance. :-) Email answers, I don't think the whole world is interested. Thanks, Craig Hubley, Unicus Corporation, Toronto, Ont. craig@Unicus.COM (Internet) {uunet!mnetor, utzoo!utcsri}!unicus!craig (dumb uucp) mnetor!unicus!craig@uunet.uu.net (dumb arpa)
irwin@uiucdcsb.cs.uiuc.edu (04/12/88)
The 7404 is a hex inverter chip. There are two different pinouts for the 7404, depending on suffix, as follows: SN7404(J,N) SN7404(W) IN OUT IN OUT 1 2 1 14 3 4 3 2 5 6 5 6 9 8 7 8 11 10 9 10 13 12 13 12 VCC pin 14 VCC pin 4 Gnd pin 7 Gnd pin 11 Hope this helps.