At 09:58 PM 4/13/2008, you wrote:
It was recently asserted here that TTL parts aren't
hard to find, but
I'm having a heck of a time finding the 74S01 and 74S73.
As far as I can tell from the data sheets, the 74S103 is functionally
and pin-compatible with the 74S73, but a little faster. I wouldn't mind
substituting that, but it doesn't seem any easier to find.
The 74S03 and 74S107 are non-pin-compatible replacements for the 74S01
and 74S73, but I'd much prefer to stick with pin-compatible parts.
Unicorn Electronics can get all of those ICs, but you'll have to
order a minimum quantity.
http://www.unicornelectronics.com/prod.htm