4 Sep
2002
4 Sep
'02
1:04 p.m.
On Wed, 4 Sep 2002, Tony Duell wrote:
I have a few National branded 7473 chips in the parts cabinet and can part
with one if needed.
By the way,
during my debugging, I came across a bad 7473. Its a odd
little JK flip flop, and I'd like to find a replacement. Note that
the 74LS73A is NOT compatible, its got a different truth table!
Should anyone have one of these kicking around, please let me know.
I think I might have some -- I found them the other day when looking for
the (much more common) 7474. They are RS components ('Radiospares' to
old hackers in the UK) brand, so no idea if they are true TI 7473s or
not. But if you can't get one in the States, I can see if I can find
them again and then send you one. Incidentally, does anyone have/know where to get
74Hxxx TTL? I'm working
on a machine that's stuffed with it, and a fair number of chips have
failed. 74LSxxx works in most places, but there are some chips (74H52,
74H54 And-Or-Invert gates, 74H108 JK flip-flops, etc) that don't seem to
have equivalents in other families. If one of those has failed (or fails
in the future) I am going to have problems...
I believe 74H stuff was totally dropped from production, so likely the
only sources for it will be old stock, the surplus market, or old parts
hiding in parts cabinets.
-Toth