7 Mar
2002
7 Mar
'02
3:22 a.m.
Ben Franchuk wrote:
Still check the schematic and a datasheet , as you have less drive
on the LS chip and I think the 74123's and the 74LS123's handle
the clear line differently. On one the clear could trigger the one shot.
Yes, thanks for the hint. At least for that half that died, the clear
line won't be a problem: it's simply pulled up together with the
active-high input (pin 2).
Fanout will also be no trouble: pin 4 only has to drive a single
standard TTL input (or maybe even LS-TTL). Maybe this one will have a
fan-in of 2 or so, but no more.
I'm just not sure about what the other half has to do. I promise, I'll
check before I proceed.
Also they have 74123's here for $1.28
http://www.rocelec.com/
Good price, but when you add shipping, maybe I find something equivalent
around here.
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com