[time-nuts] Subs for obsolete chips in pictic

Azelio Boriani azelio.boriani at screen.it
Sun Dec 11 15:15:07 EST 2011


Better use 74HC or 74HCT parts, the 74F should be TTL FAST parts that
require high input current to be driven correctly.

On Sun, Dec 11, 2011 at 9:04 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> Looking at the picric II schematic.  Trying to decide on the bet
> substitute parts for some obsolete parts.
>
> It uses a few 74ACxxx locic family parts that are no longer made.   I
> think the "74H" or "74F" series should work  What do you think?  I may
> have to adapt an SMD part.     They have to work on 5V supply and the
> clock is 10MHz.   There is also a discontinued op amp but they are
> easy to sub.
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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