[time-nuts] Subs for obsolete chips in pictic
Azelio Boriani
azelio.boriani at screen.it
Mon Dec 12 10:18:58 UTC 2011
Yes, your're right: higher than CMOS, I was too high.
On Mon, Dec 12, 2011 at 10:53 AM, Hal Murray <hmurray at megapathdsl.net>wrote:
>
> > Better use 74HC or 74HCT parts, the 74F should be TTL FAST parts that
> > require high input current to be driven correctly.
>
> HC/HCT are pretty slow. I'd carefully check the data sheet timings before
> substituting for AC.
>
> Yes, F/FAST requires some input current, but I wouldn't call it "high".
> It's
> higher than CMOS but might work in some cases. Again, check the data
> sheets.
> (Or try it for a low volume project.)
>
>
>
> --
> These are my opinions, not necessarily my employer's. I hate spam.
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
More information about the Time-nuts_lists.febo.com
mailing list