[time-nuts] Subs for obsolete chips in pictic
azelio.boriani at screen.it
Mon Dec 12 05:18:58 EST 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".
> higher than CMOS but might work in some cases. Again, check the data
> (Or try it for a low volume project.)
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