[time-nuts] Subs for obsolete chips in pictic

Azelio Boriani 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".
>  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.
>
>
>
>
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