AVR-Chat

> So, I'm assuming from the replies that, even though the 324P can
> operate at 2.7V to 5.5V, if I power it from 3.3V it can't tolerate 5V
> at an input?  Is that correct?
>
> Thanks,
>
> Bob
>
Well, "can't tolerate 5V is correct". How you deal with it depends a lot
on the design. If it is a hobby project, I might live with marginal logic
high (3.3V out to 5V in) and a series current limit resistor (5V out to
3.3V in) so long as the logic actions are relatively slow and it did not
have to operate at -40C or +70C. In this case, you could probably get away
with the simple solution.

If it is going to be a commercial product, or outside the limits of narrow
temperature range and slow logic, I'd say: do it right.

Jim Wagner
Oregon Research Electronics