On Thu, 2007-03-29 at 15:56 -0400, Timothy Weber wrote:
> Debbie wrote:
> > Gentlemen, thanks for the tips. I'm thinking 3V is the way to go. Definitely
> > don't like the idea of 2 regulators. I guess my trouble is I'm somewhat hung up
> > on 5V-TTL as "the" logic level. 
> 
> I was dragged into it myself by a part that's not 5V tolerant.  Not too 
> bad.  You give up ICSP, though.  

I apologize in advance if you're not talking about ICSP with PICs, but
if you're inferring ICSP with PICs doesn't happen below 5V, that's
simply wrong.

The only reason you'd need 5V for ICSP is if you are code protecting
your part and need to do a bulk erase. Otherwise, any ICSP programmer
that allows for the target to supply power can theoretically support
ICSP below 5V. I know for a fact the ICD2 works perfectly fine
programming (and debugging) a part running at 3.3V without issues.

TTYL

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