On March 28, 2005 11:30 pm, Jinx wrote:
> > > Sleeping 12F675 is ~10nA
> >
> > 10nA huh, that's pretty small
>
> The ones I've tried are actually 6nA
>
> > > long-term stability than anything with a 32k xtal like an RTC
> > > chip
> >
> > I don't understand, what does it use for the timebase if not a
> > xtal?
>
> They do use a crystal - must be factory-trimmed or compensated
> or something. Probably around a minute or so per year accurate.
>
> Which implies overall stability of  0.00002% or tuning a 32.768kHz
> crystal to within 0.00655Hz and keeping it there

I think what may have been snipped was that the timebase came from a 
kitchen timer running from the AC power line... which means it is 
"atomic clock" accurate over the long run (despite the slow drifts 
back-n-forth over a day).
So yes, that would definitely beat-out crystal time bases if you are 
looking for long-term stability.   ;-)
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