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From: Winfield Hill
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: 27 Nov 2002 09:35:17 -0800
Organization: Rowland Institute
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Tony Williams wrote...
> I don't know if this R-idea is viable as a generalised
> way of setting the power-up state of a 2-gate bistable.
> If it is, then operation over 3-18V would be nice.
I see, that's a _good_ goal. What I saw happening in my
Spice model (using who-know-who's original CD4069 model,
but making good sense), was an imbalance between the N
and P devices at low voltages, so that at the nA current
level one device couldn't turn on enough to over-rule the
other's leakage, or something. So real flip-flop action
could only be counted on occurring at supply voltages above
such malfunctions. You'd need the worse-case voltage for
that (I'm sure it's well under 3V), plus the worst-case
current for overcoming a p-channel device at that voltage.
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