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From: Winfield Hill
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: 12 Nov 2002 05:10:20 -0800
Organization: Rowland Institute
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Terry Pinnell wrote...
>>> John Devereux wrote:
>>>> What was wrong with Kevins CMOS flip-flop driving a power
> I must have missed the CMOS flip-flop circuit from Kevin you
> mentioned. But presumably it's similar to this, which in turn
> I based on a circuit from Spehro.
> As you see, its consumption wasn't zero, but I bet it would be
> much lower with more modern versions of the 4013 than the
> ancient one I used.
Your CD4013 shouldn't have drawn any current at 10V, let alone
the 500uA as you saw. That was a defective chip!
Ancient CMOS also required zero quiescent power, this was true
dating back to the mid 60's when CMOS was first invented by RCA
and called COS/MOS. In the early 70s my company used tens of
thousands of those chips at 12V and we tested each one with a
2uA pass/fail limit. We very rarely had to replace a chip.
While those early chips were perfectly happy with 15V supplies,
it's true that more recent versions are happy at 20V, or higher
as we saw with the recent mistreatment detailed on these pages.
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