[Diy_efi] CMOS Levels

[bcroe at juno.com]

That is not right.  The threshold is not 10 and 70%, although 
the OUTPUT drive of some chips might be.  The threshold 
depends on the type chip.  An HC chip INPUT threshold is 
close to 50%, but an HCT chip expects a minimum swing 
of 0.8V to 2V.  Check the specific type to be sure.

Bruce Roe

On Tue, 17 Jun 03 Larry Ing <ling at calweb.com> writes:
> Hi Jeff,
> 
> I was reading your post on the CMOS logic and you don't 
> have it quite correct.  The logic thresholds for CMOS is 
> 10% and 70% of the supply rails, not 50%.  That implies
> that with a 5v supply, the '0' potential is 0.5v and 
> the '1' potential is 3.5 volts.

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