CMOS logic level range

From: Robert Harris <robharris@xxxxxxxxxxx>
Date: Thu, 08 Mar 2007 19:46:41 +1100

I am designing a circuit using all CMOS 4000 series IC's.

It is to be powered by four AA cells, either alkaline or NiCad's.

What is the minimum and maximum voltage that will work as logic level
"1"?

IOW how far off 5V can it go either way?

Thank you,

Rob Harris
.

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