The data sheet says 4.5 volts logic high.
Download the pdf at my site at:
http://www.pic101.com/74HC14.PDF
Rick

Chris Emerson wrote:

> On Sat, Dec 06, 2003 at 06:04:03PM -0500, Rick C. wrote:
> > The output of U1B will never go to 5 volts. Probably over a volt or more
> > from 5 volts.
>
> It does according to my multimeter (at least when unloaded) - note it's
> a 74HC14 not the 7414 I've confusingly got in the diagram.  Or is there
> some other reason?
>
> Thanks,
>
> Chris
>
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