Or it is a mechanical fault due to a package/die bond wire becoming an open 
circuit.
This could happen to where the wire joins to either the package or the die pad, 
or
a wire that was fused due to excess current. Hard to tell unless you decap the package.

On 12/22/2015 1:32 PM, Alexandre Souza wrote:
Becaise they have diodes to gnd/vcc. And the common failure of a diode is a
rupture of the barrier and so, it gets shorted. So the gate is shorted to
ground or vcc

Enviado do meu Tele-Movel
Em 22/12/2015 19:29, "Chuck Guzis" <ccl...@sydex.com> escreveu:

On 12/22/2015 01:10 PM, Alexandre Souza wrote:

It works if the gate is open. But if it is shorted to gnd/vcc, you're
in trouble :)

In my experience, this is the case with a lot of 4000-series CMOS. Don't
exactly understand why.

--Chuck





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