Piggybacking 74LS logic chips to confirm a suspected fault

[Alexandre Souza]

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" <cclist at 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
>
>
>
>