[sdiy] unused pins ?

[harry]

Magnus Danielson wrote: <snip>

> Also, please don't leave the VCC of a CMOS chip unconnected, it CAN
> get through undetected since the ESD protection diodes can take an '1'
> and use that to power the rest of the chip!
> I've seen outputs burn to hell when they where loaded with an
> unpowered board full of CMOS.
> That's learning about hot-swap the hard way :-(

I did this too... it was on a sub octave generator. With at least ONE input
pin low... the circuit worked fine.  But when the counter reached the all-zeros
state... wham!  it would glitch badly !!!  I finally noticed that the low output
was
0.7V above ground... and figured it out.  DUH !!!

H^) harry

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