to distinguish
between a 'high' output and a floating one, and thuse
don't fial chips where the upper transistor of the output stage has
failed. And yes, I've had that.
Hi
It must have been a Fairchild part. When at Intel they were
notorious for that.
I'm not sure it was. I've seen it a few times (i.e. more than once),
always in 74Hxx numbers in HP98x0 calculators. I suspect the former is
significant, the latter isn't.
-tony