Hi,
We are facing that this parts could be broken.
We are using this tri-state buffer from TTL (Optical receiver) to power device enable, Vcc is 5V.
During tested whole a board that is high power pulse generator (over 10A), this parts seems to be broken when power up.
Phenomena is like latch-up because no output and VCC current is 600 -700mA since we found could be failed.
We believe that unique feature it has, input protection even if Vcc=0, therefore it can use for power generators.
Anyway, it may be caused by hard spike noise or higher surge voltage we guess. And failure mode may be latch up.
Does it make sense?
regards, Keiichi