Other Parts Discussed in Thread: ESD321
We have a large number of "dead" devices. Reason unclear. Most devices do not work on first power up, but there was one (regarding to our tester) that was working, and did not work the other day anymore.
Dead devices work after replacing.
Is there anything incorrect to our circuit?
3.3V is powered by V5.0Bus. So V5.0Bus is powered before 3.3V.
There is a short amount of time during power down, where 3.3V is higher than 5V. It is unclear if this is a problem and if VCCA needs to be lower than VCCB only during normal operation...
OE does not have a pullup to 3.3V. This is done in the Evalboard. Is this needed ?