I'm using ADuM1441 in my design. From main power supply turning On time VDD2(output) power has delay of 500us. But VDD1(input) power takes around 2.6ms from main power supply turn on.
So ADuM1441 gets it's output power first compared input power and hence as per truth table output will be in it's default state which is high for ADuM1441.
This behaviour I'm seeing only in one board out of many boards manufactured. For other boards even with this powering time difference board is working fine.
To avoid such issues in production I need to make sure that power supplied to ADuM1441 and it's timing difference should be within certain margin which is acceptable for ADuM1441 and with which ADuM1441 never finds a failure case.
What is the worst case powering time difference between input(VDD1) and output(VDD2) supply of ADuM1441 which is acceptable.
Nidhi P Shetty