The datasheet say the allowed maximum voltage on ADUM1401 inputs are VDD+0.5V. It looks only +0.5V is allowed on inputs when VDD is down(VDD=0V).
Could anyone pls advice whether a series resistor to limit the current into the inputs will allow a voltage bigger than 0.5V(like 5V) applied on inputs when VDD=0V? I mean, a voltage safe for ADUM1401's reliable operation.
If this is feasible, what is the current limit? Thanks in advance.
My application is like this: a ADUM1401B is used to isolate some digital outputs. It is powered by an isolated 5V supply(VDD1). Its D channel (VID) is used to feedback a 5V signal to MCU side. There are some cases that VDD1 is down but that 5V signal is still applied on Pin VID.