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PCAL6408AHKX and 5V tolerant issues? ESD breakdown?

Question asked by John Yurcho on Apr 10, 2019
Latest reply on Apr 10, 2019 by G.w. Sun

My design intent for this part is to power VDD(I2C-BUS) at 3.3V and VDD (P) at 3.3V, but I want to use the part to control 5V I/Os through PO-P7 as the part is 5V tolerant.


1. The diagram is taken from their datasheet (page 14) for their I/O protection diodes. What’s the breakdown voltage of the ESD protection diode? See datasheet.






2. Would the ESD diode conduct continuously if I connect P0-P7 at 5V but have VDD(P) at 3.3V? My P0-P7 would be drawing 3-5mA per port pin.

3. Are the P0-P7 5V tolerant if both the VDD supplies are at 3.3V?


Thank you.