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TCA9534A: P-port voltage clarification

Part Number: TCA9534A

Hello Guys,

Good day.

Our customer need some clarification on the Electrical characteristics P-port voltage.

The P-port voltage is lower than VCC on data sheet Page6. 
e.g.   IOH=-8mA   VCC 1.65V  MIN P-port voltage 1.2V
Under what condition could this happen ?

The customer is thinking of using 1.8V for VCC and 1.8V for both I2C and P-port, but do you need to deal with it in terms of circuit considering the worst condition?

Thanks and regards,