Hi Paul,
Thanks for your reply. It is mentioned in datasheet that 'peripheral never sources a voltage outside the valid input voltage range,including power supply ramp-up and ramp-down sequences'.
The PMIC outputs are not sufficient to power some devices like ethernet PHY and HDMI transmitter on our board. So we are using an external SMPS (TPS62142) for generating the 3.3V for these devices.
The accuracy of SMPS is 1.8% and PMIC is 3% so in steady state the pin IO voltage will remain within the range required. But how can we make sure that during supply ramp-up and ramp-down same is followed? We can't make sure that PMIC 3.3V and SMPS outputs start ramping up and down at same time.
In this case what is the suggestion for the IOs which are connected in between these devices?
Regards,
Nikhil