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TMS320F28386D: VDD above VDDIO

Part Number: TMS320F28386D


The datasheet indicates the following:

During the supply ramp, VDD should be kept no more than 0.3 V above VDDIO.

What's happening if it's not the case ?

I am asking this because we are doing the FMEA of our aboard and we need to know the consequence of a failure in our power supplies sequencing.

Best regards,