Make sure you pay close attention to the datasheet regarding 
power-sequencing. Many CMOS devices with multiple power supplies require 
them to be brought up (and down) in a specific order, otherwise internal 
damage will result.

You wouldn't believe all the effort we go to at my day-job not only to 
ensure correct power-sequencing, but also to identify all of the possible 
failure modes if sequencing is wrong.

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