DS90UB948-Q1: Power down sequence and back powering

I have two questions about power states on my DS90UB949 serializer and DS90UB948 deserializer system:

1. Is there a required power down sequence for either serializer or deserializer? Can I turn off VDD33/VDDIO/VDD12 in any order?
2. When serializer is sending data but deserializer is not powered, is there any possibility of current leakage from the deserializer RIN pins (back powering it's own VDD rails)?

Thanks,
Michael