Following answer is about ADV7842 power-down sequence 

"The safest thing to do is put a schottkey diode from the low rail to the high rail.  This will make sure the high rail will is never below 0.3V of the low rail which is fine.  It also is a easy way to control power up sequencing."

I didn't understand location on power rail where is recommended schottky diode exactly.How does it connected schottky diode on low rail to high rail.May I request send referring schematics.

[edited by: Kaan Kayabasi at 7:23 AM (GMT -5) on 11 Feb 2021]
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