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ADG451/452/453 Logic Power Supply?

What is the Logic Power Supply input on these chips for? I can't say I've come across that on any other chip. It's not referenced in the datasheet, just stated that it's +5V.

I'm assuming that if I want to use 3.3V logic that I need to send this pin 3.3V, is that how it  works? Basically just a reference for the logic level or does it require +5V to power something inside the chip?

Thank you,

Martin