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SN74LV595A-EP: What should the thermal pad be connected to?

Part Number: SN74LV595A-EP

The data-sheet says that the thermal pad should be connected to the correct circuit, but I can't find anything that says what that is. My guess is ground, which would make sense for a thermal plane. But I have run into at least one other chip where the thermal pad is NOT ground. I'm hoping for an authoritative answer before we fab a bunch of boards.