UCC21750: Single ended PWM input

Part Number: UCC21750

Hi,

I am aware that the UCC21750 can process both differential PWM pair and single-ended PWM, however, my questions are:

When the single-ended PWM is applied, does the IN- need to be connected to GND? 

When the differential PWM pairs are applied, the maximum IN+ and IN- applied is also VCC (5V)?

Many thanks

Weichi