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TPS50601-SP: Questions about EN-pin & PWRGD-pin

Part Number: TPS50601-SP
Other Parts Discussed in Thread: LM139-SP,

Hi team

Customer has several questions about EN-pin.

1. What is the state of EN-pin during VIN = PVIN = 0V? 

2. Can the EN pin be controlled by connecting the outputs of the logic IC if the threshold voltage: 1.13 to 1.18V and current: 3.2uA are satisfied?
   Or  do they need to use open-drain or open-collector output logic(like LM139-SP) to interface with the pin?

3. How should they deal with PWRGD pin when the pin is unused?


Noriyuki Takahashi