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THVD1450: Internal pull-up on D pin

Part Number: THVD1450

Hi Experts,

The datasheet says that THVD1450 D pin supports internal pull-up. 

1. Is it correct that D pin has internal pull-up?

2. With internal pull-up, is any external pull-up resister unnecessary?

3. What is the internal pull-up resister value?

Customer measures D pin and the level of D pin is around 2.5V with VCC=3.3V. No load other than probe is connected on D pin. We are assuming there is several M ohm internal resister.

Regards,

Uchikoshi