TUSB1044: Using the TUSB1044 with VCC=0V

Uchida Yasuhide

Prodigy 180 points

Part Number: TUSB1044

Hi,

In OFF mode, I would like to use the VCC voltage of the TUSB1044 is 0V.

I have two questions.

Q1:When I continue to use the TUSB1044 with VCC=0V, is there damage to the TUSB1044 ?

Q2:When VCC is 0V, are differential signal ports(URX1, DRX1, UTX1, DTX1, URX2, DRX2, UTX2, DTX2) Hi-impedance?

Best Regards

over 3 years ago

0 Brian Zhou over 3 years ago

TI__Guru*** 144745 points

when Vcc is 0v, differential signals should be in hi impedance. but if some control pins forced high, it will be back drive the device. Long time wise it will hurt device liability.

0 Uchida Yasuhide over 3 years ago in reply to Brian Zhou

Prodigy 180 points

Hi,

Thank you for your reply.

I have an additional question.

When I continue to use the TUSB1044 with VCC=0V and all control pins=0V, is there damage to the TUSB1044 ?

+1 Brian Zhou over 3 years ago in reply to Uchida Yasuhide

TI__Guru*** 144745 points

in this case, there is no damage

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TUSB1044: Using the TUSB1044 with VCC=0V