TS3USB221: State of the IC when inputs have voltage applied when VCC is off

Tsugumi Murata

Prodigy 240 points

Part Number: TS3USB221

Hello,

What is the state of this IC when any inputs (D+/D-, S, OE) have voltage applied when the VCC is off / zero?

Will there be any reverse conduction to the VCC ?

Sincerely,

Tsugumi

over 2 years ago

0 Brian Zhou over 2 years ago

TI__Guru** 104165 points

IT can back drive to Vcc if Vcc is 0.

Regards

Brian

0 Tsugumi Murata over 2 years ago in reply to Brian Zhou

Prodigy 240 points

Hello Brian,

Can you elaborate more on the internal structure?

Is there an internal diode from the pins to the VCC? Looking through the datasheet it seems like the "S" input has a buffer but does it still have reverse conduction?

Sincerely,

Tsugumi

0 Brian Zhou over 2 years ago in reply to Tsugumi Murata

TI__Guru** 104165 points

Tsugumi:

After tested on lab, there is no back drive on Vcc. Sorry for the confusion.

Regards

Brian

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TS3USB221: State of the IC when inputs have voltage applied when VCC is off