TS3USB30E: Internal Connection Between D1+/D1-/D2+/D2- and Vcc

Hao Wang14

Part Number: TS3USB30E
Other Parts Discussed in Thread: TS3USB30

Hi Team,

What's the internal connection between D1+/D1-/D2+/D2- and Vcc?

The test shows that there is power-off protection(https://e2e.ti.com/support/switches-multiplexers/f/388/t/658358) betwen D+/D- and Vcc. However, when Vcc is floating, if there is 3.3V PWM signal on D1+, the measured waveform shows that the voltage on Vcc and D+ is 500mV lower than D1+, it seems that there is diode connected between D1+ and Vcc. My questions are:

1. Could you please help confirm the internal connection between D1+/D1-/D2+/D2- and Vcc?

2. If the internal connection between D1+/D1-/D2+/D2- and Vcc is diode, is there any other pin-to-pin(UQFN) two channels 1:2 MUX which also power-off protection between all the input/output pins and Vcc?

Thanks and Best Regards!

Hao

over 4 years ago

0 Malik Barton57 over 4 years ago

TI__Guru 64326 points

Hi Hao,

There is integrated ESD when using TS3USB30E meaning there are diodes in between I/O data pins and VCC.

Are you asking for a P2P device without ESD integrated? This would be TS3USB30.

0 Hao Wang14 over 4 years ago in reply to Malik Barton57

TI__Expert 4415 points

Hi Malik,

Thanks for confirming the internal connection betweeen I/O data pins and VCC.

I'm asking for a P2P device which doesn't has internal diode connected between I/O and VCC, it means that when Vcc is floating, there is no voltage on VCC when the I/O has voltage.

Thanks and Best Regards!

Hao

0 Malik Barton57 over 4 years ago in reply to Hao Wang14

TI__Guru 64326 points

Hi Hao,

Understood, you will want to look at TS3USB30.

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TS3USB30E: Internal Connection Between D1+/D1-/D2+/D2- and Vcc