TPD8S009 VCC connection

[FAE] Andrew Wang

Genius 10685 points

Hi Team,

TPS8S009 has optional VCC connection pin.

May I know, what is the purpose of this pin and when do we need VCC connection for ESD device in general case?

Thanks a lot!

Andrew

over 7 years ago

0 [FAE] Andrew Wang over 7 years ago

TI__Genius 10685 points

Hi Team,

Please help, customer is waiting for the answer, thanks.

Andrew

0 Alec Forbes over 7 years ago in reply to [FAE] Andrew Wang

TI__Expert 3500 points

Andrew-

Apologies for the delay, I had to check with a few members of our design team to make sure I had a complete answer for you.

Applying a voltage to Vcc lowers the line capacitance by .1-.15pF on this device, helping to preserve signal integrity. If you are working with very high speed signals (>1Gbps), it would be good to use a Vcc voltage at your max signal swing, but below 1Gbps you should be fine to leave Vcc floating. Physically what is happening is that you are adding a voltage bias over the diode, which lowers the capacitance that is inherent to the diode.

Let me know if your customer has any further questions or if I can support this design any further!

Thanks,

Alec

0 [FAE] Andrew Wang over 7 years ago in reply to Alec Forbes

TI__Genius 10685 points

Hi Alec,

This answer is so helpful, thank you so much!

Andrew

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TPD8S009 VCC connection