TUSB522P: void at high speed pin

Fred Cheng

Expert 5680 points

Part Number: TUSB522P

Tool/software:

Hi team,

I see customer void all of our TX/RX pin , is this recommended or it will cause unexpected impedance change?

over 1 year ago

0 David (ASIC) Liu over 1 year ago

TI__Guru**** 176671 points

Fred

With our package design, do not void the ground under all of TUSB522P TX/RX pin, please leave solid ground under them.

Thanks

David

0 Fred Cheng over 1 year ago in reply to David (ASIC) Liu

TI__Expert 5680 points

Hi David,

what would happen if customer keep its high speed pin ground void?

and is there other package design that may require ground void at high speed pin?

0 David (ASIC) Liu over 1 year ago in reply to Fred Cheng

TI__Guru**** 176671 points

Fred

Most of our re-driver has a thermal pad and that thermal pad acts as a ground reference. If you void the ground under the high speed pins, this will create a poor return path. A poor return path will cause signal integrity issue such as excessive noise.

Thanks

David

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TUSB522P: void at high speed pin