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TUSB2E221: TUSB2E221 suggested trace length

Sean Liao (Yu-Sheng)
Expert 7015 points

Part Number: TUSB2E221

Hi sir, 

Customer consider to use TUSB2E221. Here are some questions. 

  1. For the USB2 trace, what would be the suggested trace length? From repeater to connector & from repeater to PCH?
  2. From Intel design guide, it mentioned Host to repeater don't suggest exceed 203mm, but didn't mention the minmum length. Do we have the minimum suggestion?

Thanks a lot!

 

 

  • 0
    TI__Guru**** 163401 points

    Hi Sean:

          The max loss between the PCH and the repeater is -1.2dB, while the max loss between the USB connector and the repeater is 2.0dB.  This translates to around 10 inches of loss between the repeater and PCH, which allows flexible placement in most designs.  The trace distance on the USB-side of the repeater is even greater, around 16 inches; however, some factors can increase or decrease this distance, like board material or the number of vias in the signal path. 

           There is no min spec for trace length between host and eUSB repeater, we recommend 1-2 ich.

    Best

    Brian