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HD3SS3220: USB C length matching

Russell Wetherley1
Expert 4255 points
Part Number: HD3SS3220

Hello E2E,

I am posting on behalf of my customer.

Is there any reason to do any length matching on the USB C other then interpair matching? RX and TX might need a wide match but TX1 and TX2 should be independent right? Are there any good documents that elaborate on this?

Also if any one has any tips for the shortest stubs for the USB 2 lines on a hybrid jack (half SMD half TH) that would be great. The current stub is kinda nasty but I don't see how it could get shorter without muxing it. TI has a great app note for the SMD jacks but it doesn't quite translate to the jack I'm using. Hopefully you've got some fun new stuff when you get back.  I can share the layout over email if you want.

Russell

  • 0
    TI__Guru**** 176811 points

    Russell

    Length matching between TX1 and TX2 is not required, they can be independent length. Even TX1 and RX1 does not have to be the same length. 

    For the hybrid jack, I don't see a way to avoid the stub. The best can be done is to minimize the length of stub as much as possible by routing the USB2 trace as short as possible and minimize the number of layers. 

    Thanks

    David