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TUSB546-DCI: track length of DP signal line

Comi Li
Expert 6415 points
Part Number: TUSB546-DCI

Hi team，

I have a question to ask:

The DP signal line from the GPU to the MUX on the board is 85Ω, but the RX and TX from the MUX to Type-C require 90Ω in the Layout Guidelines.

How far do we actually have to go?

BR，

Comi

  • 0
    TI__Guru**** 177321 points

    Comi

    On the DisplayPort input side, differential input resistance is min of 80ohm and max of 120ohm. So you can use 85ohm differential impedance.

    On the output, differential output impedance is 75 to 120ohm. So you can use differential impedance of 90ohm.

    Thanks

    David