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TMUXHS221: TMUXHS221NKGR question about off capacitance, XT and circuit

Bruce Dai
Prodigy 190 points
Part Number: TMUXHS221

Hi AE，

      Due to project requirements, please provide the off capacitance for me, Thanks.

      

      I need to confirm the following:

  1. What does 'XT' mean?
  2. could you please provide suggestion about the circuit?

       

      

       Best Regards

       

  • 0
    TI__Mastermind 22015 points

    Hi Bruce,

    Bruce Dai said:
    Due to project requirements, please provide the off capacitance for me, Thanks.

    For off capacitance, we estimate roughly 1-2 pF.

    Bruce Dai said:
    What does 'XT' mean?

    XT is short for cross-talk. In this case, it refers to the amount of crosstalk noise/loss that may occur between the DA and DB lanes.

    Bruce Dai said:
    could you please provide suggestion about the circuit?

    Look at this schematic, I see you have HSD2 pulled down to ground with the /OE pin, which indicates to me that these lanes are not being used. Additionally, I see you do not have the HSD lanes connected to anything, with the USB DP/DM lanes coming into the D+/- Pins. What is the intended route for the USB2 lanes? Are they meant to be grounded, or will HSD1 be connected to a further downstream device?

    Please let me know if you have any other questions.

    Thanks,

    Ryan