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HD3SS6126: hd3ss6126 - max trace length

Nikhil Patel
Prodigy 30 points
Part Number: HD3SS6126
Hi, I wanted to know if there is a max trace length requirement from USB connector to the input of the mux hd3ss6126 on the PCB? We are running at 10G speed grade. To further clarify, I'm talking about the below trace lengths marked in pink. 
  • 0
    TI__Mastermind 22385 points

    Hi Nikhil,

    There is no set length requirement for the trace you're referring to as this would depend on your PCB trace loss. When a trace has too much loss, your signal will attenuate to the point where the USB host can not read the data passed through.

    Generally, the max length will be the longest trace whose loss your USB host can compensate for. Most USB hosts have an amount of equalization, in terms of dB, that they can recover on the USB signal. If your trace has a higher loss than what the host can compensate for, consider using a low-loss material or a re-driver to help maintain the signal.

    The loss of your trace can be calculated in terms of dB/inch if you know the trace material and the trace width. I can give an estimate on this number if you'd like.

    Best,

    Shane