HD3SS6126: USB 3.0 transmit via two Mux question

Hao-Yu Chan

Prodigy 10 points

Part Number: HD3SS6126

Do you have any concern to use 2 MUX(HD3SS6126) for USB3.0 signal?

I want to pass compliance test for red marker USB 3.0 standard A.

Thanks

Hao-Yu

over 4 years ago

0 Brian Zhou over 4 years ago

TI__Guru*** 145215 points

Hao:

at 5Gbps, 7" trace loss is 3.5db, each MUX is 1.1db loss, so total loss on A will be 2x 3.5 +2x1.1=9.2db + connector loss. type-A Tx max spec is 10db loss. So it's very marginal.

Regards,

brian

0 Hao-Yu Chan over 4 years ago in reply to Brian Zhou

Prodigy 10 points

Hi Brian

It seems no special concern via two mux, I will control trace length to meet loss spec.

Do I need to add AC CAP between two MUX. Please help to check AC CAP for TX and RX path.

Thanks

Hao-Yu

0 Brian Zhou over 4 years ago in reply to Hao-Yu Chan

TI__Guru*** 145215 points

Hao:

There should be on AC cap 100nf on TX between connector and SOC ( include redriver) though MUX.

Brian

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HD3SS6126: USB 3.0 transmit via two Mux question