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Original question:

TUSB8041: Schematic Review

TUSB8041: AC Coupling of SSTX/SSRX

Ishay Shavit24
Intellectual 310 points
Part Number: TUSB8041

"Optional but recommended for new designs. SSTX should be AC coupled with 220 nF and SSRX should be AC coupled with 330 nF."

I assume that this is only to the UP pins. Will this be updated in the 'TUSB8041A Schematic Checklist'.

(In the checklist, 0.1uF is only on SSTXp/n_UP, and direct coupling is on SSTXp/n_DN, and all SSRX.)

Thanks, Happy New Year

  • 0
    TI__Guru 60870 points

    Hi Ishay,

    In the checklist, there are 0.1 uF capacitors that are required on all SSTX pins whether upstream facing or downstream facing. 

    Newer USB ECNs allow for adjusting the value of the SSTX cap and adding a SSRX cap, but these are optional.

    Regards,

    JMMN