TUSB211A: USB2.0 redriver solution

Hi Jesse,

We have not had any or currently have any supply issues for the TUSB211A, so I believe it is a safe recommendation.

Jesse Chang said:

BTW, the length of USB2.0 signal trace on PCB between two USB hubs is about 150mm, Is USB redriver necessary?

Our USB2 redrivers are passive redrivers, in that these redrivers do not break the USB2 trace in order to boost the signal, and can instead be placed over the USB2 data path and boost the HS signals as they pass underneath the device.

As such, this USB2 redrivers can be placed between the hubs as you want, and if you find that the USB2 redriver is unnecessary or causes overcompensation, the redriver can be removed with no design changes needing to be made to the trace. You can even incorporate the redriver at the lowest level, Boost 0, and will still have some signal compensation at the minimum level.

Please let me know if you have any other questions.

Thanks,

Ryan

Hi Jesse,

Please make sure that the USB DP/DM nets have the same name. The USB2 data lane traces need to stay connected underneath the device, so keeping the traces the same name and just using that would be easier. I do see you have them connected with a 0Ohm resistor/resistor pad, but usually just keeping the same net name if my recommendation.

Looks like you have a 0Ohm resistor for EQ, putting it at level 0, which is a good starting point. I would recommend no 0Ohm resistors along the USB2 lines, unless you need them for ESD or maybe some other purpose. Also, make sure the ferrite bead follow our recommendation:

Otherwise, I see no other issues.

Thanks,

Ryan

Hi Jesse,

The schematic looks more correct with the matching net names, thanks. This should help with ensuring the data lanes stay connected when going under the TUSB211A.

As long as the data lanes stay connected under U602, yes, the redriver can be removed without any worries of the line breaking.

Please let me know if you have any other questions.

Thanks,

Ryan