Recommendations on stubs on HX3 (CYUSB3326) downstream connections.

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Anonymous
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Is there some rule-of-thumb related to stub lengths (especially for the USB 3 differential lines)? Maybe compensation with some of the CYUSB3326 configuration?

We have a couple of optional populates. We have minimized the stubs, but when an end device is the target we have small (<5mm) stubs.

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Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

-To reduce the stubs, you can route the lines to the bottom layer using double pair of vias instead of a single pair.

-In case you are unable to avoid stubs, you can reduce the pcb thickness as well.

Please refer to the Application Note for further layout guidelines.

Best Regards,

Sananya

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Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

-To reduce the stubs, you can route the lines to the bottom layer using double pair of vias instead of a single pair.

-In case you are unable to avoid stubs, you can reduce the pcb thickness as well.

Please refer to the Application Note for further layout guidelines.

Best Regards,

Sananya

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