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TS3USB30/30E Layout Recommendation

Sadanori Kato
Guru 36520 points
Other Parts Discussed in Thread: TS3USB30, TS3USB30E, TS3USB221E, TS3USB3000, TS3USB221, TS3USB221A
Hi,
We understand that all USB differential pairs should be routed together symmetrically and should be paralleled to each other such as the following application reports.
However, the D1+(D2+) and D1-(D2-) pins of the differential pairs are different side of the package.
So, could you please tell us the layout which you recommend and give us the sample layout for TS3USB30/30E concretely ?
<Application Report>
Best regards,
Kato
  • 0
    TI__Mastermind 45400 points

    Kato,

    Yes, you are correct that you want to route your USB differential pairs together and symmetrically.  For the TS3USB30 and TS3USB30E you need to get the USB + and - traces together as soon as possible.  With USB 2.0 data rates of 480 Mbps I don't believe this to be too much of an issue just will look a little messy coming out of the IC.   I have seen some people take their traces out to the sides like the picture below and Put the D+ and D- traces on a different layer.    

    If this does not work for you, have you looked at our parts in this family the TS3USB3000 and the TS3USB221, TS3USB221A, and TS3USB221E?  These devices have pin outs that maybe better for your application.  Here is link to an e2e post describing the differences between these devices. 

    example of the other pin outs

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Guru 36520 points

    Hi Adam-san,

    Thank you for explaining so politely.
    I understood and will inform our customer of your information.

    Best regards,
    Kato