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USB low-full-high speed peripherals Forum Discussions

NoAr_1540581
Level 5
Level 5
250 sign-ins 100 replies posted 100 sign-ins
Hello
 
AN72332 describes that the line length of D+ and D- should be 75mm or less. I understand the reason for recommending the above, but as a result, without using a redriver etc.  Please tell me the max line length that passed the compliance test.
 
I want to know how much the line length has been extended in the past record. Past max line length result for compliance test.
 
Best Regards
Arai
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Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello Arai-san,

Based on compliance testing at our end in the past, and since USB 2.0 trace length depends on insertion loss of PCB, we should have maximum of 6-7 inches with 2 pairs of via. Re-driver is a must for trace length greater than 7 inches.

Best Regards,

Sananya

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

Hello Arai-san,

Based on compliance testing at our end in the past, and since USB 2.0 trace length depends on insertion loss of PCB, we should have maximum of 6-7 inches with 2 pairs of via. Re-driver is a must for trace length greater than 7 inches.

Best Regards,

Sananya

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