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SN65HVD75: PCB trace impedance

Randy Chen
Intellectual 2395 points
Part Number: SN65HVD75


Hi, 

Customer raised below 2 questions.

1.      Should the PIN A and B trace route as differential signal trace? Any trace impedance requirement?

2.      Is PIN R required trace impedance control?

Best regards,

Randy Chen

  • 0
    TI__Guru 62920 points

    Hi Randy,

    Generally it is best to route A/B as differential signals with characteristic impedance equal to the impedance of the cabling used. For short PCB traces, though, this typically is not critical.  (You could compare the propagation delay of the trace to the rise/fall time of the signal to decide whether or not the trace is considered "short").

    Impedance control is not typically required on the R output.  If the PCB trace is very long, though, you may consider the impedance that results from the trace width and dielectric stack-up and try to match it via placing some series resistance on the R output.

    Max