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SN65LVPE512RGER support length

Shu-Cheng LIN
Guru 11785 points

Hi Sirs,

We have use SN65LVPE512RGER, now have some question.

Because have board size concern,

Our design is CPU---(7600-8000 mils)--512---(500-800 mils)---connect. The setting is default (EQ=7dB and let OS and DE as floating)
For now, we couldn't have super speed signal output at 512, but if remove 512 we could have output but driving too weak.

We not sure is 512 is too close connector?(500-800 mils)

If yes, please kindly share experience for us, thanks for your great help.

  • 0
    TI__Intellectual 2480 points

    the problem is that miss installing 0.1uF AC coupling on the paths of pin 8/9 and pin 19/20. The 0.1uF Ac coupling capacitors are must required on the TX and Rx input/output paths of LVPE512. 

    Besides the 0.1uF AC coupling on the paths of pin 8/9 and pin 19/20, we recommend reserved at least 1" trace distrance between LVPE512 and USB connector.   please refer to figure 8 of datsheet for detail.