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TXV0106: Series Resistance on input and output

Steven Richardson
Prodigy 10 points
Part Number: TXV0106
Other Parts Discussed in Thread: TXV0108

Tool/software:

Hi, I wish to use the TXV0106 for power off buffering of an RGMII bus between a SOM and a ethernet switch. The ethernet switch can be powered down to save power if if it is not needed and the RGMII bus would be a source of back powering to the switch without the buffers in place. 

I wish to know if the 10 Ohm damping resistors are on the inputs (A side) or the outputs (B side) or both and if I require external 32 Ohm series resistors on both the input and the output. So a resistor between the SOM output and the buffer and then another resistor between the buffer and the switch?

Thanks

PS. The TXV0106 datasheet is still has some errors copied and pasted from the TXV0108. Specifically the pinout in table 4-1.

  • +1
    TI__Mastermind 32125 points

    Hi Steven,

    Thanks for reaching out as we follow up internally to update.

    Also, the 10 ohm is for the output side (B-side) and external series resistors are typically recommended for the outputs. 

    However, the input coming from SOM output may also benefit from a series resistor. Hence, a 0 ohm resistor placed at the inputs and outputs (to be adjusted if needed) may be helpful dependent on your system environment. If we are sure that the SOM outputs include mismatched impedances, then the series resistor is also recommended, thanks.

    Best Regards,

    Michael.