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SN65LVDS049: device compatibility questions

Downey Kim
Expert 2675 points

Part Number: SN65LVDS049
Other Parts Discussed in Thread: SN65176B, DS90LV019

Hi TI team,

My customer want to use RS422 or RS485 communication with SN65LVDS049 between SN65176B.

Is there any compatibility problem?

Please check it.

Thanks!

Downey Kim.

  • 0
    TI__Mastermind 43795 points

    Hi Downey,

    There are a few interface issues with this idea on the RS422/RS485 differential interface (A/B pins).

    1. The LV049 inputs are recommended to receive a much smaller signal amplitude than the SN65176B A/B pins provide.

    2. The LV049 outputs do not have enough amplitude to drive the SN65176B A/B inputs require

    3. The SN65176B is based on a 5V power supply and the LVDS049 is just a 3.3V supply.

    If you are interfacing to the R and D pins on the SN65176B I would recommend using a 5V LVDS device to make the interface easier.

    One option is the DS90LV019.

    Regards,

    Lee