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SN65HVD1781: Output Typ of A-B (PIN6, PIN7)

Jan Bock
Intellectual 2830 points
Part Number: SN65HVD1781

Tool/software:

Hello Team, 

what kind ouf output structure has the transeiver. My customer asks if it is push pull for a and b channel. 

I found this appnote:

https://www.ti.com/lit/wp/slla545/slla545.pdf

Does this transceiver has the same circuit tree? 

thanks 

Jan

  • +1
    Guru 295500 points

    Yes; all RS-485 drivers have push/pull outputs (with reverse-current and overvoltage protection).

  • +1
    TI__Guru 62590 points

    Hi Jan,

    Yes, that should be correct. The RS485/RS422 differential outputs are basically H-bridge drivers. They will be able to handle slight overvoltage and protect against back biasing using low forward voltage Schottky diodes. (As Clemens has stated).

    I think the older technology used BJTs, newer devices use FETs.

    -Bobby