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DS26LV31T: Are there protection diodes on the RS-422 output pins?

Michael Bishop
Prodigy 40 points
Part Number: DS26LV31T

Are there any built-in protection diodes on the RS-422 pins of the DS26LV31T quad differential line driver chip?  If there are, are they connected to ground or VCC (or both), and at what voltage do they start to turn on?

  • 0
    TI__Guru 62920 points

    Hi Michael,

    We'll need to do a bit of research to track this down since these parts were originally developed over 20 years ago.  We will start looking into it and plan to update you next week.

    Regards,
    Max

  • 0
    TI__Guru 74292 points

    Michael,

    I was able to check this in the lab. It looks like diodes are connected to both VCC and GND, but only on the DI pins.The turn-on voltage is around 2.1V for the positive direction, and -0.5V for reverse breakdown.

    Please let me know if you have any other questions.

    Regards,