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SN65HVD485E: SN65HVD485E

navin singh1
Prodigy 210 points
Part Number: SN65HVD485E


Hi Team,

I am using SN65HVD485E in my circuit design. I was doing it breadboard testing and facing one issue with IC.

Even If I don't connect 5V to pin 8(Power pin), but provided 5V to Tx enable(Pin 3) is provided and when i transmit a square wave on Tx line (Pin 4) of 1KHz 5V. I was able to see differential voltage on pin 6 and pin 7.

Can anyone help me answering this question, if I remove 5 V from 8th pin but 3rd pin is provided with 5V, will the IC still works?

Thanks

Navin Singh

  • 0
    Guru 317480 points

    A current is flowing from pin 3 through the ESD protection diode into VCC.

    But applying a voltage of more than VCC + 0.3 V to any logic pin violates the absolute maximum ratings. You might have damaged the device.

  • 0
    TI__Guru 52562 points

    Hi Navin,

    Clemens is correct - You run the risk of damaging the part because you are forcing 5V across the ESD diode which can cause a large current which could end up damaging the part. As mentioned any voltage w.r.t. ground above Vcc + 0.3V on the logic pins can cause damage - in this case the VCC voltage is 0V. 

    If you have any other questions please let me know!

    Best,

    Parker Dodson