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SN65HVD11: Using SN65HVD11-HT RS485 with 5V Input Supply

Vikram Rana
Prodigy 10 points
Part Number: SN65HVD11

In my current system, my receiver RS485 chip is DS16F95AJA while the transceiver chip was a SIPEX 5V RS485. Due to failure of SIPEX part, the only option I have is to replace it with SN65HVD11-HT. While the datasheet says recommended VCC to be 3.3-3.6V, it quotes absolute maximum voltage as 6V from which I am well under. The 5V I have is regulated with maximum variation going up to 5.2V. I had done a trial with SN65HVD11 and adding a 2kOhm termination resistor between A & B. While measuring the signals at both A & B, I see the magnitude of both is higher than 200mV and signal is detected without an issue.

My question and concerns are

1. Are there any detrimental affects on SN65HVD11-HT by powering it with 5V? I am below maximum rating and not exceeding any other environmental conditions.

2. Apart from confirming the differential signals are higher than 200mV, what other checks I should do for the change.

Appreciate your kind response.

VR

  • 0
    TI__Guru 62930 points
    Vikram,
    I can try to answer your questions.
    1) operating outside of the Recommended Operating Conditions (ROC) means that the device is not warranted for any of the operational (timing, parametric, or functional) specifications. Device operational lifetimes are based on the ROC conditions, so lifetime of device will likely be impacted especially at elevated temperatures.

    2) Unfortunately, it is difficult to give recommendations on operation outside of characterized values. It may also be less likely to withstand transients, but this is unknown.

    Hopefully this helps.
    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade