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THVD1451: Two Parts, Same Bus, Different Power Rails

Phillip Karls
Prodigy 50 points
Part Number: THVD1451

Tool/software:

What are the ramifications from using x2 THVD1451:

1. on the same bus

2. on different PCBs, separated by a cable

3. running at different supply voltages (one at 5V, the other at 3.3V)

From what I can tell, the THVD1451 is built to handle this, but I'd like to make sure I'm not missing something.

Thanks!

  • +1
    Guru 316440 points

    Yes, this will work. The only restriction is that they should use the same GND (or at least not more than ±15 V apart).

  • 0
    TI__Guru 72161 points

    Hi Phillip,

    Clemen's is correct as usual.

    As you pointed out, this device was built specifically for this. There shouldn't be any problems. The one that runs on 5V would likely perform a little bit better at driving the cables because the Ron of the drivers will be smaller than the device running on 3.3V. Both devices should still function as expected though.

    -Bobby