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TCA9803: Is there any restriction on cascading TCA9803 devices?

Kirk Festing
Prodigy 70 points
Part Number: TCA9803

Is there any restriction on cascading TCA9803 devices?  I am planning to use three devices in series to cross power domains and reduce load on segments.  I am not making a "tree," each TCA 9803 will only drive one other TCA9803.  Please let me know if there are potential problems when doing this.

  • 0
    TI__Guru 72691 points
    Hey Kirk,

    The only issue I see is if you accidentally hook up the B sides of the device together. This will work if: A-B-A-B-A-B

    A-B-B-A-A-B for instance will not work because two B sides are in series with each other.

    The only other condition is B side should not have a pull up resistor. (This means any A sides connected to B should also NOT have a pull up resistor)

    Thanks,
    -Bobby