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TCA9548A: Unused outputs

JB63
Prodigy 230 points

Part Number: TCA9548A

Do you see any problem leaving unused outputs disconnected? 

Will the bus hang if we select an output that is floating (no pull-ups)?

Note that the inputs (SCL and SDA) will have pullups to 3.3V.  Vcc also at 3.3V.

Thanks,

John

  • 0
    TI__Guru* 78301 points

    Hey John,

    I assume the disconnected outputs you are refering to are unused channels. Leaving any channels floating should not latch the bus. The only thing i could potentially see occuring is noise could couple onto the floating pins if the channels are enabled. The channels could  inject some noise onto the main bus. I dont think this will be significant unless you are operating in a noisy environment.

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 230 points
    Hi Bobby,

    Okay thanks. Just wanted to make sure the pass FET within the TCA9548 did not need to have the unused channel pulled up.

    Regards,
    John