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TCA9548A: Unused outputs

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

  • 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

  • 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