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PCA9543A: pca9543a

Minglai Kao
Intellectual 635 points

Part Number: PCA9543A
Other Parts Discussed in Thread: TCA9543A

When the channel is not selected, what are the state of the outputs, SCL and SDA lines, open circuit, at high voltage state?

Thanks

  • 0
    TI__Guru* 79531 points

    Hey Minglai,

    PCA9543A should be high impedance (or open as you call it) on SDA/SCL if no channels are enabled (selected) when it is turned on. Please ensure though you meet the Vcc ramp requirement specified in section 11 of the datasheet though because it is possible if you do not meet the ramp rate requirements, the device could accidentally start up incorrectly. I would recommend using the TCA9543A as it has less strict requirements on the Vcc ramp (has many other advantages like wider Vcc range support, typically our TCA line up comes at a lower cost, pin to pin with our PCA).

    -Bobby

  • 0 in reply to BOBBY
    Intellectual 635 points

    Hi Bobby,

    Thanks.

    Minglai