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TCA9539-Q1: Output state during power-up

Diego Lewis
Intellectual 1540 points

Part Number: TCA9539-Q1

Hi Team,

When using the TCA9539-Q1 as an output, how can I verify that the output will remain low during start up?

Does the TCA9539-Q1 support a pull-down resistor in the outputs? 

Regards, Diego

  • 0
    TI__Guru* 78411 points

    Hey Deigo,

    "When using the TCA9539-Q1 as an output, how can I verify that the output will remain low during start up?"

    This device does not initially start up as an output, it is configured as a high impedance input upon start up (floating). Using pull down resistors will work.

    "Does the TCA9539-Q1 support a pull-down resistor in the outputs? "

    Having pull down resistors on the device should not be a problem as long as the maximum current output on the ports are not violated when the device is set to an output. (total from p0-p7 and p10-17 should not be greater than 80 mA in each total). Recommended limits are defined by junction temperature seen on section 6.3

    Thanks,

    -Bobby