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TCA9617A: power sequence

Shu-Cheng LIN
Guru 11785 points
Other Parts Discussed in Thread: TCA9617A, TCA9617B

Hi Sirs,

Sorry to bother you.

As title, does TCA9617A have any power sequence limitation need follow?

Because i saw old datasheet have show VCCB and VCCA can be applied in any sequence at power up.

But new datasheet didn't.

Could you help confirm it?

Thanks!!

  • 0
    TI__Guru 62920 points
    Hello Shu-Cheng,

    If VCCA is powered up first, then the state of the I/O pins would be indeterminate until VCCB ramps up. After both rails are active, though, the device should function normally regardless of the power-up sequence.

    Please note that an updated version of this device is available (TCA9617B) which features powered-off high-impedance IOs.

    If you have any further questions please let us know.

    Regards,
    Max