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PCA9406 - Question of Partial Power Down

Hiroshi Katsunaga
Mastermind 6480 points
Other Parts Discussed in Thread: TCA9406

Hello,

My customer has some questions about PCA9406.

[Q1] Please refer to an attached file.

7181.TCA9406_Questions.pdf

[Q2] Please refer to an attached file.

 

Regards,

Hiroshi Katsunaga

  • 0
    TI__Mastermind 30280 points

    Katsunaga-san,

    First of all, I believe you mean TCA9406. TI does not offer a PCA9406 device.

    [Q1] Yes, the device can support your proposed circuit. See page 9 of the datasheet: "One advantage of the TCA9406 translator is that either power supply can be ramped up first. Another advantage is that either power supply can be set to 0 V, and the outputs are in high-impedance state."

    [Q2] Footnote 3 is only applicable when both VCCA and VCCB are powered. I would suggest following the suggested design for the OE pin, also from page 9 of the datasheet: "A pulldown resistor tying OE to ground should be used to ensure that bus contention, excessive currents, or oscillations do not occur during power up and power down"

     

    Thanks,

    Brian

  • 0 in reply to Brian Berner
    Mastermind 6480 points

    Hi Brian-san,

    Thank you for answering my question.

    I'm sorry, my questions meant TCA9406.

    I understood your comment.

     

    Best Regards,

    Hiroshi Katsunaga