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SN74AUC1G66: Internal pull-down?

Ian Wang
Mastermind 30050 points
Part Number: SN74AUC1G66
Other Parts Discussed in Thread: TS5A3167

Hi Sir,

I want to double confirm if SN74AUC1G66 have internal pull LOW to GND in switch OFF status?

I means if trace from IN to OUT if have internal PULL LOW, thanks.

  • 0
    TI__Expert 5660 points

    Hi Ian,

    When the switch is OFF (control input is LOW), the switch will be in the high-impedance state. Neither terminal (A or B) will be internally pulled to GND. 

    What is your application? We have many options for 1:1 switches if you are interested in a new device. However, our switches are designed to have high-impedance signal path when the switch is disabled.

    Let me know if this helps.

    Best regards,
    Kate

  • 0 in reply to Kate Dickson
    TI__Mastermind 30050 points

    Hi Kate,

    This application is block DC bias(around 1~1.8V) in audio signal path.

    Do we have better solution for kind of application?

    Thanks, Ian.

  • 0 in reply to Ian Wang
    TI__Expert 5660 points

    Hi Ian,

    All of our analog 1:1 switches will be in the high-impedance state when disabled by the control logic. Will this be compatible with your system?

    There are quite a few options for single channel 1:1 switches. Check out this link to the parametric search tool to sort by parameters and features.

    A feature you may be interested in is powered-off protection, which ensures that the switch is in the high-impedance state when there is no power supplied to the device. Take a look at TS5A3167, which can be used in audio applications. TS5A3167 has lower Ron, lower leakage current, and includes the powered-off protection feature. The DBV (SOT23) package is pin-to-pin compatible (but the control pin logic is opposite - the switch is ON when control is LOW).

    Let me know what you think about TS5A3167.

    Best regards,
    Kate