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Original question:

TMUX1208: Floating input pin (source Sx)

TMUX1219: Open SEL pin on TMUX1219

Cecilia Reyes
Genius 9920 points
Part Number: TMUX1219

Hi Team,

If I keep the SEL pin open, will that force a logic low output on my design? Are there any internal pulls or parasitic that could drive it in a different state?

Thanks

  • 0
    TI__Genius 9132 points

    Hi Cecilia,

    I have attached a snapshot from the datasheet which highlights what to do with unused selected lines.

    The TMUX1219 does does not have a pull-down resistor so you do not need to have an external resistor for the logic pins. However, if you never plan to toggle the device you could connect the SEL/EN pins to GND. This would ensure that the device doesn't toggle unless there is a shift in your GND voltage.

    Regards,

    Saminah