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TMUX1219: Recommended operating condition of Slew Rate for SEL pin

Koshi Ninomiya
Expert 4350 points
Part Number: TMUX1219
Other Parts Discussed in Thread: TMUX1248

Dear Team,

Please let me understand the recommended operating condition of Slew Rate for SEL pin, Login input, of the TMUX1219

For example, in case of the TMUX1248 datasheet, it has the recommended operating condition for SEL pin, Logic input.

However, the TMUX1219 datasheet does not have that. The SEL pin of the TMUX1219 is not shumitt-trigger input, right?
How slow is the slew rate of the login input signal to the SEL pin acceptable?

I look forward to your reply.
Thank you.

Best Regards,

Koshi Ninomiya

  • +1
    TI__Genius 13940 points

    Hello Koshi,

    Digital inputs switch immediately when the threshold is reached. The datasheet has no limit on the input transition time (which would imply a Schmitt-trigger input), but in any case, keeping the voltage between VIL and VIH for a long time will result in a high shoot-through current (see [FAQ] How does a slow or floating input affect a CMOS device?), so should be avoided.

    Also, There is a very small amount of hysteresis in the control inputs that mitigates most of the effects of slow switching. That being said, there are still some sensitive spots that may still allow for shoot through and oscillation in the logic control so it's best to avoid switching slowly and between the rails.

    Regards,

    Kameron