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TMUX154E: Cascaded application discussion

Evan Wang
Genius 9340 points
Part Number: TMUX154E

Hi TI expert,

We would like to implement the below idea based on TMUX154E.

May I know whether you have any concerns about it?

And we could not find the VOH/VOL of the output side.

So it's hard to confirm whether it will work or not.

Could you kindly share your comment with me?

Thank you.

  • 0
    TI__Expert 3515 points

    Hi Chia,

    Yes, this cascaded configuration will work but it will reduce the bandwidth performance of the devices. The TMUX154E, and all devices in the analog multiplexer portfolio, are passive switches and multiplexers meaning that they do not drive/redrive the signal. They simply pass whatever signal is present on the I/O pin less the minimal attenuation from RON. Are you looking for an active, buffered multiplexer that will redrive the signal?

    The VIH/VIL levels listed are for the logic pins (SEL & /EN).

    Thanks,
    Tyler

  • 0 in reply to Tyler McGuire
    TI__Genius 9340 points

    Hi Tyler,

    Just want to use it as a mux.

    So actually we do not have a certain range for VOH/VOL of pin A/B?

    I would like to confirm the VIL/VIH of those I/O input, should I assume it is really close to the VCC since the current(mA/uA) is extremely small?

    Thank you. 

  • 0 in reply to Evan Wang
    TI__Expert 3515 points

    Hi Chia,

    No, there is not a VOH/VOL for pins A or B because they do not have drive capability. This is a bidirectional, analog multiplexer. When a channel is selected it can essentially be modeled as a wire. Pins A0/1, A, B0/1, and B do not have VIH, VIL, VOH, or VOL values. The VIH and VIL values are correct for the SEL and EN pins. Here is a TI precision labs video with more information on analog switches and multiplexers: What are switches & multiplexers?

    Thanks,
    Tyler