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TMUX1072: Impedance Question

McKenna Strambi
Intellectual 1410 points
Part Number: TMUX1072

Tool/software:

Hi expert, 

Customer is looking at a window detector IC, their root issue is that their eUSB pins are exposed to 5.5V charging voltage on removable cable header. Their eUSB pins are not tolerant to 5.5V, and need a way to prevent this case; one option is to use a part like TMUX1072 to pass eUSB signals though, keep this part normally off. 

A couple questions with this:

  • What is differential and single ended impedance of this device? We see it is good up to 1.2G, also calls for use in LVDS which is differential impedance controlled to ~90 ohms; Is there another device we should consider for eUSB signal switching?

Thanks!

McKenna

  • 0
    TI__Genius 17665 points

    Hello McKenna,

    We didn't test or specify differential impedance for this part, but single ended one can be up to 18Ω. 

    For eUSB I can recommend the TMUXHS221, but it doesn't have powered off protection like the TMUX1072.

    To clarify, does the customer need the mux to isolate the 5.5V from the exposed pins? Meaning does it need to handle a 5.5V signal on the I/Os while its off? If that's the case, then the TMUX1072 is the best option here. 

    Thanks,

    Nir