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SN74CBTLV16292: Muxing 1.8V signals with SN74CBTLV16292

Peter Schmuckal
Intellectual 320 points
Part Number: SN74CBTLV16292

Tool/software:

Our application requires muxing 12ch high speed(ish) (~10MHz) 1.8V digital signals with a 2:1 mux.

I see the SN74CBTLV16292 mux if powered at > 2.3V, should be able to mux 1.8V digital logic signals. However, it is not well characterized for this application, and there are no Ron curves in the datasheet.

Questions:

- The datasheet only characterizes Ron for Vi=1.7V and Vcc=2.5V. What is Ron at Vi=1.7V & Vcc=3.3V and is this recommended or not?
- Can you share Ron curves for Vcc=2.5V & Vcc=3.3V?
- How does using 1.8V signals affect Tpd? (A to B), and also bandwidth?
- In general, would it be better to use Vcc=2.5V or 3.3V for muxing 1.8V signals?
- The control input logic levels are not an issue.

Thanks

  • 0
    TI__Genius 10552 points

    Hi Peter,

    Thanks for reaching. So far starters we unfortunately do not have Ron curves for this older device. I can tell you though that Ron remains generally flat across supply range due to this device architecture. This app note provides more information as well as a general Ron plot reference for this device family. Using 1.8V signals should not affect bandwidth and have minimal impact on Tpd as well. In general, I would say that using a higher Vcc for 1.8V signals would provide a better Ron spec here. 

    Let me know if this helps!

    Regards,

    Alex