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What is the best part for 2:1 or 4:1 UART multiplexing?

Derek
Mastermind 9792 points
Other Parts Discussed in Thread: SN74HC151, SN74HC138, SN74LV4052A

Hello, I have a very simple application that I need help for. UART from an MSP430 (speed=230kHz, voltage=3.3V) and I want to route it to 2 or 4 different peripherals, switching between them. What is the best part to use for this application? I saw the analog multiplexers but it seems silly to use an analog part for a signal that is always digital. I guess I need a 4:1 and 1:4 in the same part. What do you recommend?

Thanks,

Derek

  • 0
    Guru 317150 points

    You could combine an 1:8 demultiplexer like the SN74HC138 and an 8:1 multiplexer like the SN74HC151.

    But if you look at the SN74HC151 logic diagram, you see that it uses transmission gates, which are analog switches. So you could just as well use an analog switch like the SN74LV4052A.

    Analog switches are commonly used for digital signals. If it is silly, and it works, then it is not silly.