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Help: Selecting the right multiplexer för digital signals (input and output)

Marko S
Intellectual 670 points
Other Parts Discussed in Thread: SN74CB3Q3245

Hello

I need to be able to select/switch about 20 digital 3.3V signals från two sources into one destination. Some of the signals are inputs and the other are outputs.

Should I select an analog multiplexer or a digital multiplexer/demultiplexer?

The maximum signal frequency is max 50 MHz.

  • 0
    Guru 22270 points

    You can look at the selector guides for information. http://www.ti.com/lsds/ti/switches-multiplexers/analog-switch-multiplexer-less-product.page

    If it is something that the CD4052 or CD4053 can't handle (25 & 30 MHz) and without knowing your actual application, LAN, Video, USB, etc., you have a lot of choices.  You can narrow it down by using the selector on the product page.

    As far as analog or digital, that would depend on the signal.  I generally go for analog because for most of my applications, they can handle my digital requirements and that reduces inventory.

    Thanks,

  • 0 in reply to Greenja
    Intellectual 670 points

    Hello again

    The signals is an RMII interface connected to a PHY.

  • 0 in reply to Marko S
    Guru 25210 points

    I would take a look at a digital bus switch, something along the lines of a SN74CB3Q3245.

    If you need to translate between voltage nodes, search for "Translating Bus Switch" on the TI main web page.