1-bit, 8 input multiplexer

Discussion in 'The Projects Forum' started by enjoiful, Jun 20, 2008.

  1. enjoiful

    Thread Starter New Member

    Jun 20, 2008
    2
    0
    I am looking for an IC that uses at least a 1-bit select line to output 8 lines.

    I'm interfacing with CMOS circuits so I would like to keep the multiplexer in the same logic family, but I am flexible if there is a better alternative.

    Essentially I need a select line that chooses between 2 input lines that are 8 bits each.

    Anyone have any suggestions?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    What you seek is called an "8 bit 1 of 2 multiplexer" or "8 bit 1 of 2 switch." I don't know of any CMOS versions. (Of course, the universe is chock-full of things I don't know about.)
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Take a look at a Dallas/Maxim MAX4890E or MAX4892E.

    They're designed for 1000-base T LAN switches, but they should do the trick for you.
    http://para.maxim-ic.com/en/search.mvp?fam=swmux_mid&tree=master
    Once the page opens, select "2:1 Mux" under "Configuration", and 8 bit under Chan.

    If you can't deal with that package, then you could use three CD4053B IC's; they're triple 2:1 analog muxes. Tie the unused inputs from the leftover channel to Vdd or Vss with resistors unless you like pulling your hair out trying to figure out where the doggone noise is coming from. Floating inputs on analog muxes will give you just as big of a headache as floating digital CMOS inputs.
     
    Last edited: Jun 20, 2008
  4. enjoiful

    Thread Starter New Member

    Jun 20, 2008
    2
    0
    Thanks SgtWookie, both of those options are great. That Maxim website was really cool in that allows you to custom build parts.

    I think I am going to stick with the CD4053 though. A little extra breadboarding never hurt anyone.
     
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