mux/demux chip suggestions needed

Discussion in 'The Projects Forum' started by mecha, Feb 20, 2013.

  1. mecha

    Thread Starter New Member

    Nov 10, 2012
    18
    0
    I have a couple of questions about serial/parallel mux/demux chips for microcontroller interface. I have two related tasks.

    1 - 24 channel led display. I am building a led based display with 24 leds, in 8 sets of three - imagine 8 traffic lights, on each light, only one of three on at any time. This presents (at least) two demux/buffering possibilities.
    A - simply sequence through 24 outputs with latches (one clock line and one data line. or
    B - eight outputs driving a second layer of three outputs each. A sounds easier, can anyone suggest a (dasiy-chainable) DIP chip option?

    2 - 12 channel IR sensor input. I've got 12 sensors that need to be polled by an analog input (or two). Again - any suggestions for appropriate chip(s)

    thanks!
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,018
    3,235
    1 - You might use an HEF-4794 or an HEF-4894 shift-and-store LED driver.

    2 - If the speed is not too high you could use two 4051s or one 4067.
     
    Last edited: Feb 20, 2013
  3. mecha

    Thread Starter New Member

    Nov 10, 2012
    18
    0
    That, sir, is exactly the information I needed. Thankyou very much for your very prompt response.
     
    Last edited: Feb 20, 2013
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