how it is possible????

Discussion in 'Homework Help' started by srimathy, Aug 27, 2006.

  1. srimathy

    Thread Starter New Member

    Aug 24, 2006
    2
    0
    Hi,
    A multiplexer has selectors and so it will have only one output.But a demultiplexer has only one input and how does it have many outputs?
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,906
    1,723
    A demultiplexer has selectors also. On a 74xx138 they are labeld A, B, and C. On this chip there are also three enables called G1, G2A, and G2B.
    G1 must be high and G2A and G2B must be low.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Look up the logic diagrams for a 74xx150 multiplexer and a 75xx154 demultiplexer to see the differences.
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    143
    The demultiplexer has a single data input, but n address inputs, therefore the number of outputs is 2^n. The address selects the output that will follow the data input.

    Dave
     
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