construct a 3-8 decoder using a 2-4 decoder

Discussion in 'Homework Help' started by Ranjita ningthoujam, Nov 10, 2010.

  1. Ranjita ningthoujam

    Thread Starter New Member

    Nov 10, 2010
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    I want to know how to construct a 3-8 decoder using a 2-4 decoder
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,102
    2,156
    Hello,

    I moved your post from the other thread, as it is an other question.
    Now you have your own thread.

    Bertus
     
  3. Kermit2

    Senior Member

    Feb 5, 2010
    3,451
    774
    Look here

    http://www.play-hookey.com/digital/decoder_demux_four.html

    That show the simple arrangement of a 2 to 4 bit. By adding a third input stage and four more AND gates you get the 3 to 8 bit. Hint: some of the AND gates will now require 4 inputs max.

    Can you show the truth tables for a 2 to 4 and a 3 to 8?
     
  4. shteii01

    Senior Member

    Feb 19, 2010
    3,089
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