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

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

  1. Ranjita ningthoujam

    Ranjita ningthoujam Thread Starter New Member

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

    bertus Administrator Staff Member

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    Hello,

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

    Bertus
  3. Kermit2

    Kermit2 Well-Known Member

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    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

    shteii01 Well-Known Member

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