Help ! I need a large decoder ( 7 to 128 )

Discussion in 'The Projects Forum' started by natrix, Apr 27, 2009.

  1. natrix

    Thread Starter New Member

    Mar 24, 2009
    7
    0
    Hello ;
    I have a big project that has a 7 input lines ( binary value ) and the output is the line which correspondes to this value ,
    i.e if the input is 0000010 the line number 2 will be high (1) and so on .

    Can anyone help .

    Please :)
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Do you really want to decode the 7 bits to 128 single lines?
    In what do you want to make it Cmos or TTL?

    Greetings,
    Bertus
     
  3. natrix

    Thread Starter New Member

    Mar 24, 2009
    7
    0
    Yes I want a 7 to 128 decoder or any thing else can do the same process

    and I want a TTL decoder


    thanks for passing by :)
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    You can use a couple of 74154's.

    Here ia an example:

    [​IMG]

    Pins 18,19 and 20 of the High bits decoder should go to ground.

    Greetings,
    Bertus
     
    Last edited: Apr 27, 2009
  5. natrix

    Thread Starter New Member

    Mar 24, 2009
    7
    0
    thanks alot
    I'm going to try it
    but I wish if someone has an easier ideas or something .
     
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