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Electronics Looking for specific logic chip

Discussion in 'Modding' started by c.cam108, 7 Nov 2008.

  1. c.cam108

    c.cam108 Member

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    Hi

    I'm looking for a specific logic chip but I can't find it anywhere.

    I need it to take a 4-bit input and select one of 16 or however many outputs depending on the input.

    Ie, IN: 1001 output 9 pulled high

    IN: 0010 output 2 pulled high

    Does this exist? I'm sure it does but I think I'm just looking for the wrong name.

    Thanks

    Colin C
     
  2. Dreamslacker

    Dreamslacker New Member

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    They are called BCD to Decimal decoders. Try googling to find one that's available/ affordable.

    An example of such a chip would be the HCC4028/ HCF4028; another would be the 74HC42. These have 4 inputs (BCD) and select 1 of 10 output pins based on the binary code presented.


    edit: I forgot to state that the inputs are parallel. ie. you present the BCD over 4 pins. It's not serial logic where you send the code via a series of pulses over a single wire.
     
  3. cpemma

    cpemma Ecky thump

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    Also look at 4514B, 4-Bit Latch/4-to-16 Line Decoder with Output Hi.

    I have one waiting to be a 16-LED Knight Rider. :lol:

    1-of-8 line decoder chips (eg, 74HC138 or 74HCT138) can be chained as in Bill Bowden's KR.
     

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