the johnson counter

Discussion in 'General Electronics Chat' started by reymund, Oct 6, 2008.

  1. reymund

    Thread Starter Member

    Sep 23, 2008
    23
    0
    hello,

    sir basically i know how does the 4017 johnson counter operates, but i want to know if this particular cmos can count form the msb to lsb and vice versa.. thank you.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    No, it just counts one way.

    If you want something like that to go both ways, look at using something like a 74154 demux/decoder driven by a binary up/down counter.
     
  3. reymund

    Thread Starter Member

    Sep 23, 2008
    23
    0
    sir if i apply the up down counter to the 74154 does it counts up and down automatically???... thanks for the info by the way.
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Check this counter here

    http://www.robotstore.com/download/12925.pdf

    It can count up/down depending on the voltage on a single pin. Also, you can choose binary/decade counting.

    For more counter chips search in google for up/down counter.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    A 74154 is a decoder/demultiplexer. It has no counting function at all.
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    I like this up down counter: CD 4029; BCD or binary ,jam inputs, single up/down control. If you connect carry out to the toggle input of a flip-flop[ CD4013 etc.] & connect Q out to up/down of 4029 it should count up & down if clock pulses are applied to clock input. A CD4515 decoder will give 16 outputs with binary in put.
     
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