Negative Twisted Ring Counter

Discussion in 'The Projects Forum' started by MrL, Dec 14, 2009.

  1. MrL

    Thread Starter Member

    Oct 21, 2009
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    0
    Hi,

    This is a very small part of my project. A typical 4-bit twisted ring counter gives four positive-going strobes, as shown below in the right hand diagram:

    http://en.wikipedia.org/wiki/Ring_counter

    I was just wondering what the waveform would be from a circuit built to give four negative-going strobes?

    Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, with TTL and CMOS level logic, you basically have two choices: 1 or 0. There IS no -1.
    There are also tri-state devices, which have high impedance mode; primarily used for connections to data buses.
     
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Put inverters on outputs. Sounds like a Knight-rider project.
     
  4. loosewire

    AAC Fanatic!

    Apr 25, 2008
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    I'm having trouble In your post If you are pro or con of our beloved Sgt.
     
  5. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Loosewire, to whos post are you referring? The Sgt. is the best.
     
  6. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Use the /Q (not Q) outputs of the flip-flops. Or, use the Q outputs in reverse order.
     
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