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Hysteresis Comparator Methods

Discussion in 'Electronic Design' started by D from BC, Jan 3, 2007.

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  1. Jim Thompson

    Jim Thompson Guest

    Except that the circuit at the above URL is NOT a "D-latch" in the
    conventional sense of the word... a "D-latch" is edge-triggered, and
    the circuit at the URL is "re-settable" as long as "E" is high and
    thus is called a "transparent latch".

    ...Jim Thompson
     
  2. D from BC

    D from BC Guest

    Ooops..You're right..
    I'm looking at the wrong latch to review...
    I'll be reading...
    http://www.allaboutcircuits.com/vol_4/chpt_10/5.html

    Also...
    I've been writing D latch all this time...
    Saying positive edge triggered D type flip flop would be more
    descriptive.. Like the SN74AHC74.

    I hope I don't get bounced into the electronics.basic group for
    that one...:)

    D
     
  3. Jim Thompson

    Jim Thompson Guest

    No. Happens all the time... promulgated by lousy data sheet writers
    ;-)

    ...Jim Thompson
     
  4. John  Larkin

    John Larkin Guest

    It's not illegal. And in this case, simultaneous set and reset
    shouldn't happen. If it did happen, it would just extend the prop
    delay of the whole thing a little.

    Can't see why. Using edge-triggered flops just seems, to me, to add
    asymmetry and complexity to a simple concept.


    John
     
  5. Ken Smith

    Ken Smith Guest


    IIRC: There nothing stopping you from connecting a reference to pin 5.
    This makes the THR voltage fairly well known.
     
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