Please read-circuit lab practical counters.

Discussion in 'General Electronics Chat' started by gamelive96, Dec 31, 2015.

  1. gamelive96

    Thread Starter New Member

    Dec 31, 2015
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    i have a doubt.in practical experiments,how do we connect preset and clear to ic chips in a bread board.from where to where..if in ic 7473 synchronous counters
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    Your link is defective.

    If you are not using a particular input, then tie it to whichever logic level renders it inactive. Do NOT leave it unconnected!
     
  3. gamelive96

    Thread Starter New Member

    Dec 31, 2015
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    i didnt gt it
     
  4. dl324

    Distinguished Member

    Mar 30, 2015
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    7473 is a J-K flip flop with low active clear, not a counter. You should tie it HIGH through a pull up resistor so you retain the ability to reset.
     
  5. dl324

    Distinguished Member

    Mar 30, 2015
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    Unconnected inputs will be at a voltage that is neither HIGH or LOW that could cause unpredictable operation. Tying them to an appropriate voltage prevents that.
     
  6. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    If you are connecting a group of 7473 flipflops toform a multi-bit counter, then all of the presets should be tied together and all of the clears should be tied together. The group reset input will clear all counter stages, and the preset input will set all stages to logic 1.

    ak
     
  7. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  8. dl324

    Distinguished Member

    Mar 30, 2015
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    And then they act indignant when you suggest Googling for information before asking for help...
     
  9. hp1729

    Well-Known Member

    Nov 23, 2015
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    Generally 74xxx series chips asynchronous (Set and Clear) are active low and need a pullup resistor to VCC if they are not used. 1K to 10K ohms is good. Not much of a need to calculate much. 4xxx series CMOS are usually active high and need to be grounded or a pull down resistor to ground. 10K to 100K ohms.
     
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