Using a switch to clock digital circuit

Discussion in 'Homework Help' started by colincraig1, Nov 5, 2005.

  1. colincraig1

    Thread Starter New Member

    Nov 5, 2005
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    Help needed urgently!!

    Briefly discuss the effect of using a switch to clock a digital circuit & sketch a circuit diagram to overcome this problem

    &


    Discuss the key characteristics of the 7476 & 74hct112 logic families
     
  2. Dheejay

    New Member

    Nov 6, 2006
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    exact same question, help needed. seen u couldnt help this person back in 2005 surely someone can help now!
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    You'll need a debounce citcuit to use the switch and get a good clock. An R-S latch works very well for that. Look at a 74xx279 for the function, anthough a pair of NAND gates will work as well.

    You will find a lot of difference between original TTL and CMOS HCT logic. Datasheets should explicitly spell out those differences.
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Motorola makes a Switch Debounce IC part number MC14490. It is actually capable of debouncing 6 switch with the single IC.

    hgmjr
     
  5. robinboss

    New Member

    Jul 22, 2005
    3
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    What is debouncing?
     
  6. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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