need to design counter

Discussion in 'The Projects Forum' started by ahmedalsh40, Apr 24, 2011.

  1. ahmedalsh40

    Thread Starter New Member

    Dec 20, 2009
    14
    0
    need to design counter that count from 0 to 9
    when power on it begin from zero not from random number
    truth table is attached
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    Take a look at the links on this page from the EDUCYPEDIA:
    Counters & registers

    For starting at 0 you will need at add a power-on reset.

    Bertus
     
  3. ahmedalsh40

    Thread Starter New Member

    Dec 20, 2009
    14
    0
    For starting at 0 you will need at add a power-on reset.
    what is mean??
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    A "power on reset" is basicaly a RC nertwork on the reset lines of the counter.
    When powering on the circuit, the RC network delays the power to the reset.
    Take a look at the datasheets of some counter-chips wich pin is the reset.

    Bertus
     
  5. designnut

    Member

    Apr 21, 2011
    33
    1
    these counters have high input impedance, very versatile. have clearand set inputs. One doesn't design counters anymore.
     
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