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Monday, April 4, 2011

ASYNCHRONOUS DECADE COUNTER


    ASYNCHRONOUS DECADE COUNTER



AIM:                           

To implement and verify the truth table of an asynchronous decade counter.      

APPARATUS REQUIRED:

S.No
Name of the Apparatus
Range
Quantity
1.
Digital IC trainer kit

1
2.
JK Flip Flop
IC 7473
2
4.
NAND gate
IC 7400
1
5.
Connecting wires

As required

THEORY:

Asynchronous decade counter is also called as ripple counter.  In a ripple counter the flip flop output transition serves as a source for triggering other flip flops.  In other words the clock pulse inputs of all the flip flops are triggered not by the incoming pulses but rather by the transition that occurs in other flip flops.  The term asynchronous refers to the events that do not occur at the same time.   With respect to the counter operation, asynchronous means that the flip flop within the counter are not made to change states at exactly the same time, they do not because the clock pulses are not connected directly to the clock input of each flip flop in the counter.

PIN DIAGRAM OF IC 7473:










CIRCUIT DIAGRAM:


TRUTH TABLE:

S.No
CLOCK
PULSE
OUTPUT
D(MSB)
C
B
A(LSB)
1
-
0
0
0
0
2
1
0
0
0
1
3
2
0
0
1
0
4
3
0
0
1
1
5
4
0
1
0
0
6
5
0
1
0
1
7
6
0
1
1
0
8
7
0
1
1
1
9
8
1
0
0
0
10
9
1
0
1
0
11
10
0
0
0
0


PROCEDURE:

  1. Connections are given as per the circuit diagrams.
  2. Apply the input and verify the truth table of the counter.


RESULT:

The truth table of the Asynchronous decade counter was hence verified.

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