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 Apparatus required:-
The following electronics components are required.
·         NAND Gate (IC-7400)
·         AND Gate (IC-7411)
·         OR Gate (IC-7432)
·         EX-OR Gate (IC-7486)
·         NOT Gate (IC-7404)
·         JK Flip-Flop (IC-7476)
·         Digital IC Trainer KIT
·         Connecting wires
Description:-
A counter is a register capable of counting number of clock pulse arriving at its clock input. Counter represents the number of clock pulses arrived. An up/down counter is one that is capable of progressing in increasing order or decreasing order through a certain sequence. An up/down counter is also called bidirectional counter. Usually up/down operation of the counter is controlled by up/down signal. When this signal is high counter goes through up sequence and when up/down signal is low counter follows reverse sequence.
K-Map:-

State Diagram:-

Logic Diagram:-
Characteristics Table:
Q
Qt+1
J
K
0
0
0
X
0
1
1
X
1
0
X
1
1
1
X
0





Truth-Table:
Input
Up/Down
Present State
QA   QB   QC
Next State
QA+1  Q B+1  QC+1
A
JA     KA
B
JB     KB
C
JC     KC
0
0       0        0
1         1         1
1        X
1        X
1       X
0
1       1       1
1         1         0
X        0
X        0
X        1
0
1       1       0
1         0         1
X        0
X        1
1        X
0
1       0       1
1         0         0
X        0
0        X
X        1
0
1       0       0
0         1         1
X        1
1        X
1        X
0
0       1       1
0         1         0
0        X
X        0
X        1
0
0       1       0
0         0         1
0        X
X        1
1        X
0
0       0       1
0         0         0
0         X
0        X
X        1
1
0       0       0
0         0         1
0        X
0        X
1        X
1
0       0       1
0         1         0
0        X
1        X
X        1
1
0       1       0
0         1         1
0        X
X        0
1        X
1
0       1       1
1         0         0
1        X
X        1
X        1
1
1       0       0
1         0         1
X        0
0        X
1        X
1
1       0       1
1         1         0
X        0
1        X
X        1
1
1       1       0
1         1         1
X        0
X        0
1        X
1
1       1       1
0         0         0
X        1
X        1
X        1
Conclusion: - All the output verified the result of Truth Table.
Precaution in lab:-
·         All the connections should be tight and proper.
·         Handle the ICs carefully.
·         Check the connection once again before Switching on the Digital Trainer KIT.
·         Switch of the Trainer Kit after performing the Experiment.

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