Page 77 - Computer science 868 Class 12
P. 77
The block diagram of a Decimal to Binary encoder is given below:
0
1 B
3
2
3 B
4 Decimal to 2
5 Binary Encoder
6 B 1
7
8 B 0
9
The truth table is drawn below:
Decimal number B 3 B 2 B 1 B 0
0 0 0 0 0
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
5 0 1 0 1
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
B , B , B and B represent the OR gates If the Octal numbers are represented by switches I to I then from the truth
2
0
1
9
0
3
table we can conclude that
B = I + I + I + I + I 9
3
7
0
5
1
B = I + I + I + I 7
1
6
3
2
B = I + I + I + I 7
2
4
5
6
B = I + I 9
3
8
The logic circuit diagram is as follows:
0
1
2
3
4
5
6
7
8
9
B 3 B 2 B 1 B 0
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Computer Hardware 75

