Page 80 - Computer science 868 Class 12
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The truth table of a Binary to Decimal encoder having input lines A , A , A and A and 10 outputs represented by AND
2
3
0
1
gates D to D is shown below.
0
9
A 3 A 2 A 1 A 0 D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8 D 9
0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 1 0 1 0 0 0 0 0 0 0 0
0 0 1 0 0 0 1 0 0 0 0 0 0 0
0 0 1 1 0 0 0 1 0 0 0 0 0 0
0 1 0 0 0 0 0 0 1 0 0 0 0 0
0 1 0 1 0 0 0 0 0 1 0 0 0 0
0 1 1 0 0 0 0 0 0 0 1 0 0 0
0 1 1 1 0 0 0 0 0 0 0 1 0 0
1 0 0 0 0 0 0 0 0 0 0 0 1 0
1 0 0 1 0 0 0 0 0 0 0 0 0 1
The following is the logic circuit diagram of a Binary to Decimal Encoder:
A 3 A 2 A 1 A 0
D 0
D 1
D 2
D 3
D 4
D 5
D 6
D 7
D 8
D 9
Working Principle of Binary to Decimal Decoder:
If we take A = 1, A = 0 A = 0 and A = 1 as input the output across the eight gates are as follows:
0
3
2
1
D = A '.A '.A '.A ' is 0
2
3
0
1
0
D = A '.A '.A '.A is 0
1
0
1
3
2
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