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Name the 7400 series TTL chip which is a priority encoder. Write its truth table. Ans.
Available IC in 74 series is 74147 that is a priority encoder. Such IC has active low inputs and outputs. The significance of the word priority can be realized from the truth table. For example if 2 and 5 are low, the output will be consequent to 5 that has a higher priority than 2 that is the highest numbered input has priority over lower numbered inputs.
Truth table of 74147
Active low decimal input's Active low BCD outputs 1 2 3 4 5 6 7 8 9 D C B A 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 0 X 0 1 1 1 1 1 1 1 1 1 0 1 X X 0 1 1 1 1 1 1 1 1 0 0 X X X 0 1 1 1 1 1 1 0 1 1 X X X X 0 1 1 1 1 1 0 1 0 X X X X 1 0 1 1 1 1 0 0 1 X X X X 1 1 0 1 1 1 0 0 0 X X X X X X X 0 1 0 1 1 1 X X X X X X X X 0 0 1 1 0
Active low decimal input's Active low BCD
outputs
1
2
3
4
5
6
7
8
9
D
C
B
A
0
X
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