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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

Computer Engineering, Engineering

  • Category:- Computer Engineering
  • Reference No.:- M9543219

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