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A BCD decoder will have how many rows in truth table?

A BCD decoder will have how many rows in truth table? Correct Answer 10

A BCD decoder will have 10 rows in the truth table.

Explanation:

  • In BCD to 7-segment Decoder, the outputs of a digital circuit are often displayed as decimal digits.
  • BCD to 7-segment decoder is a combinational circuit that converts a BCD number into signals that are required for the display of the value of that number on a seven-segment display.
  • The number of input lines is 4. 

 

Notes:

  • The decoder outputs are (a, b, c, d, e, f, g)
  • For the display of the digit 0, segments a, b, c, d, e, f will be lit as shown above.


A truth table can be formed for all digits from 0 to 9.

Digit

D

C

B

A

a

b

c

d

c

f

g

Hex equivalent

0

0

0

0

0

1

1

1

1

1

1

0

 7E

1

0

0

0

1

0

1

1

0

0

0

0

 30

2

0

0

1

0

1

1

0

1

1

0

1

6D

3

0

0

1

1

1

1

1

1

0

0

1

 79

4

0

1

0

0

0

1

1

0

0

1

1

 33

5

0

1

0

1

1

0

1

1

0

1

1

 5B

6

0

1

1

0

1

0

1

1

1

1

1

 5 F

7

0

1

1

1

1

1

1

0

0

0

0

 70

8

1

0

0

0

1

1

1

1

1

1

1

 7F

9

1

0

0

1

1

1

1

1

0

1

1

7B

 

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