Bcd To 7 Segment Decoder 1h6j1o

You can easily draw this function table from 7-segment display. 7-segment display has 7 segments: a, b, c, d, e, f, e and g. When we have to display a digit then these segments are turned on and off accordingly. For example, we have to display digit 0 then segments a, b, c, d, e, f, g are turned on.

The following diagram shows digits 0 to 4 and shows which segments are turned on to display a particular decimal value.

The following diagram shows digits 5 to 9 and shows which segments are turned on to display a particular decimal value.

Function table from the above diagrams will be

From the above table you can see that segment a has logic 1 output for decimal values 0, 2, 3, 5, 6, 7, 8, 9. Segment b has logic 1 output for decimal values 0, 1, 2, 3, 4, 7, 8, 9. Similarly, you can find the output for other segments. The BCD to 7 segment decoder has 16 possible input combinations in which 0 to 9 are valid input combinations and remaining are don’t care input combinations. Inputs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Outputs

A

B

C

D

Seg. a

Seg. b

Seg. c

Seg. d

Seg. e

Seg. f

Seg. g

0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1

0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1

0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1

0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

1 0 1 1 0 1 1 1 1 1 × × × × × ×

1 1 1 1 1 0 0 1 1 1 × × × × × ×

1 1 0 1 1 1 1 1 1 1 × × × × × ×

1 0 1 1 0 1 1 0 1 1 × × × × × ×

1 0 1 0 0 0 1 0 1 0 × × × × × ×

1 0 0 0 1 1 1 0 1 1 × × × × × ×

0 0 1 1 1 1 1 0 1 1 × × × × × ×