02 비교기 q 2비트 비교기 입력 출력 X≠Y X>Y X Y X=Y X 1 X 2 Y 1 Y 2 F 1 F 2 F 3 F 4 00 01 10 11 1 0 0 0 0 1 0 1 1 1 1 0 0 0 1 0 0 0 1 1 1 0 0 0 1 0 0 00 01 10 11 - 17 - X<Y
02 비교기 입력 A 3, B 3 A 2, B 2 A 1, B 1 A 0, B 0 A 3>B 3 A 3<B 3 A 3=B 3 A 3=B 3 A 3=B 3 A 3=B 3 X X A 2>B 2 A 2<B 2 A 2=B 2 A 2=B 2 A 2=B 2 X X A 1>B 1 A 1<B 1 A 1=B 1 A 1=B 1 A 1=B 1 X X X A 0>B 0 A 0<B 0 A 0=B 0 A 0=B 0 출력 AGBO ALBO AEBO AGBI ALBI AEBI A>B A<B A=B X X X 1 0 0 X X X 0 1 0 1 0 0 0 1 0 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 4비트 비교기 IC 7485 진리표 - 21 -
03 디코더 4. 4× 16 디코더 D C B A 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 Y 15 Y 14 Y 13 Y 12 Y 11 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 Y 10 Y 9 Y 8 Y 7 Y 6 Y 5 Y 4 Y 3 Y 2 Y 1 Y 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 4× 16 디코더 진리표 - 34 -
03 디코더 4. 4× 16 디코더 D C B A 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 Y 15 Y 14 Y 13 Y 12 Y 11 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 Y 10 Y 9 Y 8 Y 7 Y 6 Y 5 Y 4 Y 3 Y 2 Y 1 Y 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 4× 16 디코더 진리표 - 37 -
03 디코더 7 -세그먼트 디코더 진리표 입력 출력 D C B A 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 1 0 0 0 x x x 0 0 0 1 1 0 0 0 x x x - 43 - 0 0 1 0 0 0 0 x x x 0 1 0 0 1 x x x 0 1 1 1 0 0 0 1 0 0 x x x 1 1 0 0 0 1 0 0 x x x
03 디코더 7447 진리표 0 1 2 decimal or function 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 1 1 1 X 3 4 입력 출력 1 X X X X D 0 0 0 0 1 1 1 1 X C 0 0 0 0 1 1 1 1 X B 0 0 1 1 X A 0 1 0 1 X 1 1 1 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 0 1 0 0 1 1 0 1 0 1 1 0 1 1 1 0 0 0 1 1 0 0 0 0 1 1 1 0 0 0 1 1 1 1 0 X X X 1 0 0 0 0 5 6 7 8 - 47 - 9 10 11 12 13 14 15
04 인코더 6. 10진-BCD 우선순위 인코더 입력 출력 I 9 I 8 I 7 I 6 I 5 I 4 I 3 I 2 I 1 1 1 1 1 0 X 1 1 0 1 1 1 1 0 X X 1 1 0 0 1 1 1 0 X X X 1 0 1 1 1 0 X X X 1 0 0 1 1 1 0 X X X 1 0 0 0 1 0 X X X X 0 1 1 1 1 1 진리표 - 60 -