77
TC74VHC157FT (INPUT : IC85)
T5CN5 (INPUT : IC91)
4A
VCC 16
4B
15
14
13
12
11
10
1
2
3
4
5
6
7
1Y
2A
2B
2Y
GND
4Y
8 3Y
9
3A
3B
1A
1B
SELECT
ST
A
S G
B A
Y B
A
Y
B A
Y BY