Harman Kardon DVD 47 Service Manual page 53

D V D 4 7
SN74LVC157A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
SCAS292G – JANUARY 1993 – REVISED OCTOBER 1998
†
logic symbol
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1A
1B
2A
2B
3A
3B
4A
4B
G
A/B
15
G EN
1
A/B G1
2
1A
1
3
1B 1
5
2A
6
2B
11
3A
10
3B
14
4A
13
4B
2
3
5
6
11
10
14
13
15
1
4
MUX
1Y
7
2Y
9
3Y
12
4Y
53
harman/kardon
4
1Y
7
2Y
9
3Y
12
4Y