Harman Kardon AVR525 Service Manual page 135

AVR525
8-channel analog multiplexer /
demultiplexer
BU4051BC / BU4051BCF / BU4051BCFV
The BU4051BC, BU4051BCF and BU4051BCFV are analog multiplexers / demultiplexers which use three-input digi-
tal signals for control via an 8-channel analog switch.
These products feature high on / off output voltage ratio and low crosstalk between analog switches.
•
Block diagram
•
Logic circuit diagram
V (16)
DD
INH (6)
A (11)
BINARY TO 1 of 8
LEVEL
B (10)
CONVERTER DECODER WITH INHIBIT
C (9)
V (8)
SS
V (7)
EE
X (13)
0
X (14)
1
X (15)
2
X (12)
3
X (1)
4
X (5)
5
X (2)
6
X (4)
7
X 1
4
CHANNEL
IN / OUT
X
2
6
X
COMMON
X
X 3 6
OUT / IN
X
X
4
7
X
7
CHANNEL
IN / OUT
X
5
X
5
5
INH
INH 6
V
EE
C
V 7
EE
V 8
SS
X
(3) COMMON
V
16
DD
15 X
2
4
X
2
14 X
1
CHANNEL
X
1
IN / OUT
13 X
0
X
0
X
3
12 X
3
A
A
11
B
10 B
9
C
•
Truth table
INH A
L L
L H
L L
L H
L L
L H
L L
L H
H X
X: Irrelevant
135
harman/kardon
B C ON SWITCH
L L X
0
L L X
1
H L X
2
H L X
3
L H X
4
L H X
5
H H X
6
H H X
7
X X NONE