Onkyo TX-SR502 Service Manual page 13

IC BLOCK DIAGRAM AND TERMINAL DESCRIPTIONS-3
Q291: BU4053B (Triple 2- channel analog multiplexer/ demultiplexer)
BLOCK DIAGRAM
VDD (16)
INH (6)
A (11)
B (10)
C (9)
VSS (8)
VEE (7)
X0 (12)
X1 (13)
Y0 (2)
Y1 (1)
Z0 (5)
Z1 (3)
TRUTH TABLE
INH
L
L
L
L
L
L
L
L
H
X:lrrelevant
BINARY TO 1of 2
LEVEL
CONVERTER
DECODER WITH INH
A B C ON SWITCH
L L L X Y
0 0
H L L X Y
1 0
L H L X Y
0 1
H H L X Y
1 1
L L H X Y
0 0
H L H X Y
1 0
L H H X Y
0 1
H H H X Y
1 1
X X X NONE
(14) X
(15) Y
(4) Z
Z
0
Z
0
Z
0
Z
0
Z
1
Z
1
Z
1
Z
1
TX-SR502/E/8250/HT-R520