Bose T1 ToneMatch - Troubleshooting Guide

57
IC Diagrams
PIN DESCRIPTION
NOITCNUF DNA EMANLOBMYS.ON NIP
A3 ,2 ,1
0
to A
2
address inputs
4, 5
E
1
, E
2
enable inputs (active LOW)
E6
3
enable input (active HIGH)
)V 0( dnuorgDNG8
15, 14, 13, 12, 11, 10, 9, 7
Y
0
to Y
7
outputs (active LOW)
V61
CC
positive supply voltage
Pin configuration Logic symbol
handbook, halfpage
MLB312
A
0
A
1
A
2
1
2
3
15
13
11
7
9
10
12
14
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
Y
7
4
5
6
E
1
E
2
E
3
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
STUPTUOSTUPNI
E
1
E
2
E
3
A
0
A
1
A
2
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
Y
7
H
X
X
X
H
X
X
X
L
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
L
L
L
L
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
74HC138, 3-to-8 Line Decoder