Casio QT-6000 Service Manual page 94

2. ALVCH16245 (IC8)
1DIR 1
1B1
2
1B2 3
GND 4
1B3 5
1B4
6
V 7
CC
1B5 8
1B6
9
GND 10
1B7 11
1B8 12
2B1 13
2B2 14
GND 15
2B3
16
2B4 17
V 18
CC
2B5 19
2B6 20
GND 21
2B7 22
2B8 23
2DIR 24
terminal assignments
1 2
A 1DIR NC
B 1B2 1B1
C 1B4 1B3
D 1B6 1B5
E 1B8 1B7
F 2B1 2B2
G 2B3 2B4
H 2B5 2B6
J 2B7 2B8
K 2DIR NC
NC No internal connection
logic diagram (positive logic)
48 1OE
1A1 1DIR
47
46 1A2
45 GND
44 1A3
1A4
43
42 V
CC
41 1A5
1A6
40
39 GND
38 1A7
37 1A8
36 2A1
35 2A2
34 GND
2A3
33
32 2A4
31 V
CC
30 2A5
29 2A6
28 GND
27 2A7
26 2A8
25 2OE
3 4
NC NC
GND GND
V CC V CC
GND GND
GND GND
V CC V CC
GND GND
NC NC
1
47
1A1
To Seven Other Channels
5 6
NC 1OE
1A1 1A2
1A3 1A4
1A5 1A6
1A7 1A8
2A2 2A1
2A4 2A3
2A6 2A5
2A8 2A7
NC 2OE
— 92 —
48
1OE
2
1B1
FUNCTION TABLE
(each 8-bit section)
INPUTS
OPERATION OPERATION
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation