Connection Diagrams (Continued)
Pin Assignment for
DIP and SOIC Package
Top View
MM74C923
Truth Tables
(Pins 0 through 11)
0
1
2
3
4
5
6
7
8
9
10
11
Switch
Position
Y1,X1 Y1,X2 Y1,X3 Y1,X4 Y2,X1 Y2,X2 Y2,X3 Y2,X4 Y3,X1 Y3,X2 Y3,X3 Y3,X4
D
A
T
A
B
C
D
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
1
0
0
0
0
0
1
0
0
1
0
1
0
0
0
1
1
0
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
0
0
1
0
1
0
1
1
0
1
0
A
O
U
T
E (Note 1)
(Pins 12 through 19)
12
13
14
15
16
17
18
19
Switch
Position
Y4,X1 Y4,X2 Y4,X3 Y4,X4 Y5(Note 1), Y5 (Note 1), Y5 (Note 1), Y5 (Note 1),
X1
X2
X3
X4
D
A
T
A
0
0
1
1
0
1
0
1
1
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
0
1
B
A
O
U
T
C
D
E (Note 1)
Note 1: Omit for MM74C922
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