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MM74C923N Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # MM74C923N
Description  16-Key Encoder 20-Key Encoder
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

MM74C923N Datasheet(HTML) 2 Page - Fairchild Semiconductor

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Connection Diagrams (Continued)
Pin Assignment for
DIP and SOIC Package
Top View
MM74C923
Truth Tables
(Pins 0 through 11)
(Pins 12 through 19)
Note 1: Omit for MM74C922
Switch
Position
0
1234
5
6
789
10
11
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
A
0
10101
0
1010
1
T
B
0
01100
1
1001
1
A
C
0
00011
1
1000
0
O
D
0
00000
0
0111
1
UE (Note 1)
0
00000
0
0000
0
T
Switch
Position
12
13
14
15
16
17
18
19
Y4,X1
Y4,X2
Y4,X3
Y4,X4
Y5(Note 1),
X1
Y5 (Note 1),
X2
Y5 (Note 1),
X3
Y5 (Note 1),
X4
D
A
A
01
01
0
1
0
1
T
B
00
11
0
0
1
1
A
C
11
11
0
0
0
0
O
D
11
11
0
0
0
0
UE (Note 1)
0
0
0
0
1
1
1
1
T


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