MM74C923N Fairchild Semiconductor, MM74C923N Datasheet - Page 2

• Manufacturer Part Number: MM74C923N
• Description: IC ENCODER 20-KEY 20-DIP
• Manufacturer: Fairchild Semiconductor
• Series: 74Cr
• Type: 20-Key Encoderr

Specifications of MM74C923N

• Circuit: 1 x 9:4
• Independent Circuits: 1
• Current - Output High, Low: 15mA, 16mA
• Voltage Supply Source: Single Supply
• Voltage - Supply: 3 V ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Product: Decoders, Encoders, Multiplexers & Demultiplexers
• Logic Family: 74C
• Number Of Bits: 4
• Number Of Lines (input / Output): 8.0 / 5.0
• Propagation Delay Time: 150 ns at 5 V, 80 ns at 10 V, 60 ns at 15 V
• Supply Voltage (max): 15 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Mounting Style: Through Hole
• Number Of Input Lines: 8.0
• Number Of Output Lines: 5.0
• Power Dissipation: 700 mW
• Applications: Switches, Keyboard
• Logic Type: Key Encoder
• No. Of Outputs: 4
• Supply Voltage Range: 3V To 15V
• Logic Case Style: DIP
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74C923; 74C923N

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