MM74C923WM Fairchild Semiconductor, MM74C923WM Datasheet - Page 7

• Manufacturer Part Number: MM74C923WM
• Description: IC ENCODER 20-KEY 20-SOIC
• Manufacturer: Fairchild Semiconductor
• Series: 74Cr
• Type: 20-Key Encoderr

Specifications of MM74C923WM

• 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: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• 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: SMD/SMT
• 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: 5
• Supply Voltage Range: 3V To 15V
• Logic Case Style: SOIC
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Performance Characteristics
Typical Applications
The keyboard may be synchronously scanned by omitting the capacitor at
osc. and driving osc. directly if the system clock rate is lower than 10 kHz
Synchronous Handshake (MM74C922)
Typical I
Typical F
rp
vs V
SCAN
IN
at Any Y Input
vs C
OSC
7
Outputs are enabled when valid entry is made and go into 3-STATE when
key is released.
The keyboard may be synchronously scanned by omitting the capacitor at
osc. and driving osc. directly if the system clock rate is lower than 10 kHz
Synchronous Data Entry Onto Bus (MM74C922)
Typical R
Typical Debounce Period vs C
on
vs V
OUT
at Any X Output
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