Integrated Circuit Chip MM74C922WMX - Fairchild Semiconductor - 16-Key Encoder 20-Key Encoder

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Description

Detailed Product Description

Quick Detail:

 

 16-Key Encoder 20-Key Encoder

 

 

Description:

 

The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches. The keyboard scan can be implemented by either an external clock or external capacitor. These encoders also have on-chip pull-up devices which permit switches with up to 50 kΩ on resistance to be used. No diodes in the switch array are needed to eliminate ghost switches. The internal debounce circuit needs only a single external capacitor and can be defeated by omitting the capacitor. A Data Available output goes to a high level when a valid keyboard entry has been made. The Data

Available output returns to a low level when the entered key is released, even if another key is depressed. The Data Available will return high to indicate acceptance of the new key after a normal debounce period; this two-key roll-over is provided between any two switches.

An internal register remembers the last key pressed even after the key is released. The 3-STATE outputs provide for easy expansion and bus operation and are LPTTL compatible.

 

 

Applications:

 

■ 50 kΩ maximum switch on resistance

â–  On or off chip clock

â–  On-chip row pull-up devices

â–  2 key roll-over

â–  Keybounce elimination with single capacitor

â–  Last key register at outputs

â–  3-STATE output LPTTL compatible

â–  Wide supply range: 3V to 15V

â–  Low power consumption

 

 

Specifications:

 

Datasheets

MM74C922,923WM

Product Photos

20-SOIC 0.295

Standard Package

1,000

Category

Integrated Circuits (ICs)

Family

Logic - Signal Switches, Multiplexers, Decoders

Series

74C

Packaging

Tape & Reel (TR)

Type

16-Key Encoder

Circuit

1 x 8:4

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 (0.295", 7.50mm Width)

Supplier Device Package

20-SOIC

 

 

Competitive Advantage:

 

Warranty :180 days !
Free shipping: Order over $1000 win a free shipment fee
(goods weight below 3Kg) ,during 20130901-20130930 .


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