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MM74C922
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MFG:500 Package Cooled:FSC D/C:02+

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Part Number: MM74C922

MFG: 500

Package Cooled: FSC

D/C: 02+

Description: The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SP...

MM74C922 General 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 kW 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 keyboardentry 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.

MM74C922 Maximum Ratings

Voltage at Any Pin                           VCC - 0.3V to V CC + 0.3V
Operating Temperature Range
MM74C922, MM74C923                                   -40°C to +85°C
Storage Temperature Range                          -65°C to +150°C
Power Dissipation (P _D)
Dual-In-Line                                                                700 mW
Small Outline                                                                 500 mW
Operating V_CC Range                                                 3V to 15V
V_CC                                                                                      18V
Lead Temperature
(Soldering, 10 seconds)                                                 260°C

MM74C922 Features

50 kW maximum switch on resistance
On or off chip clock
On-chip row pull-up devices
2 key roll-over
Keybounce elimination with single capacitor
Last key register at outputs
3-STATE output LPTTL compatible
Wide supply range: 3V to 15V
Low power consumption

MM74C922 Connection Diagram

MM74C922 datasheet

MM74C922
PDF/DataSheet Download

Datasheet: MM74C922
File Size: 117433 KB
Manufacturer: NSC [National Semiconductor]
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