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MFG:NS Package Cooled:DIP
Part Number: MM74C923
MFG: NS
Package Cooled: DIP
Description: The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SP...
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MM74C923
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Suppliers
DataSheet
General Description
MM74C923 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.
MM74C923 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 VCC Range 3V to 15V
VCC 18V
Lead Temperature
(Soldering, 10 seconds) 260°C
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 VCC Range 3V to 15V
VCC 18V
Lead Temperature
(Soldering, 10 seconds) 260°C
MM74C923 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
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
MM74C923 Connection Diagram
MM74C923
PDF/DataSheet Download
- Datasheet: MM74C923
- File Size: 117433 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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