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MM74C923N +BOM

FAIRCHILD SEMICONDUCTOR MM74C923N IC, 74C CMOS, 74C923, DIP20, 15V

Manufacturer:

Onsemi
Mfr.Part #:

MM74C923N
Datasheet:

MM74C923N Datasheet (PDF)
Product:

Decoders, Encoders, Multiplexers & Demultiplexers
Logic Family:

74C
Number of Bits:

4 bit
Number of Input Lines:

8 Input
EDA/CAD Models:

Request Free CAD Models for MM74C923N

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MM74C923N 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 kohm 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 Product Highlights: 50 kohm 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

Key Features

20 KEY ENCODER

Specifications

Product Category	Encoders, Decoders, Multiplexers & Demultiplexers	Product	Decoders, Encoders, Multiplexers & Demultiplexers
Logic Family	74C	Number of Bits	4 bit
Number of Input Lines	8 Input	Number of Output Lines	5 Output
Propagation Delay Time	150 ns at 5 V, 80 ns at 10 V, 60 ns at 15 V	Supply Voltage - Min	3 V
Supply Voltage - Max	15 V	Minimum Operating Temperature	- 55 C
Maximum Operating Temperature	+ 125 C	Mounting Style	Through Hole
Function	Encoder	Height	3.43 mm
Input Voltage	- 300 mV to 300 mV	Length	26.92 mm
Logic Type	Encoder	Number of Circuits	Single
Operating Supply Voltage	3 V to 15 V	Output Current	8 mA
Output Voltage	- 300 mV to 300 mV	Pd - Power Dissipation	700 mW
Product Type	Encoders, Decoders, Multiplexers & Demultiplexers	Factory Pack Quantity	18
Subcategory	Logic ICs	Width	7.11 mm
Part # Aliases	MM74C923N_NL	Unit Weight	0.079719 oz