Product Summary

The MM74C923 CMOS key encoder provides all the necessary logic to fully encode an array of SPST switches. The keyboard scan of the MM74C923 can be implemented by either an external clock or external capacitor. The MM74C923 also havs on-chip pull-up device which permits witches with up to 50 kΩ; on resistance to be used.

Parametrics

MM74C923 absolute maximum ratings: (1) Voltage at Any Pin: Vcc -0.3V to Vcc +0.3V; (2) Operating Temperature Range: -40°C t0 +85°C; (3) torage Temperature Range: -65°C to +150°C; (4) Power Dissipation (P D) Dual -In-Line: 700wM; (5) Operating VCC Range: 3V to 15V, VCC: 18V ; (6) Lead Temperature (Soldering, 10 seconds) : 260°C.

Features

MM74C923 features: (1) 50kΩ, maximum switch on resistance; (2) On or off chip clock On-chip row pull-up devices; (3) 2 key roll-over; (4) Keybounce elimination with single capacitor; (5) Last key register at utputs; (6) 3-STATE output LPTTL compatible; (7) Wide supply range: 3V to 15V; (8) Low power consumption.

Diagrams

MM74C923 Connection Diagram

Image Part No Mfg Description Data Sheet Download Pricing
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MM74C923WM
MM74C923WM

Fairchild Semiconductor

Encoders, Decoders, Multiplexers & Demultiplexers 20-Key Encoder

Data Sheet

Negotiable 
MM74C923WM_Q
MM74C923WM_Q

Fairchild Semiconductor

Encoders, Decoders, Multiplexers & Demultiplexers 20-Key Encoder

Data Sheet

Negotiable 
MM74C923WMX
MM74C923WMX

Fairchild Semiconductor

Encoders, Decoders, Multiplexers & Demultiplexers 20-Key Encoder

Data Sheet

Negotiable