16-Key Encoder 20-Key Encoder

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

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FAIRCHILD

仙童半導(dǎo)體

16, 20-Key Encoder

General Description These 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 pullup devices which permit switches with up to 50 kXon

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NSC

國半

16-Key Encoder 20-Key Encoder

ONSEMI

安森美半導(dǎo)體

Keyboard / Keypad Encoder for up to 16 switches

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ABCIRCUITS

IC Keyboard Encoder for up to 16 switches MM74C922 Replacement IC

The 74C922-SO is designed as a replacement chip for the obsolete MM74C922 surface mount part. The 74C922-SO contains all the logic necessary to encode a SPST keyboard switch array up to 4 by 4 in size and provide a 4 bit parallel output and a data available signal. The data available signal goes hig ? Replacement Chip for MM74C922\r\n? Fully encodes a key switch array. (up to 4 x 4)\r\n? No external parts required.\r\n? Low power consumption 1.5 mA typical.\r\n? Supply voltage 2.4 to 5.25 volts.\r\n? Last key pressed retained on data outputs.\r\n? All timing internally generated.\r\n? 2 Key rol;

ABCircuits