16-Key Encoder / 20-Key Encoder

General Description\nThese 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 res 50 kXmaximum switch on resistance\nOn or off chip clock\nOn-chip row pull-up devices\n2 key roll-over\nKeybounce elimination with single capacitor\nLast key register at outputs\nTRI-STATE outpust LPTTL compatible\nWide supply range                              3V to 15V\nLow power consumption;

TI

德州仪器

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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NSCNational Semiconductor (TI)

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