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INS8245N (74C922 16-Key Encoder)

INS8245N = MM74C922 16-Key Encoder

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10,50 € TTC

INS8245N

Disponibilité : En stock

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INS8245N = MM74C922 16-Key Encoder

General Description
The INS8245N CMOS key encoder 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 kΩ 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. The 3-STATE outputs provide for
easy expansion and bus operation and are LPTTL compatible

Features
 50 kΩ 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

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