MM54C923J/883B
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 pull-
up devices which permit switches with up to 50 kX on resist-
ance 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 en-
tered 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 TRI-STATEÉ outputs provide
for easy expansion and bus operation and are LPTTL com-
patible.
Features
50 kX 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
TRI-STATE outpust LPTTL compatible
Wide supply range 3V to 15V
Low power consumption
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