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MCl~19
2-OF-8 KEYPAD-TO-BINARY ENCODER
The MC14419 is designed for phone dialer system applications, but
finds many applications as a keypad-to-binary encoder. The device con-
tains a 2-of-8 to binary encoder, a strobe generator, and an illegal state
detector. The encoder has four row inputs and four column inputs, and
is designed to accept inputs from 16 keyswitches arranged in a 4x 4
matrix. For an output on the four data lines, one and only one row along
with one and only one column input line must be activated. All other
combinations are suppressed by the illegal state detector to eliminate
false data output.
The strobe generator produces a strobe pulse when any of the 10
keys corresponding to numerals O through 9 are depressed.
MC14419 Datasheet
