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MC14419P
2-Of-8 Keypad-To-Binary Encoder
2-OF-8 KEYPAD-TO-BINARY ENCODER
The MC14419 is designed for phone dialer system applications, but
finds many applications asa keypad-to-binary encoder. The device con-
tainsa 2-of-8to binary encoder,a strobe generator, andan illegal state
detector. The encoder has four row inputs and four column inputs, and designed to accept inputs from 16 keyswitches arranged ina4x4
matrix. Foran outputonthe four data lines, one and only one row along
with one and only one column input line mustbe activated. All other
combinations are suppressed bythe illegal state detector to eliminate
false data output.
The strobe generator producesa strobe pulse when anyof the10
keys corresponding to numeralsO through9are depressed. The strobe
output canbe usedto eliminate erroneous data entry dueto contact
bounce. Fora strobe outputto occur, the key row and column input
lines must remain stable for80 clock pulses after activation. When the *,,}tt
contact bounce has settled and80 clock pulses have occurred, the out- t’
put willbea single strobe pulse equalin width to thatofthe clock low.#}’$!
state. The strobe generator will output one and
only one pulse eq,chj,<
.<~>,,,,\,..?
timea numerical keyis depressed. After the pulse has occurred,,$x+se ““
and bounce dueto contact break will not cause another stro@#iQQ15&.
Witha16 kHz input clock frequency, the pulse occurs 5ms a~t~~th,$last
bounce. .++\,%,‘./\\.~<.?, !F,::’k:+>‘!%.‘i\}. Suppressed Output for Illegal Input Codes >f,i$,>.>
MCl~19 SUFFIX P SUFFIX
CERAMIC PACKAGE PLASTIC PACKAGE
CASE 620 CASEW
ORDERING INFORMATION
MC14XXX—
suffix Denotes= Ceramic Plastic
PIN ASSIGNMENT
n v~~ 16 R2 Clock 15 R3 ST 14 R4 D4 13
cl D3 12
C2 02 11 C3 D1 10 Vss C4 9This device contains circuitry to protect
the inputs against damage dueto high static
voltages or electric fields; howver, itis
advised that normal precautions b taken avoid application of anv voltage higher
