MC14419P Motorola, MC14419P Datasheet

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MC14419P

Manufacturer Part Number
MC14419P
Description
2-of-8 keypad-to-binary encoder
Manufacturer
Motorola
Datasheet

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finds many applications
tains a 2-of-8 to binary encoder,
detector.
with one and only one column
output
state.
time a numerical
With a 16 kHz input clock frequency,
is designed
matrix. For an output on the four data lines, one and only one row along
combinations
false data output.
keys corresponding
bounce.
lines must remain stable for 80 clock pulses after activation.
contact
put will be a single strobe pulse equal in width
and bounce due to contact
bounce.
.
The MC14419
The strobe generator
Suppressed
The strobe
can be used to eliminate
bounce has settled and 80 clock pulses have occurred,
For a strobe output
The encoder has four row inputs and four column inputs, and
2-OF-8 KEYPAD-TO-BINARY
to accept
are suppressed
Output for Illegal Input Codes
is designed
key is depressed.
generator
to numerals O through 9 are depressed.
inputs from 16 keyswitches
as a keypad-to-binary
produces
break will not cause another
will
for phone dialer system applications,
to occur,
by the illegal state detector
input line must be activated.
a strobe generator,
output
erroneous
a strobe
After the pulse has occurred,,$x+se
the pulse
the key row and column
one and only one pulse eq,ch j,<
pulse when
data entry due to contact
encoder.
occurs
ENCODER
to that of the clock low.#}’ $!
,>.>
arranged
and an illegal state
5 ms a~t~~th,$last
The device con-
>f,i$
any of the 10
stro@#iQQ15&.
)~ ~<.?,
‘!%.
to eliminate
The strobe
.++\,%, ‘./\\ .
‘i\}.
!F,::’k:+>
When
in a 4x 4
All other
the out-
input
but
the
.<~>,,,,
\,..?
““
t’
*,,}tt
MOTOROLA
CERAMIC PACKAGE
the inputs against damage due to high
voltages
advised
to
constrained
Vout)
This
than
impedance
IS
avoid
recommended
CASE 620
L SUFFIX
maximum
device contains
< VDD.
MC14XXX —
4
5
6
7
8
2
3
1
INC , lW
that
ORDERING INFORMATION
n
or
application
MCl~19
circuit.
PIN ASSIGNMENT
to
electric
normal
cl
C2
C3
RI
R2
R3
R4
Vss
the
rated
L
that
For
suffix
range
fields;
of anv voltage
precautions
voltages
circuitry
L = Ceramic
P = Plastic
proper
Clock
Vin
v~~
PLASTIC PACKAGE
C4
ST
D4
D3
02
D1
VSS
howver,
and
Denotes
P SUFFIX
CASE W
operation
to this
to protect
<
b
Vout
15
12
(Vin
16
14
13
11
10
9
higher
taken
static
it
high
be
or
DS9892
is
it

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MC14419P Summary of contents

Page 1

... This the inputs against damage due to high voltages advised to than impedance IS constrained Vout) MOTOROLA — MCl~19 L SUFFIX P SUFFIX PLASTIC PACKAGE CASE 620 CASE W ORDERING INFORMATION MC14XXX — suffix Denotes L = Ceramic Plastic n PIN ASSIGNMENT ...

Page 2

... Output Rise and Fall Times, Q,f t~~$$#4 (Figure Propagation DelaV Time, Q@$&r~Qolumn Input to Data Output ( Figure 1%$. ~~~~’ ,??. > \.. Clock Pulse Freque~&~;@#R& .q~) “.* > .L ,.... “~,!e, , ,,,,, $,>, \y,,.. ~ .),“~~ $. MOTOROLA @ (Voltages referenced to VSS, Pin 8.) Symbol VDD Range TA Range Tstg 40°c VDD Min Max ...

Page 3

... PACKAGE INOEX: NOTCH IN LEAD NDTCH IN CERAMIC OR INK OOT. 3. DIM “VTO CENTER OF LEADS WHEN FDRMED PARALLEL. 4. OIM “A’’AND ‘,B”DO NOT INCLUDE GLASS RUN-OUT, 5. DIM “F” MAY NARROW TO 0.76 mm (0.030) WHERE THE LEAD ENTERS THE CERAMIC BOOY. MOTOROLA @ TIMING DIAGRAM ‘ ...

Page 4

... FIGURE 4- Motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Motorola does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others ...

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