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PDF DM74184 Datasheet ( Hoja de datos )

Número de pieza DM74184
Descripción (DM74184 / DM74185A) BCD-to-Binary and Binary-to-BCD Converters
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo

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DM74184 Hoja de datos, Descripción, Manual
June 1989
DM74184 DM74185A
BCD-to-Binary and Binary-to-BCD Converters
General Description
These monolithic converters are derived from the 256-bit
read only memories DM5488 and DM7488 Emitter con-
nections are made to provide direct read-out of converted
codes at outputs Y8 through Y1 as shown in the function
tables These converters demonstrate the versatility of a
read only memory in that an unlimited number of reference
tables or conversion tables may be built into a system Both
of these converters comprehend that the least significant
bits (LSB) of the binary and BCD codes are logically equal
and in each case the LSB bypasses the converter as illus-
trated in the typical applications This means that a 6-bit
converter is produced in each case Both devices are cas-
cadable to N bits
An overriding enable input is provided on each converter
which when taken high inhibits the function causing all out-
puts to go high For this reason and to minimize power
consumption unused outputs Y7 and Y8 of the 185A and all
‘‘don’t care’’ conditions of the 184 are programmed high
The outputs are of the open-collector type
DM74184 BCD-TO-BINARY CONVERTERS
The 6-bit BCD-to-binary function of the DM74184 is analo-
gous to the algorithm
a Shift BCD number right one bit and examine each dec-
ade Subtract three from each 4-bit decade containing a
binary value greater than seven
b Shift right examine and correct after each shift until the
least significant decade contains a number smaller than
eight and all other converted decades contain zeros
In addition to BCD-to-binary conversion the DM74184 is
programmed to generate BCD 9’s complement or BCD 10’s
complement Again in each case one bit of the comple-
ment code is logically equal to one of the BCD bits there-
fore these complements can be produced on three lines
As outputs Y6 Y7 and Y8 are not required in the BCD-to-bi-
nary conversion they are utilized to provide these comple-
ment codes as specified in the function table when the de-
vices are connected as shown
DM74185A BINARY-TO-BCD CONVERTERS
The function performed by these 6-bit binary-to-BCD con-
verters is analogous to the algorithm
a Examine the three most significant bits If the sum is
greater than four add three and shift left one bit
b Examine each BCD decade If the sum is greater than
four add three and shift left one bit
c Repeat step b until the least-significant binary bit is in the
least-significant BCD location
(Continued)
Connection Diagram
Order Number DM74184N or DM74185AN
See NS Package Number N16E
TL F 6561 – 1
C1995 National Semiconductor Corporation TL F 6561
RRD-B30M105 Printed in U S A

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DM74184 pdf
Function Tables (Continued)
BCD-to-Binary Converter
BCD 9’s or BCD 10’s Complement Converter
BCD
Words
Inputs
(See Note A)
Outputs
(See Note B)
E D C B A G Y5 Y4 Y3 Y2 Y1
BCD
Word
E
Inputs
(See Note C)
Outputs
(See Note D)
D C B A G Y8 Y7 Y6
0 1 LLLLLL L L L L L
2 3 LLLLHL L L L L H
4 5 LLLHLL L L L H L
6 7 L L LHHL L L L H H
8 9 LLHLL L L L H L L
0 L LLLLL H L H
1 L LLLHL H L L
2 L LLHL L L H H
3 L L LHHL L H L
4 L LHLL L L H H
10 11 L H L L L L L L H L H
12 13 L H L L H L L L H H L
14 15 L H L H L L L L H H H
16 17 L H L H H L L H L L L
18 19 L H H L L L L H L L H
5 L LHLHL L H L
6 L LHHL L L L H
7 L LHHH L L L L
8 L HLLL L L L H
9 L HLLHL L L L
20 21 H L L L L L L H L H L
22 23 H L L L H L L H L H H
24 25 H L L H L L L H H L L
26 27 H L L H H L L H H L H
28 29 H L H L L L L H H H L
0 H LLLLL L L L
1 H LLLHL H L L
2 H LLHL L H L L
3 H L LHH L L H H
4 H LHLL L L H H
30 31 H H L L L L L H H H H
32 33 H H L L H L H L L L L
34 35 H H L H L L H L L L H
36 37 H H L H H L H L L H L
38 39 H H H L L L H L L H H
5 H LHLHL L H L
6 H LHHL L L H L
7 H LHHH L L L H
8 H HLLL L L L H
9 H HLLHL L L L
Any X X X X X H H H H H H
Any X X X X X H H H H
H e High Level L e Low Level X e Don’t Care
Note A Input Conditions other than those shown produce highs at outputs Y1 through Y5
Note B Output Y6 Y7 and Y8 are not used for BCD-to-Binary conversion
Note C Input conditions other than those shown produce highs at outputs Y6 Y7 and Y8
Note D Outputs Y1 through Y5 are not used for BCD 9’s or BCD 10’s complement conversion
When these devices are used as complement converters input E is used as a mode control With this input low the BCD 9’s complement is generated when it is
high the BCD 10’s complement is generated
Test Circuit
Typical Applications
CL includes probe and jig capacitance
TL F 6561 – 6
TL F 6561 – 7
FIGURE 1 BCD-to-Binary Converter
for Two BCD Decades
MSD Most significant decade
LSD Least significant decade
Each rectangle represents a DM74184
5

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