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National Semiconductor Electronic Components Datasheet


74184

BCD-to-Binary and Binary-to-BCD Converters



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74184 pdf
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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74184 pdf
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Output Voltage
7V
Operating Free Air Temperature
Range
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
VOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
Low Level Output Current
Free Air Operating Temperature
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Min Nom Max Units
4 75 5 5 25 V
2V
08 V
55 V
12 mA
0 70 C
’184 and ’185A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
VI
ICEX
VOL
II
IIH
IIL
ICCH
ICCL
Parameter
Input Clamp Voltage
High Level Output
Current
Low Level Output
Voltage
Input Current Max
Input Voltage
High Level Input Current
Low Level Input Current
Supply Current with
Outputs High
Supply Current with
Outputs Low
Conditions
VCC e Min II e b12 mA
VCC e Min VO e 5 5V
VIL e Max VIH e Min
VCC e Min IOL e Max
VIH e Min VIL e Max
VCC e Max VI e 5 5V
VCC e Max VI e 2 4V
VCC e Max VI e 0 4V
VCC e Max
VCC e Max
Min
Typ
(Note 1)
65
80
Max
b1 5
100
04
1
25
b1
95
99
Units
V
mA
V
mA
mA
mA
mA
mA
’184 and ’185A Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL1 e 400X RL2 e 600X
CL e 15 pF (See Test Circuit)
Min Max
tPLH
Propagation Delay Time
Enable G
Low to High Level Output
to Output
35
tPHL
Propagation Delay Time
Enable G
High to Low Level Output
to Output
35
tPLH
Propagation Delay Time
Binary Select
Low to High Level Output
to Output
35
tPHL
Propagation Delay Time
Binary Select
High to Low Level Output
to Output
35
Note 1 All typicals are at VCC e 5V TA e 25 C
Units
ns
ns
ns
ns
2



Part Number 74184
Description BCD-to-Binary and Binary-to-BCD Converters
Maker National Semiconductor - National Semiconductor
Total Page 10 Pages
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