CONVERTIR CÓDIGO BCD A EXCESO 3 CON COMPUERTAS LÓGICAS.
Decodificador Bcd a 7 SegmentosDescripción completa
los sumadores son aquellos que realizan operaciones de suma. mayormente se realizan con números binarios, estos los podemos encontrar en la unidad aritmético lógica del computadorDescripción completa
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mt bits
edc mid questions
edc mid questions
Es la entrega correspondiente al mes de julio de la investigación que vengo desarrollando de la Construcción de un Módulo para la enseñanza de Electrónica Digital usando la tecnología FPGA. …Full description
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Descripción: INFORME CODIGO BCD
Soalan Final OSFull description
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Contiene una explicacion del funcionamiento de un microcontrolador
June 1989
DM74184DM74185A 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 connections are made to provide direct read-out of converted codes at outputs Y8 through Y1 as shown in the function tables tables These These converter converters s demonstrat demonstrate e the versatilit versatility y 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 illustrated trated in the typical application applications s This means that a 6-bit 6-bit converter is produced in each case Both devices are cascadable to N bits An overriding overriding enable input is provided provided on each converter converter which when taken high inhibits the function causing all outputs 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
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 addition to BCD-to-b BCD-to-binary inary conversion conversion the DM74 DM74184 184 is programmed to generate BCD 9’s complement or BCD 10’s complement Again in each case one bit of the complement code is logically equal to one of the BCD bits therefore these complements can be produced on three lines As outputs Y6 Y7 and Y8 are not required in the BCD-to-binary conversion they are utilized to provide these complement codes as specified in the function table when the devices are connected as shown DM74185A BINARY-TO-BCD CONVERTERS
The function performed by these 6-bit binary-to-BCD converters is analogous to the algorithm a Examine Examine the three most significant significant bits If the sum is greater than four add three and shift left one bit
DM74184 BCD-TO-BINARY CONVERTERS
b Examine each BCD decade If the sum is greater than four add three and shift left one bit
The 6-bit BCD-to-binary function of the DM74184 is analogous to the algorithm
c Repeat step b until the least-significant binary bit is in the least-significant BCD location
a Shift BCD number right one bit and examine each decade Subtract three from each 4-bit decade containing a binary value greater than seven
(Continued)
Connection Diagram
TLF6561–1
Order Number DM74184N or DM74185AN See NS Package Number N16E
C1995 N ational Semiconductor Corporation
TLF6561
RRD-B30M105Printed in U S A
D M 7 4 1 8 4 D M 7 4 1 8 5 A B C D -t o -B i n a r y a n d B i n a r y t o -B C D C o n v e r t e r s
Absolute Maximum Ratings (Note) 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
If MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications
Supply Voltage
7V
Input Voltage
55V
Output Voltage
7V
Operating Free Air Temperature Range
0 C to
Storage Temperature Range
a 70 C
b65 C to a 150 C
Recommended Operating Conditions Symbol
Parameter
Min
Nom
Max
475
5
525
Units
VCC
Supply Voltage
VIH
High Level Input Voltage
V
VIL
Low Level Input Voltage
08
V
VOH
High Level Output Voltage
55
V
IOL
Low Level Output Current
12
mA
TA
Free Air Operating Temperature
70
C
2
V
0
’184 and ’185A Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol
Parameter
Conditions
Min
e b12
Typ (Note 1)
mA
Max
Units
b15
V
VI
Input Clamp Voltage
VCC e Min II
ICEX
High Level Output Current
VCC e Min VO e 55V VIL e Max V IH e Min
100
mA
VOL
Low Level Output Voltage
VCC e Min IOL e Max VIH e Min VIL e Max
04
V
II
Input Current Max Input Voltage
VCC e Max VI e 55V
1
mA
IIH
Hig h Level Input Current
VCC e Max VI e 24V
25
mA
IIL
Low Level Input Current
VCC e Max VI e 04V
b1
mA
ICCH
Supply Current with Outputs High
VCC e Max
65
95
mA
ICCL
Supply Current with Outputs Low
VCC e Max
80
99
mA
’184 and ’185A Switching Characteristics at V CC
e
Symbol
5V and TA
e
25 C (See Section 1 for Test Waveforms and Output Load) RL1 e 400X R L2 e 600X CL e 15 pF (See Test Circuit)
From (Input) To (Output)
Parameter
Min
Units
Max
tPLH
Propagation Delay Time Low to High Level Output
Enable G to Output
35
ns
tPHL
Propagation Delay Time High to Low Level Output
Enable G to Output
35
ns
tPLH
Propagatio n Delay Time Low to High Level Output
Binary Select to Output
35
ns
tPHL
Propagatio n Delay Time High to Low Level Output
Binary Select to Output
35
ns
Note 1 All typicals are at VCC
e
5V TA
e
25 C
2
General Description (Continued) DM74184 BCD-to-Binary TABLE I Package Count and Delay Times for BCD-to-Binary Conversion Input (Decades)
Packages Required
2 3 4 5 6
2 6 12 19 28
6-Bit Converter
Total Delay Ti mes (ns) Typ
Max
56 140 196 280 364
80 200 280 400 520
BCD 9’s Complement Converter
BCD’s 10’s Complement Converter
TLF6561–2
TLF6561–4
TLF6561–3
DM74185A Binary-to-BCD
TABLE II Package Count and Delay Times for Binary-to-BCD Conversion Input (Bits)
Function Tables (Continued) BCD-to-Binary Converter Inputs ( Se e N ote A )
BCD Words
BCD 9’s or BCD 10’s Complement Converter
Outputs ( Se e N ote B )
E D C B A G Y5 Y4 Y3 Y2 Y 1
Outputs (See Note D)
E
D
C
B
A
G
Y8
Y7
Y6
0 2 4 6 8
1 3 5 7 9
L L L L L
L L L L L L L L L H
L L H H L
L H L H L
L L L L L
L L L L L
L L L L L
L L L L H
L L H H L
L H L H L
0 1 2 3 4
L L L L L
L L L L L
L L L L H
L L H H L
L H L H L
L L L L L
H H L L L
L L H H H
H L H L H
10 12 14 16 18
11 13 15 17 19
L L L L L
H H H H H
L L L L H
L L H H L
L H L H L
L L L L L
L L L L L
L L L H H
H H H L L
L H H L L
H L H L H
5 6 7 8 9
L L L L L
L L L H H
H H H L L
L H H L L
H L H L H
L L L L L
L L L L L
H L L L L
L H L H L
20 22 24 26 28
21 23 25 27 29
H H H H H
L L L L L L L L L H
L L H H L
L H L H L
L L L L L
L L L L L
H H H H H
L L H H H
H H L L H
L H L H L
0 1 2 3 4
H H H H H
L L L L L
L L L L H
L L H H L
L H L H L
L L L L L
L H H L L
L L L H H
L L L H H
30 32 34 36 38
31 33 35 37 39
H H H H H
H H H H H
L L H H L
L H L H L
L L L L L
L H H H H
H L L L L
H L L L L
H L L H H
H L H L H
5 6 7 8 9
H H H H H
L L L H H
H H H L L
L H H L L
H L H L H
L L L L L
L L L L L
H H L L L
L L H H L
X X X X X H
H
H
H
H
H
Any
X
X
X
X
X
H
H
H
H
Any H
Inputs (See Note C)
BCD Word
e
High Level L
e
L L L L H
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
TLF6561–6
CL includes probe and jig capacitance
TLF6561–7
FIGURE 1 BCD-to-Binary Converter for Two BCD Decades MSDMost significant decade LSDLeast significant decade Each rectangle represents a DM74184
5
Typical Applications (Continued)
TLF6561–9
FIGURE 2 BCD-to-Binary Converter for Six BCD Decades MSDMost significant decade LSDLeast significant decade Each rectangle represents a DM74184
6
Typical Applications (Continued)
TLF6561–10
FIGURE 4 6-Bit Binary-to-BCD Converter MSDMost significant decade LSDLeast significant decade Note A Each rectangle represents a DM74185A Note B All unused E inputs are grounded
TLF6561–8
FIGURE 3 BCD-to-Binary Converter for Three BCD Decades MSDMost significant decade LSDLeast significant decade Each rectangle represents a DM74184
FIGURE 7 12-Bit Binary-to-BCD Converter (See Note B) TLF6561–14
FIGURE 8 16-Bit Binary-to-BCD Converter (See Note B) MSDMost significant decade LSDLeast significant decade Note A Each rectangle represents a DM74185A Note B All unused E inputs are grounded
8
9
s r Physical Dimensions inches (millimeters) e t r e v n o C D C B o ty r a n i B d n a y r a 16-Lead Molded Dual-In-Line Package (N) n i Order Number DM74184N or DM74185AN B NS Package Number N16E o tD C B A 5 8 1 4 7 M D 4 8 1 4 7 M D LIFE SUPPORT POLICY
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