DataSheet.es    


PDF DM8898 Data sheet ( Hoja de datos )

Número de pieza DM8898
Descripción (DM8898 / DM8899) TRI-STATE BCD to Binary/Binary to BCD Converters
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de DM8898 (archivo pdf) en la parte inferior de esta página.


Total 8 Páginas

No Preview Available ! DM8898 Hoja de datos, Descripción, Manual

January 1987
DM8898 DM8899 TRI-STATE
BCD to Binary Binary to BCD Converters
General Description
These circuits are the TRI-STATE versions of the popular
BCD to binary and binary to BCD converters DM74184 and
DM74185A respectively They are derived from the 256-bit
ROM DM8598 Emitter connections are made to provide
direct read out of converted codes at outputs Y8 through
Y1 as shown in the truth tables Both converters compre-
hend the fact that the least significant bits (LSB) of the bina-
ry and BCD codes are logically equal and in each case the
LSB bypasses the converter Thus a 6-bit converter is pro-
duced in each case and both devices are cascadable
An overriding enable input is provided on each converter
which when taken high inhibits the function causing all
outputs to go into the high-impedance state For this rea-
son 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
DM8898 BCD-TO-BINARY CONVERTERS
The 6-bit BCD-to-binary function of the DM8898 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 DM8898 is pro-
grammed to generate BCD 9’s complement or BCD 10’s
complement 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 conver-
sion they are utilized to provide these complement codes
as specified in the function table when the devices are con-
nected as shown
DM8899A 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
Features
Y TRI-STATE versions of DM74184 DM74185A
Y Typical propagation delay 30 ns
Connection Diagram
Dual-In-Line Package
Order Number DM8898N or DM8899N
See NS Package Number N16A
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6593
TL F 6593 – 1
RRD-B30M105 Printed in U S A

1 page




DM8898 pdf
Function Tables
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 Z Z Z Z Z
Any X X X X X H Z Z Z
H e High Level L e Low Level Z e High Impedance
Note A Input conditions other than those shown produce highs at outputs Y1 through Y5
Note B Outputs 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
6-Bit Converter
BCD 9’s
Complement Converter
BCD 10’s
Complement Converter
TL F 6593–2
TL F 6593 – 3
5
TL F 6593 – 4

5 Page










PáginasTotal 8 Páginas
PDF Descargar[ Datasheet DM8898.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
DM8898(DM8898 / DM8899) TRI-STATE BCD to Binary/Binary to BCD ConvertersNational Semiconductor
National Semiconductor
DM8899(DM8898 / DM8899) TRI-STATE BCD to Binary/Binary to BCD ConvertersNational Semiconductor
National Semiconductor

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar