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PDF DS1487 Data sheet ( Hoja de datos )
| Número de pieza | DS1487 | |
| Descripción | Low Power RS-485 1/4 Unit Load Multipoint Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 1997
DS1487
Low Power RS-485 Unit Load Multipoint Transceiver
General Description
The DS1487 is a low-power transceiver for RS-485 and
RS-422 communication The device contains one driver and
one receiver The drivers slew rate allows for operation up
to 2 0 Mbps (see Applications Information section) The
transceiver presents unit loading to the RS-485 bus al-
lowing up to 128 nodes to be connected together without
the use of repeaters
The transceiver draws 200 mA of supply current when un-
loaded or fully loaded with the driver disabled and operates
from a single a5V supply
The driver is short-circuit current limited and is protected
against excessive power dissipation by thermal shutdown
www.DataSheet4Uc.icrcouimtry that places the driver outputs into TRI-STATE
(High Impedance state) under fault conditions The driver
guarantees a minimum of 1 5V differential output voltage
with maximum loading across the common mode range
(VOD3)
The receiver has a failsafe feature that guarantees a logic-
high output if the input is open circuit
The DS1487 is available in surface mount and DIP pack-
ages
Features
Y Meets TIA EIA RS-485 multipoint standard
Y Allows up to 128 transceivers on the bus ( U L )
Y Guaranteed full load output voltage (VOD3)
Y Low quiescent current
200 mA typ
Y b7V to a12V common-mode input voltage range
Y TRI-STATE outputs on driver and receiver
Y AC performance
Driver transition time
Driver propagation delay
Driver skew
Receiver propagation delay
Receiver skew
25 ns typ
40 ns typ
1 ns typ
200 ns typ
20 ns typ
Y Half-duplex flow through pinout
Y Operates from a single 5V supply
Y Current-limiting and thermal shutdown for driver over-
load protection
Y Pin and functional compatible with MAX1487
Connection and Logic Diagram
Truth Table
Order Number
DS1487N
DS1487M
DIP and SOIC
Temp Range
0 C to a70 C
0 C to a70 C
TL F 12920 – 1
Package
DIP N08E
SOP M08A
DRIVER SECTION
RE DE DI
A
XHHH
XHL L
XLXZ
RECEIVER SECTION
RE DE
A-B
LL
LL
HX
LL
ta0 2V
sb0 2V
X
OPEN
Note Non Terminated Open Input only
X e indeterminate
Z e TRI-STATE
B
L
H
Z
RO
H
L
Z
H
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL F 12920
RRD-B30M17 Printed in U S A
http www national com
1 page  
Parameter Measurement Information (Continued)
FIGURE 9
TL F 12920 – 10
FIGURE 10
TL F 12920 – 11
www.DataSheet4U.com
FIGURE 11
TL F 12920 – 12
FIGURE 12
FIGURE 13
5
TL F 12920 – 13
TL F 12920 – 14
http www national com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS1487.PDF ] | |
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