DS1487M National Semiconductor, DS1487M Datasheet

IC, RS-485 TRANSCEIVER, 5V, NSOIC-8

DS1487M

Manufacturer Part Number
DS1487M
Description
IC, RS-485 TRANSCEIVER, 5V, NSOIC-8
Manufacturer
National Semiconductor
Datasheet

Specifications of DS1487M

Device Type
Transceiver
Ic Interface Type
RS485
No. Of Drivers
1
Supply Voltage Range
4.75V To 5.25V
Driver Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
0°C To +70°C
Data Rate
2Mbps
Interface Circuit Standard 1
EIA/TIA-485/RS-485
Number Of Receivers
1
Number Of Transmitters
1
Number Of Transceivers
1
Data Transmission Topology
Multipoint
Receiver Signal Type
Differential
Transmitter Signal Type
Differential
Single Supply Voltage (typ)
5V
Single Supply Voltage (min)
4.75V
Single Supply Voltage (max)
5.25V
Dual Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Supply Current
0.5mA
Power Supply Requirement
Single
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
DS1487M
Manufacturer:
NS
Quantity:
898
Part Number:
DS1487M
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
DS1487MX
Manufacturer:
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Quantity:
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© 1999 National Semiconductor Corporation
DS1487
Low Power RS-485
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 trans-
ceiver presents
to 128 nodes to be connected together without the use of re-
peaters.
The transceiver draws 200 µA of supply current when un-
loaded or fully loaded with the driver disabled and operates
from a single +5V supply.
The driver is short-circuit current limited and is protected
against excessive power dissipation by thermal shutdown
circuitry 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
(V
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.
Connection and Logic Diagram
*Note: Non Terminated, Open Input only
TRI-STATE
DS1487N
DS1487M
Order Number
OD3
).
®
is a registered trademark of National Semiconductor Corporation.
1
4
unit loading to the RS-485 bus allowing up
0˚C to +70˚C
0˚C to +70˚C
DIP and SOIC
Temp. Range
DS012920-1
DS012920
DIP/N08E
SOP/M08A
1
Package/ ###
4
Unit Load Multipoint Transceiver
®
Features
n Meets TIA/EIA RS-485 multipoint standard
n Allows up to 128 transceivers on the bus (
n Guaranteed full load output voltage (V
n Low quiescent current:
n −7V to +12V common-mode input voltage range
n TRI-STATE outputs on driver and receiver
n AC performance:
n Half-duplex flow through pinout
n Operates from a single 5V supply
n Current-limiting and thermal shutdown for driver
n Pin and functional compatible with MAX1487
Truth Table
X = indeterminate
Z = TRI-STATE
Note 1: Non Terminated, Open Input only
DRIVER SECTION
RECEIVER SECTION
(Note 1)
(Note 1)
overload protection
— Driver transition time: 25 ns typ
— Driver propagation delay: 40 ns typ
— Driver skew: 1 ns typ
— Receiver propagation delay: 200 ns typ
— Receiver skew: 20 ns typ
RE
RE
H
X
X
X
L
L
L
DE
DE
H
H
X
L
L
L
L
OPEN (Note 1)
200 µA typ
DI
H
X
L
+0.2V
−0.2V
A-B
X
OD3
A
H
L
Z
)
1
www.national.com
4
U.L.)
July 1998
RO
B
H
Z
H
Z
H
L
L

Related parts for DS1487M

DS1487M Summary of contents

Page 1

... Connection and Logic Diagram DIP and SOIC DS012920-1 *Note: Non Terminated, Open Input only Order Number Temp. Range DS1487N 0˚C to +70˚C DS1487M 0˚C to +70˚C TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS012920 ⁄ Unit Load Multipoint Transceiver ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Enable Input Voltage (RE (Note 1), DE) −0. Driver Input Voltage (DI) −0. Driver Output Voltage (A, B) Receiver Input Voltage (A, B) Receiver Output Voltage (RO) − ...

Page 3

Switching Characteristics Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes Symbol Parameter t Driver Differential Propagation Delay — Low to High PLHD t Driver Differential Propagation Delay — High to Low PHLD t Differential ...

Page 4

Parameter Measurement Information (Continued) FIGURE 4. FIGURE 5. FIGURE 6. *Note: Non Terminated, Open Input only www.national.com DS012920-5 *Note: Non Terminated, Open Input only DS012920-6 DS012920-7 FIGURE 11. 4 DS012920-8 FIGURE 7. DS012920-9 FIGURE 8. DS012920-10 FIGURE 9. DS012920-11 FIGURE ...

Page 5

Parameter Measurement Information *Note: Non Terminated, Open Input only *Note: Non Terminated, Open Input only Pin Descriptions Pin I/O Name # Receiver Output high also if the inputs (A and B) are open (non-terminated). ...

Page 6

Applications Information Due to the multipoint nature of the bus, contention between drivers may occur. This will not cause damage to the drivers since they feature short-circuit protection and also thermal shutdown protection. Thermal shutdown senses die tem- perature and ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS1487N NS Package Number N08E 7 www.national.com ...

Page 8

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 ...

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