DS485M National Semiconductor, DS485M Datasheet

IC, RS422/RS485 TRANSCEIVER 5.25V NSOIC8

DS485M

Manufacturer Part Number
DS485M
Description
IC, RS422/RS485 TRANSCEIVER 5.25V NSOIC8
Manufacturer
National Semiconductor
Datasheet

Specifications of DS485M

Device Type
Transceiver
Ic Interface Type
RS422, 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
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2004 National Semiconductor Corporation
DS485
Low Power RS-485/RS-422 Multipoint Transceiver
General Description
The DS485 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 2.5
Mbps (see Applications Information section).
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 DS485 is available in surface mount and DIP packages
and is characterized for Industrial and Commercial tempera-
ture range operation.
Connection and Logic Diagram
TRI-STATE
DS485N
DS485M
DS485TN
DS485TM
OD3
Order Number
).
®
is a registered trademark of National Semiconductor Corporation.
0˚C to +70˚C
0˚C to +70˚C
−40˚C to +85˚C
−40˚C to +85˚C
DIP and SOIC
Temp. Range
01288001
DS012880
DIP/N08E
SOP/M08A
DIP/N08E
SOP/M08A
Package/###
®
Features
n Meets TIA/EIA RS-485 multipoint standard
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 Allows up to 32 transceivers on the bus
n Current-limiting and thermal shutdown for driver
n Industrial temperature range operation
n Pin and functional compatible with MAX485 and LTC485
Truth Table
*Note: Non Terminated, Open Input only
X = indeterminate
Z = TRI-STATE
DRIVER SECTION
RECEIVER SECTION
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*
X
X
X
H
L
L
L
DE
DE
H
H
X
L
L
L
L
200 µA typ
DI
H
X
L
OPEN*
≥+0.2V
≤−0.2V
A-B
X
A
H
L
Z
OD3
)
www.national.com
July 1998
RO
B
H
Z
H
Z
H
L
L

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DS485M Summary of contents

Page 1

... Industrial and Commercial tempera- ture range operation. Connection and Logic Diagram DIP and SOIC Order Number Temp. Range DS485N 0˚C to +70˚C DS485M 0˚C to +70˚C DS485TN −40˚C to +85˚C DS485TM −40˚C to +85˚C TRI-STATE ® ...

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*, DE) Driver Input Voltage (DI) 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 FIGURE FIGURE 2. FIGURE 3. FIGURE 4. www.national.com 01288002 01288004 01288006 01288008 4 01288003 FIGURE 5. V OD3 01288005 FIGURE 6. 01288007 FIGURE 7. 01288009 FIGURE 8. ...

Page 5

Parameter Measurement Information (Continued) 01288010 FIGURE 9. 01288011 FIGURE 10. 01288012 FIGURE 11. FIGURE 12. 5 01288013 www.national.com ...

Page 6

Parameter Measurement Information Pin Descriptions Pin # I/O Name Receiver Output high also if the inputs (A and B) are open (non-terminated RE* Receiver Output Enable enabled when RE* is ...

Page 7

Applications Information The DS485 is a low power transceiver designed for use in RS-485 multipoint applications. The DS485 can transmit data up to 2.5 Mbps based on a ratio of driver transition time to the unit interval (bit time) of ...

Page 8

... Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Order Number DS485M or DS485TM NS Package Number M08A Order Number DS485N or DS485TN NS Package Number N08E 8 ...

Page 9

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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