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MAX1482ESD ,20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 TransceiversApplicationsMAX1483CPA 0°C to +70°C 8 Plastic DIPIndustrial-Control Local Area NetworksMAX1483CSA 0 ..
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MAX1482CPD-MAX1482CSD-MAX1482EPD-MAX1482ESD
20A, 1.8-Unit-Load, Slew-Rate-Limited RS-485 Transceivers
_______________General Description
The MAX1482 and MAX1483 are low-power trans-
ceivers for RS-485 and RS-422 communication. Both
feature slew-rate-limited drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables. Data rates are guaranteed up to 250kbps.
The MAX1482/MAX1483 draw only 20µA of supply cur-
rent. Additionally, they have a low-current shutdown
mode that consumes only 0.1µA. Both parts operate
from a single +5V supply.
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that places the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high output if the input
is open circuit.
The MAX1482 is full duplex and the MAX1483 is half
duplex. Both parts have a 1⁄8-unit-load input impedance
that guarantees up to 256 transceivers on the bus.
________________________Applications

Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs
____________________________Features
Low 20µA Operating CurrentSlew-Rate Limited for Reduced EMI and
Reduced Reflections
0.1µA Low-Current Shutdown ModeDesigned for RS-485 and RS-422 ApplicationsOperate from a Single +5V Supply-7V to +12V Common-Mode Input Voltage RangeAllows up to 256 Transceivers on the Bus—
Guaranteed (1⁄8-unit load)
Current Limiting and Thermal Shutdown for
Driver Overload Protection
______________Ordering Information
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
________________________________________________________________Maxim Integrated Products1
_________________Pin Configurations
_________Typical Operating Circuits
Call toll free 1-800-998-8800 for free samples or literature.

19-0367; Rev 0; 2/95
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC)...............................................................7V
Control Input Voltages (RE, DE).................-0.5V to (VCC+ 0.5V)
Driver Input Voltage (DI).............................-0.5V to (VCC+ 0.5V)
Driver Output Voltages..........................................-7.5V to 12.5V
Receiver Input Voltages (A, B)..............................-7.5V to 12.5V
Receiver Output Voltage (RO)....................-0.5V to (VCC+ 0.5V)
Continuous Power Dissipation (TA= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C).800mW
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
8-Pin µMAX (derate 4.10mW/°C above +70°C).............330mW
Operating Temperature Ranges
MAX148_C_ _.......................................................0°C to +70°C
MAX148_E_ _.....................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
DC ELECTRICAL CHARACTERISTICS

(VCC= 5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1:
All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________3
DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS

(VCC= 5V ±5%, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 2:
Applies to peak current. See Typical Operating Characteristics.
Note 3:
The MAX1482/MAX1483 are put into shutdown by bringing–R—E–high and DE low. If the inputs are in this state for less
than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are
guaranteed to have entered shutdown. See Low-Power Shutdown Modesection.
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers_______________________________________________________________________________________
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE

MAX1482-01
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
MAX1482-02
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (ns)
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
MAX1482-03
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE

MAX1482-04
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
MAX1482
SUPPLY CURRENT
vs. TEMPERATURE
MAX1482-07
TEMPERATURE (°C)
SUPPLY CURRENT (
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX1482-05
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX1482-06
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX1483
SUPPLY CURRENT
vs. TEMPERATURE
MAX1482-08
TEMPERATURE (°C)
SUPPLY CURRENT (
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________________________________________5
______________________________________________________________Pin Description
MAX1482/MAX1483
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers_______________________________________________________________________________________

Figure 1. Driver DC Test Load
Figure 3. Driver/Receiver Timing Test CircuitFigure 4. Driver Timing Test Load
Figure 2. Receiver Timing Test Load
_________________________________________________________________Test Circuits
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