RS-485 Transceivers

2

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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.

Driver Output Voltages ..........................................-7.5V to 12.5V

Receiver Input Voltages (A, B) ..............................-7.5V to 12.5V

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

V

Input Current

(A, B)

k

Ω

96

-7V

R = 27

Ω (RS-485), Figure 1

0.4V

R = 50

Ω (RS-422), Figure 1

-7V

DE, DI,

–

R

—

E

–

DE, DI,

–

R

—

E

–

MAX1483,

R = 27

Ω or 50Ω, Figure 1

R = 27

Ω or 50Ω, Figure 1

R = 27

Ω or 50Ω, Figure 1

MAX1482,

CONDITIONS

µA

±1

Three-State (high impedance)

Output Current at Receiver

V

0.4

Receiver Output Low Voltage

3.5

Receiver Output High Voltage

mV

75

Receiver Input Hysteresis

V

-0.2

0.2

Receiver Differential Threshold

Voltage

-150

200

µA

-100

150

1.5

5

Differential Driver Output

(with load)

V

25

V

5

Differential Driver Output (no load)

µA

±2

Logic Input Current

V

0.8

Logic Input Low Voltage

V

0.2

Change in Magnitude of Driver

Common-Mode Output Voltage

for Complementary Output States

V

0.2

Change in Magnitude of Driver

Differential Output Voltage for

Complementary Output States

V

3

Driver Common-Mode Output

Voltage

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

Receiver Input Resistance

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.

DE, DI,

–

R

—

E

–

V

2.0

Logic Input High Voltage

MAX1482 only,

µA

±50

Three-State (high impedance)

Output Current at Driver