Low-Power, Slew-Rate-Limited

RS-485/RS-422 Transceivers

2

Maxim Integrated

MAX481/MAX483/MAX485/

MAX487–MAX491/MAX1487

ABSOLUTE MAXIMUM RATINGS

Driver Output Voltage (A, B)...................................-8V to +12.5V

Receiver Input Voltage (A, B).................................-8V 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 4.1mW/°C above +70°C) ..............830mW

8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW

14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW

Operating Temperature Ranges

MAX4_ _C_ _/MAX1487C_ A ...............................0°C to +70°C

MAX4_ _E_ _/MAX1487E_ A .............................-40°C to +85°C

MAX4_ _M_/MAX1487MJA .............................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

DC ELECTRICAL CHARACTERISTICS

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.

V

Input Current

(A, B)

k

Ω

48

-7V

Receiver Input Resistance

-7V

MAX487/MAX1487

R = 27

Ω (RS-485), Figure 4

0.4V

R = 50

Ω (RS-422)

-7V

DE, DI, RE

DE, DI, RE

MAX487/MAX1487,

DE, DI, RE

R = 27

Ω or 50Ω, Figure 4

R = 27

Ω or 50Ω, Figure 4

R = 27

Ω or 50Ω, Figure 4

DE = 0V;

all devices except

MAX487/MAX1487

CONDITIONS

k

Ω

12

µA

±1

Three-State (high impedance)

Output Current at Receiver

V

0.4

Receiver Output Low Voltage

3.5

Receiver Output High Voltage

mV

70

Receiver Input Hysteresis

V

-0.2

0.2

Receiver Differential Threshold

Voltage

-0.2

mA

0.25

mA

-0.8

1.0

1.5

5

Differential Driver Output

(with load)

V

2

V

5

Differential Driver Output (no load)

µA

±2

Input Current

V

0.8

Input Low Voltage

V

2.0

Input High 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