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3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers

General Description

The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver.

The MAX3483 and MAX3488 feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps.

The partially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491 transmit at up to 10Mbps.

Drivers are short-circuit current limited and are protected 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 both inputs are open circuit.

The MAX3488, MAX3490, and MAX3491 feature fullduplex communication, while the MAX3483, MAX3485, and MAX3486 are designed for half-duplex communication.

Applications

• Low-Power RS-485/RS-422 Transceivers
• Telecommunications
• Transceivers for EMI-Sensitive Applications
• Industrial-Control Local Area Networks

Features

♦ Operate from a Single 3.3V Supply— No Charge Pump!

♦ Interoperable with +5V Logic

♦ 8ns Max Skew (MAX3485/MAX3490/MAX3491)

♦ Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488)

♦ 2nA Low-Current Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491)

♦ -7V to +12V Common-Mode Input Voltage Range

♦ Allows up to 32 Transceivers on the Bus

♦ Full-Duplex and Half-Duplex Versions Available

♦ Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)

♦ Current-Limiting and Thermal Shutdown for Driver Overload Protection

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V_CC)...............................................................7V

Control Input Voltage (RE, DE) ...................................-0.3V to 7V

Driver Input Voltage (DI).............................................-0.3V to 7V

Driver Output Voltage (A, B, Y, Z)..........................-7.5V to 12.5V

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

Receiver Output Voltage (RO)....................-0.3V to (V_CC + 0.3V)

Continuous Power Dissipation (TA = +70°C)

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW

8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW

14-Pin Plastic DIP (derate 10mW/°C above +70°C) ......800mW

14-Pin SO (derate 8.33mW/°C above +70°C)................667mW

Operating Temperature Ranges

MAX34_ _C_ _.......................................................0°C to +70°C

MAX34_ _E_ _....................................................-40°C to +85°C

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

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

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.

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