Features: ` ESD Protection for RS-485 I/O Pins
±15kV-Human Body Model
±8kV-IEC 1000-4-2, Contact Discharge
±15kV-IEC 1000-4-2, Air-Gap Discharge
` Operate from a Single +3.3V Supply- No Charge Pump Required
` Interoperable with +5V Logic
` Guaranteed 12Mbps Data Rate (MAX3485E/MAX3490E/MAX3491E)
` Slew-Rate Limited for Errorless Data Transmission (MAX3483E/MAX3488E)
` 2nA Low-Current Shutdown Mode (MAX3483E/MAX3485E/MAX3486E/MAX3491E)
` -7V to +12V Common-Mode Input Voltage Range
` Full-Duplex and Half-Duplex Versions Available
` Industry-Standard 75176 Pinout (MAX3483E/MAX3485E/MAX3486E)
` Current-Limiting and Thermal Shutdown for Driver Overload ProtectionApplication·Telecommunications
·Industrial-Control Local Area Networks
·Transceivers for EMI-Sensitive Applications
·Integrated Services Digital Networks
·Packet SwitchingPinout
SpecificationsSupply Voltage (VCC).............................................................+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 (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
14-Pin Plastic DIP (derate 10mW/°C above +70°C) ......800mW
Operating Temperature Ranges
MAX34_ _ EC_ _ ...................................................0°C to +70°C
MAX34_ _ EE_ _.................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +150°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.
DescriptionDevices in the MAX3483E family (MAX3483E/MAX3485E/ MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each MAX3485E contains one driver and one receiver. The MAX3483E and MAX3488E 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 MAX3486E transmits up to 2.5Mbps. The MAX3485E, MAX3490E, and MAX3491E transmit at up to 12Mbps. All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air- Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.
Drivers MAX3485E 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 MAX3488E, MAX3490E, and MAX3491E feature full-duplex communication, while the MAX3483E, MAX3485E, and MAX3486E are designed for halfduplex communication.
MAX3485E Data Sheet
