MAX485ESA MAX485CSA MAX485 Transceivers IC SOP-8

MAX485ESA MAX485CSA MAX485 Transceivers IC SOP-8 is a high-speed, low-power transceiver designed specifically for RS-485 and RS-422 serial communication. This integrated circuit features a single driver and a single receiver, allowing for robust data transmission over long distances in electrically noisy environments. Furthermore, the device employs a differential signaling method that provides excellent noise immunity and supports multi-point bus configurations. Engineers often select the MAX485 series because it operates from a single 5 V supply while maintaining low supply current. Consequently, this transceiver serves as an ideal solution for power-sensitive industrial applications where reliable data integrity remains a top priority. Therefore, you can seamlessly integrate this SOP-8 package IC into your next project to establish stable, long-range wired communication.

Key Features:

• Half-Duplex Operation: The IC facilitates bidirectional communication over a single twisted pair by switching between transmit and receive modes.
• Reduced Slew-Rate: This version minimizes EMI and reduces reflections caused by improperly terminated cables, ensuring cleaner signal transitions.
• Low Power Consumption: The device draws a very low quiescent current, which significantly extends the battery life of portable remote-sensing equipment.
• Extended Bus Loading: It allows up to 32 transceivers on a single bus, enabling complex multi-drop network architectures.
• Thermal Shutdown Protection: Internal circuitry protects the device against excessive power dissipation and potential short-circuit faults.

Technical Specifications:

• Supply Voltage (V_CC): 4.75 V to 5.25 V
• Maximum Data Rate: 2.5 Mbps
• Common-Mode Input Voltage: −7 V to +12 V
• Input Resistance: ≥ 12 kΩ
• Driver Differential Output: 1.5 V (Minimum) into a 54 Ω load
• Quiescent Current: ≈ 300 µA to 500 µA
• Operating Temperature (ESA): −40°C to +85°C (Industrial Grade)
• Operating Temperature (CSA): 0°C to +70°C (Commercial Grade)

Mechanical Specifications:

• Package Type: SOP-8 (Small Outline Package)
• Mounting Type: Surface Mount Device (SMD/SMT)
• Lead Count: 8 Pins
• Encapsulation: Molded Plastic Case

Dimensions:

• Body Length: ≈ 4.90 mm
• Body Width (Including Leads): ≈ 6.00 mm
• Body Thickness: ≈ 1.50 mm
• Pin Pitch: 1.27 mm (Standard SOP-8)

Pinout and Wiring:

• Pin 1 (RO): Receiver Output. Connect to the UART RX pin of the microcontroller.
• Pin 2 (RE): Receiver Output Enable. Drive this pin low to enable the receiver.
• Pin 3 (DE): Driver Output Enable. Drive this pin high to enable the transmitter.
• Pin 4 (DI): Driver Input. Connect to the UART TX pin of the microcontroller.
• Pin 5 (GND): Ground connection for the circuit.
• Pin 6 (A): Non-inverting Receiver Input and Driver Output.
• Pin 7 (B): Inverting Receiver Input and Driver Output.
• Pin 8 (VCC): Positive Supply Voltage (5 V).

Datasheet Reference:

• Download Maxim Integrated MAX485 Datasheet

Commonly Used in:

• Industrial Control Systems: Establishing reliable links between Programmable Logic Controllers (PLCs) and HMI panels.
• Smart Meters: Handling automated data collection for electricity and water utility meters.
• Building Automation: Facilitating communication between HVAC controllers and security sensors.

Applications:

• Long-Distance Serial Links: Extending UART communication over distances reaching up to 1200 meters.
• DMX512 Lighting Control: Transmitting digital control signals to stage lighting fixtures and dimmers.
• Level Translators: Converting logic-level signals to differential signals for improved noise resistance.

Equivalent Models:

• SN75176: A widely used alternative that offers functional compatibility with standard RS-485 bus protocols.
• ADM485: An Analog Devices equivalent that provides similar differential signaling performance in an 8-pin package.
• SP485: However, check the specific power consumption requirements before substituting this model in high-speed designs.

Package Includes:

• 1 x MAX485 Transceiver IC (SOP-8 Surface Mount)