MAX485ESA SO-8 Transceiver Interface IC

MAX485ESA SO-8 Transceiver Interface IC

The MAX485ESA is a low-power, high-speed transceiver designed for RS-485 and RS-422 serial communication. It is a industry-standard “half-duplex” chip, meaning it contains one driver and one receiver that share the same differential bus pins. Unlike slew-rate-limited versions, the MAX485 is optimized for speed, supporting data transfer rates up to 2.5Mbps. It operates on a single 5V supply and is engineered to maintain high signal integrity over long distances in noisy industrial environments. The MAX485ESA is the quintessential choice for reliable, multi-node wired networking in building automation and factory control systems.

Features

• High-Speed Data Rates: Supports rapid transmissions up to 2.5Mbps, ideal for time-sensitive data exchanges.

• Low Power Consumption: Draws only 120µA to 500µA of supply current, making it suitable for power-efficient embedded designs.

• Failsafe Receiver: Integrated circuitry ensures a logic-high output if the receiver inputs are left open-circuit, preventing “ghost” data.

• Thermal Shutdown Protection: Automatically places driver outputs into a high-impedance state if excessive heat is detected to prevent permanent damage.

• Short-Circuit Limiting: Protects the driver against bus faults or wiring errors that could lead to overcurrent conditions.

Key Points

• A single 5V power supply is all that is required to power the entire IC and its communication bus.

• Allows for up to 32 transceivers to be connected on a single shared bus for complex local area networks.

• The “ESA” suffix indicates a Surface Mount (SOIC-8) package rated for the extended industrial temperature range (-40°C to +85°C).

• Features a common-mode input voltage range of -7V to +12V, allowing it to withstand significant ground potential differences between nodes.

Specifications