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MAX3535E：+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection

The MAX3535E/MXL1535E isolated RS-485/RS-422 full-duplex transceivers provide 2500VRMS of galvanic isolation between the RS-485/RS-422 side and the processor or control logic side. These devices allow fast, 1000kbps communication across an isolation barrier when the common-mode voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. Isolation is achieved through integrated high-voltage capacitors. The MAX3535E/MXL1535E also feature a 420kHz transformer driver that allows power transfer to the RS-485 side using an external transformer. The MAX3535E/MXL1535E include one differential driver, one receiver, and internal circuitry to send the RS-485 signals and control signals across the isolation barrier (including the isolation capacitors). The MAX3535E/MXL1535E RS-485 receivers are 1/8 unit load, allowing up to 256 devices on the same bus. The MAX3535E/MXL1535E feature true fail-safe circuitry. The driver outputs and the receiver inputs are protected from ±15kV electrostatic discharge (ESD) on the interface side, as specified in the Human Body Model (HBM). The MAX3535E/MXL1535E feature driver slew-rate select that minimizes electromagnetic interference (EMI) and reduces reflections. The driver outputs are short-circuit and overvoltage protected. Other features are hot-swap capability and isolation-barrier fault detection. The MAX3535E operates with a single +3V to +5.5V power supply. The improved secondary supply range of the MAX3535E allows the use of step-down transformers for +5V operation, resulting in considerable power savings. The MXL1535E operates with a single +4.5V to +5.5V power supply. The MXL1535E is a function-/pin-compatible improvement of the LTC1535. The MAX3535E/MXL1535E are available over the commercial 0°C to +70°C and extended -40°C to +85°C temperature ranges.

Key Features 2500VRMS RS-485 Bus Isolation Using On-Chip High-Voltage Capacitors 1000kbps Full-Duplex RS-485/RS-422 Communication +3V to +5.5V Power-Supply Voltage Range (MAX3535E) +4.5V to +5.5V Power-Supply Voltage Range (MXL1535E) 1/8 Unit Receiver Load, Allowing 256 Devices on Bus ±15kV ESD Protection Using HBM Pin-Selectable Slew-Rate Limiting Controls EMI Hot-Swap-Protected Driver-Enable Input Undervoltage Lockout Isolation-Barrier Fault Detection Short-Circuit Protected Thermal Shutdown Open-Line and Shorted-Line Fail-Safe Receiver Inputs

MAX3535E, MXL1535E: Typical Operating Circuit Applications/Uses Industrial-Control Local Area Networks Isolated RS-485 Systems Systems with Large Common-Mode Voltages Telecommunications Systems

DataSheet

Parametrics

Design kits & evaluation modules

• MAX3535EEVKIT

Quality and Environmental Data

• MAX3535E.pdf

Ordering Information