General Description

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

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

Applications

   Isolated RS-485 Systems

   Systems with Large Common-Mode Voltages

   Industrial-Control Local Area Networks

   Telecommunications Systems