MXL1535E

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $7.90

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Overview

2500V_RMS 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

The MAX3535E/MXL1535E isolated RS-485/RS-422 full-duplex transceivers provide 2500V_RMS 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.

Applications

Industrial-Control Local Area Networks
Isolated RS-485 Systems
Systems with Large Common-Mode Voltages
Telecommunications Systems

Part Models: 4
1ku List Price: Starting From $7.90

Documentation

Data Sheet 1

MAX3535E-MXL1535E: +3V to +5V, 2500V_RMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection Data Sheet (Rev.0) 05/21/2004

Reliability Data 1

MXL1535E Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MXL1535ECWI+	SOIC_W	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MXL1535ECWI+T	SOIC_W	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MXL1535EEWI+	SOIC_W	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MXL1535EEWI+T	SOIC_W	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

MAX3535E Evaluation Kit

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Features and Benefits

Designed for 2500V_RMS Isolation
1/8 RS-485 Unit Load
1000kbps Full-Duplex RS-485/RS-422 Communication (Configurable for Half Duplex)
+3.0V to +5.5VDC Input Range
Isolated V_CC2 Output
Center-Tapped, Full-Wave Rectifier Output
420kHz Switching Frequency
Undervoltage Lockout (UVLO) and Thermal Shutdown
Low-Cost Integrated-FET H-Bridge Design
Fully Assembled and Tested

Product Details

The MAX3535E evaluation kit (EV kit) is a fully assembled and tested PCB that contains a 2500V_RMS isolated RS-485/RS-422 transceiver with ESD protection. The EV kit circuit features a differential driver and one receiver. The circuit’s receiver is a 1/8 unit load for the RS-485 bus and communicates up to 1000kbps. The MAX3535E fail-safe circuitry and driver slew-rate features are demonstrated and easily reconfigured.

Additionally, the EV kit features an H-bridge DC-DC converter to power the isolated section of the MAX3535E RS-485/RS-422 circuit. Input power to the circuit is supplied by a +3V to +5.5VDC source. This circuit uses a full-wave rectifier on the unregulated output and provides unregulated voltage to the MAX3535E internal, linear low-dropout (LDO) regulator. Using an H-bridge design minimizes input ripple current and radiated noise. Undervoltage lockout (UVLO) and thermal shutdown provide for a robust, isolated RS-485/RS-422 transceiver circuit and power supply. The surface-mount transformer provides up to 2500V_RMS galvanic isolation and the output is powered from a center-tapped, full-wave rectifier circuit to reduce output voltage ripple.

The isolated H-bridge DC-DC converter operation at 420kHz allows the use of ceramic-only output capacitors and a small transformer.

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