MAX14940

RECOMMENDED FOR NEW DESIGNS

2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS/RS-485 Transceiver with ±35kV ESD Protection and Integrated Transformer Driver

Industry's Most Robust Isolated RS-485

Data Sheet (Rev. 2) Product Selection Table
Viewing:

Overview

  • High Integration Simplifies Designs
    • Integrated LDO for Cable-Side Power Can Also Power External Loads Up to 10mA
    • Integrated Transformer Driver for Power Transfer to Cable-Side Has Up to 80% Efficiency at 150mA Load
  • High-Performance Transceiver Enables Flexible Designs
    • Compliant with RS-485 EIA/TIA-485 and EIA 61158-2 Type 3 PROFIBUS-DP Standards
    • 20Mbps (max) Data Rate
    • Up to 128 Devices on the Bus
  • Integrated Protection for Robust Communication
    • ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • 2.75kVRMS Withstand Isolation Voltage for 60 Seconds (VISO)
    • 630VPEAK Maximum Repetitive Peak Isolation Voltage (VIORM)
    • 445VRMS Maximum Working Isolation Voltage (VIOWM)
    • > 30 Years Lifetime at Rated Working Voltage
    • Withstands ±10kV Surge per IEC 61000-4-5
    • Thermal Shutdown

The MAX14940 isolated RS-485/PROFIBUS-DP transceiver provides 2750VRMS (60s) of galvanic isolation between the cable-side (RS-485 driver/receiver-side) and the UART-side of the device. Isolation improves communication by breaking ground loops and reduced noise when there are large differences in ground potential between ports. This device allows for robust communication up to 20Mbps.

The MAX14940 includes an integrated 450kHz transformer driver for power transfer to the cable-side of the transceiver using an external transformer. An integrated LDO provides a simple and space-efficient way of designing an isolated DC/DC supply.

The MAX14940 includes one half-duplex driver/receiver channel that is fully compliant with both RS-485 and PROFIBUS-DP standards. The receiver is 1/4-unit load, allowing up to 128 transceivers on a common bus.

Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when cable-side or UART-side power supplies are below functional levels.

The driver outputs/receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable-side, as specified by the Human Body Model (HBM).

The MAX14940 is available in a wide body 16-pin SOIC package and operates over the -40°C to +105°C temperature range.

Applications

  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
MAX14940
2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS/RS-485 Transceiver with ±35kV ESD Protection and Integrated Transformer Driver
MAX14940: Functional Diagram
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Safety and Regulatory Compliance 1

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Evaluation Kits

MAX149X2EVKIT

Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

Buy Now View Details

Features and Benefits

  • Operates from a Single 3.3V Supply
  • Terminal Block Connectors for Easy RS-485/ PROFIBUS Evaluation
  • 5000VRMSIsolation for 60s
  • Fully Assembled and Tested
  • Proven PCB Layout

Product Details

The MAX149X2 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the functionality of the MAX14943 isolated RS-485/PROFIBUS transceiver. The EV kit operates from a single 3.3V supply and features an on-board isolated power supply to power the secondary-side of the circuit.

The MAX149X2 EV kit comes with the MAX14943GWE+ installed, but can also be used to evaluate the pin-compatible MAX14940, MAX14946, and MAX14949 ICs.

Applications

  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
MAX149X2EVKIT
Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

Latest Discussions

No discussions on MAX14940 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed