MAX14949
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MAX14949

5kVRMS Isolated 500kbps Half-Duplex RS-485/RS-422 Transceiver with ±30kV ESD Protection and Integrated Transformer Driver

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Industry's Most Robust Isolated RS-485

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
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1ku List Price Starting From $4.54
Features
  • High Integration Simplifies Designs
    • Integrated LDO for Cable-Side Power
    • 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 Standard
    • 500kbps (max) Data Rate
    • Up to 256 Devices on the Bus
  • Integrated Protection for Robust Communication
    • ±30kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • 5kVRMS Withstand-Isolation Voltage for 60 Seconds (VISO)
    • 1200VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)
    • 848VRMS Maximum Working-Isolation Voltage (VIOWM)
    • >30 Years Lifetime at Rated Working Voltage
    • Withstands ±10kV Surge per IEC 61000-4-5
    • Thermal Shutdown
Additional Details
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The MAX14949 isolated RS-485/RS-422 transceiver provides 5000VRMS (60s) of galvanic isolation between the cable side (RS-485/RS-422 driver/receiver side) and the UART side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. This device allows for robust communication up to 500kbps.

The device 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 architecture for providing power to the cable side of the IC.

The device includes one half-duplex driver/receiver channel. The receiver is 1/8-unit load, allowing up to 256 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 ±30kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM).

The MAX14949 is available in a wide body 16-pin SOIC package and operates over the -40°C to +85°C temperature range.

Applications

  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
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Part Models 2
1ku List Price Starting From $4.54
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MAX14949

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Data Sheet

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UPDATED 11/15/2017
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MAX14949: 5kVRMS Isolated 500kbps Half-Duplex RS-485/RS-422 Transceiver with ±30kV ESD Protection and Integrated Transformer Driver Data Sheet (Rev.2)

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UPDATED 03/10/2016
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MAX14949: 5kVRMS絶縁型500kbpsハーフデュプレックスRS-485/RS-422トランシーバ、±30kV ESD保護およびトランスドライバ内蔵 Data Sheet (Rev.0)

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UPDATED 01/28/2016
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UPDATED 01/28/2016
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Documentation

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
MAX14949EWE+ 16-SOIC_W-300_MIL external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
MAX14949EWE+T 16-SOIC_W-300_MIL external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Software & Part Ecosystem

Evaluation Kits 1

MAX149X2EVKIT

Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

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MAX149X2EVKIT

Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

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MAX149X2EVKIT
Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

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
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Product Detail

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

Evaluation Kits1

MAX149X2EVKIT

Evaluation Kit for the MAX14940/MAX14943/MAX14946/MAX14949

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