MAX14946

RECOMMENDED FOR NEW DESIGNS

2.75kV_RMS Isolated 500kbps Half-Duplex RS-485/RS-422 Transceiver with ±30kV ESD Protection and Integrated Transformer Driver

Industry's Most Robust Isolated RS-485

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.53

Viewing:

Overview

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
- 2.75kV_RMS Withstand-Isolation Voltage for 60s (V_ISO)
- 630V_PEAK Maximum Repetitive Peak-Isolation Voltage (V_IORM)
- 445V_RMS Maximum Working-Isolation Voltage (V_IOWM)
- > 30 Years Lifetime at Rated Working Voltage
- Withstands ±10kV Surge per IEC 61000-4-5
- Thermal Shutdown

The MAX14946 isolated RS-485/RS-422 transceiver provides 2750V_RMS (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 MAX14946 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

Part Models: 2
1ku List Price: Starting From $4.53

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
MAX14946EWE+	16-SOIC_W-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX14946EWE+T	16-SOIC_W-300_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

Evaluation Kits

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
5000V_RMSIsolation 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