MAX14943:5kVRMS Isolated 20Mbps Half-Duplex PROFIBUS DP/RS-485 Transceiver with ±35kV ESD Protection and Integrated Transformer Driver

Industry's Most Robust Isolated RS-485

The MAX14943 isolated RS-485/PROFIBUS DP transceiver provides 5000VRMS (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 reduces noise when there are large differences in ground potential between ports. This device allows for robust communication up to 20Mbps. 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 1/4-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 MAX14943 is available in a 16-pin wide-body SOIC package and operates over the -40°C to +105°C temperature range.

Key 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 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
    • 5kVRMS Withstand Isolation Voltage for 60s (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
MAX14943: Functional Diagram
MAX14943: Functional Diagram
Applications/Uses
  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
DataSheet
titleDownload file
MAX14943 Data SheetMAX14943.pdf
Parametrics
Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)
Package/PinsBudgetary
Price
typminSee Notes
MAX149431Tx + 1RxHalf3.0 to 5.550004.72000035128NoneNo-40 to +105SOIC HYBRID (W)/16$5.20 @1k
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14943GWE+ActiveSOIC HYBRID (W),;16 pin;SOIC H;-40°C to +105°CSee data sheet
MAX14943GWE+TActiveSOIC HYBRID (W),;16 pin;SOIC H;-40°C to +105°CSee data sheet
MAX14943.pdf MAX14943