MAX14939:2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS/RS-485 Transceivers with ±35kV ESD Protection

Industry's Most Robust Isolated RS-485

The MAX14938/MAX14939 isolated RS-485/PROFIBUS-DP transceivers provide 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 reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 20Mbps. An integrated LDO provides a simple and space-efficient architecture for providing power to the cable side of the IC. Each 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 MAX14938/MAX14939 are available in a wide-body 16-pin SOIC package and operate over the -40°C to +105°C temperature range.

Key Features
  • High-Performance Transceiver Enables Flexible Designs
    • Integrated LDO for Cable-Side Power
    • Compliant with RS-485 EIA/TIa-485 Standard
    • 20Mbps Maximum Data Rate
    • Allows Up to 128 Devices on the Bus
  • Integrated Protections Ensures Robust Communication
    • ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • 2.75kVRMS Withstand Isolation Voltage for 60s (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
MAX14938, MAX14939: Functional Diagram
MAX14938, MAX14939: Functional Diagram
Applications/Uses
  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
DataSheet
titleDownload file
MAX14938-MAX14939 Data SheetMAX14938-MAX14939.pdf
Parametrics
Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Rx/Tx on BusOper. Temp.
(°C)
Package/PinsBudgetary
Price
typminSee Notes
MAX149381Tx + 1RxHalf5275042000035128-40 to +105SOIC HYBRID (W)/16$3.65 @1k
MAX14939SOIC HYBRID (W)/16
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14939GWE+ActiveSOIC HYBRID (W),;16 pin;SOIC H;-40°C to +105°CSee data sheet
MAX14939GWE+TActiveSOIC HYBRID (W),;16 pin;SOIC H;-40°C to +105°CSee data sheet
MAX14938-MAX14939.pdf MAX14939