MAX14938 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS

MAX14938/MAX14939
EVALUATION KIT AVAILABLE
2.75kV_RMS Isolated 20Mbps Half-Duplex PROFIBUS/
RS-485 Transceivers with ±35kV ESD Protection
General Description
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.
Functional Diagram
VDDA
VLDO
MAX14938
MAX14939
LDO
(PV)
VDDB
SBA⁺
RXD
A
RE
TXD
B
DE
(DEM)
GNDA
GNDB
() MAX14938 only
* MAX14939 only
Benefits and 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
Safety Regulatory Approvals Pending
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
●● VDE 0884-10
Applications
●● Industrial Automation Equipment
●● Programmable Logic Controllers
●● HVAC
●● Power Meters
Ordering Information appears at end of data sheet.
19-8115; Rev 0; 4/16