MAX14941 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – 5kV Isolated 20Mbps Half-Duplex PROFIBUS

MAX14941/MAX14942
EVALUATION KIT AVAILABLE
5kV Isolated 20Mbps Half-Duplex PROFIBUS/
RS-485 Transceivers with ±35kV ESD Protection
General Description
The MAX14941/MAX14942 isolated RS-485/PROFIBUS-DP
transceivers provide 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. 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 MAX14941/MAX14942 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
MAX14941
MAX14942
LDO
VDDB
(PV)
SBA*
RXD
A
RE
TXD
B
DE
(DEM)
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
• 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
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.
GNDA
GNDB
() MAX14941 only
* MAX14942 only
The PROFIBUS PROCESS FIELD BUS logo is a registered
trademark of PROFIBUS and PROFINET International (PI)
19-8116; Rev 0; 11/15