MAX14852 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex

MAX14852/MAX14854
EVALUATION KIT AVAILABLE
2.75kV_RMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers
with ±35kV ESD Protection
General Description
The MAX14852/MAX14854 isolated RS-485/RS-422
transceivers provide 2750V_RMS (60s) of galvanic isola-
tion 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. These devices allow for robust
communication up to 500kbps (MAX14852) or 25Mbps
(MAX14854).
The devices include one drive channel and one receive
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 and receiver inputs are protected
from ±35kV electrostatic discharge (ESD) to GNDB on
the cable side, as specified by the Human Body Model
(HBM).
The MAX14852/MAX14854 are available in a wide-body
16-pin SOIC package and operate over the -40°C to
+105°C temperature range.
Functional Diagram
VDDA
SBA
RXD
RE
TXD
DE
VLDO
MAX14852
MAX14854
LDO
VDDB
A
B
Z
Y
Benefits and Features
●● High-Performance Transceiver Enables Flexible Designs
• Integrated LDO for Cable Side Power
• Compliant with RS-485 EIA/TIA-485 Standard
• 500kbps (MAX14852)/25Mbps (MAX14854) Maximum
Data Rate
• Allows Up to 128 Devices on the Bus
●● Integrated Protection Ensures for Robust Communication
• ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
• 2.75kV_RMS Withstand Isolation Voltage for 60
Seconds (V_ISO)
• 630VPEAK Maximum Repetitive Peak-Isolation
Voltage (V_IORM)
• 445VRMS Maximum Working-Isolation Voltage
(V_IOWM)
• > 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
19-7965; Rev 0; 11/15