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MAXM22511

Description
2.5kVRMS, fully isolated RS-485/RS-422 module transceiver + power supply
File Size1MB,23 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAXM22511 Overview

2.5kVRMS, fully isolated RS-485/RS-422 module transceiver + power supply

EVALUATION KIT AVAILABLE
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MAXM22510/MAXM22511
2.5kV
RMS
Complete Isolated RS-485/RS-422
Module Transceiver + Power
Benefits and Features
General Description
The MAXM22510 and MAXM22511 isolated RS-485/
RS-422, full-duplex, transceiver modules provide
2500V
RMS
(60s) of galvanic isolation between the cable-
side (RS-485/RS-422 driver/receiver side) and the UART-
side of the device. An integrated DC-DC powers the
cable-side of the module. No external components are
required.
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 (MAXM22510)
and 25Mbps (MAXM22511).
The MAXM22510/MAXM22511 operate from a single
3.3V supply on the UART-side. An integrated DC-DC
converter generates the 3.3V operating voltage for the
cable-side of the module.
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 MAXM22510/MAXM22511 are available in an LGA
44-pin package and operate over the -40°C to +105°C
temperature range.
Space Saving Solution
• Fully Integrated Module for Compact Design
High-Performance Transceiver Enables Flexible Designs
• Integrated DC-DC for Cable-Side Power
• Compliant with RS-485 EIA/TIA-485 Standard
• 500kbps Maximum Data Rate for the MAXM22510
• 25Mbps Maximum Data Rate for the MAXM22511
• Allows Up to 128 Devices on the Bus
Integrated Protection Ensures for Robust Communication
• ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
• 2.5kV
RMS
Withstand Isolation Voltage for 60
Seconds (V
ISO
)
• 630V
PEAK
Maximum Repetitive Peak-Isolation
Voltage (V
IORM
)
• 445V
RMS
Maximum Working-Isolation Voltage
(V
IOWM
)
• Withstands ±10kV Surge per IEC 61000-4-5
• Thermal Shutdown
Safety Regulatory Approvals
UL According to UL1577
cUL According to CSA Bulletin 5A
Applications
Industrial Automation
Programmable Logic Controllers
HVAC
Power Meters
Building Automation
Functional Diagram
GNDA
DC-DC
MAXM22510
MAXM22511
VRECT
VLDO
Ordering Information
appears at end of data sheet.
VDDA
SD
RXD
RE
DE
TXD
SBA
LDO
VDDB
RS-485
TRANSCEIVER
A
B
Z
Y
GNDA
GNDB
19-100335; Rev 2; 6/19
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