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Compact, Isolated, Half-Duplex RS-485/RS-422
Transceivers with AutoDirection Control
MAX22025-MAX22028/
MAX22025F-MAX22028F
General Description
Benefits and Features
The
MAX22025-MAX22028/MAX22025F-MAX22028F
● High-Level Integration Reduces Overall Solution Size
• Fully Isolated Half-Duplex RS-485/RS-422
Transceivers
compact isolated RS-485/RS-422 transceivers provide
3.5kV
of digital galvanic isolation between the cable-
RMS
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 0.5Mbps or
16Mbps.
• Compact 8-Pin Wide Body SOIC Package (5.5mm
Creepage)
● Integrated Protection Ensures Robust Communication
• ±10kV ESD (HBM) on Driver Outputs/Receiver
Inputs
• Failsafe Receiver Prevents Fault Transition on
• Receiver Input Short or Open Events (MAX22025F-
MAX22028F)
The
MAX22025-MAX22028/MAX22025F-MAX22028F
feature Maxim’s proprietary AutoDirection control making
these devices ideal for applications such as isolated
RS-485 ports, where the driver input is used in conjunction
with the driver-enable signal to drive the differential bus.
• Withstands 3.5kV
Isolation Voltage for 60
RMS
Seconds (V
)
ISO
• Withstands 630V
Maximum Repetitive Peak-
PEAK
Isolation Voltage (V
• Continuously Withstands 445V
)
IORM
The
MAX22025/MAX22027/MAX22025F/MAX22027F
Maximum
RMS
feature reduced slew rate drivers that minimize EMI and
reduce reflections caused by improper termination of ca-
ble allowing error-free transmission up to 0.5Mbps. The
MAX22026/MAX22028/MAX22026F/MAX22028F driver
outputs are not slew-rate limited, allowing transmit
speeds up to 16Mbps.
Working-Isolation Voltage (V
)
IOWM
● Enables Flexible System Design
• 0.5Mbps Maximum Data Rate with Slew-Rate
Limited Driver (MAX22025/MAX22027/
MAX22025F/MAX22027F)
• 16Mbps Maximum Data Rate (MAX22026/
MAX22028/MAX22026F/MAX22028F)
• AutoDirection Eliminates the Need for DE and RE
Control Signals
The receiver output of the MAX22025/MAX22026/
MAX22025F/MAX22026F does not follow (V -V ) when
A
B
the device is in the driver-enabled state. The receiver
output on the MAX22027/MAX22028/MAX22027F/
MAX22028F always follows (V -V ).
A
B
Safety Regulatory Approvals
● UL According to UL1577
● cUL According to CSA Bulletin 5A
The driver outputs and receiver inputs are protected from
±10kV electrostatic discharge (ESD) to GNDB on the ca-
ble side, as specified by the Human Body Model (HBM).
The
MAX22025-MAX22028/MAX22025F-MAX22028F
are available in a compact 8-pin wide body SOIC package
and operate over the -40°C to +85°C temperature range.
Applications
● Utility Meters
● Industrial Automation Equipment
● Programmable Logic Controllers
● HVAC
19-100636; Rev 8; 3/22
Ordering Information appears at end of data sheet.
© 2022 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2022 Analog Devices, Inc. All rights reserved.
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