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MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kV Digital Isolators
RMS
General Description
Benefits and Features
● Reinforced Galvanic Isolation for Fast Digital Signals
The MAX22344–MAX22346 are reinforced, fast, low-
power 4-channel digital galvanic isolators using Maxim’s
proprietary process technology. These devices transfer
digital signals between circuits with different power
domains, using as little as 0.74mW per channel at 1Mbps
(1.8V supply). All of the devices in the family feature
reinforced isolation for a withstand voltage rating of
• Up to 200Mbps Maximum Data Rate
• Withstands 3.75kV
for 60s (V
)
RMS
ISO
• Continuously Withstands 784V
• Withstands ±10kV Surge between GNDA and
GNDB with 1.2/50μs waveform
(V
)
RMS IOWM
• High CMTI (50kV/μs, Typical)
3.75kV
for 60 seconds.
● Low Power Consumption
RMS
• 0.74mW per Channel at 1Mbps with V
= 1.8V
= 3.3V
DD
The MAX22344–MAX22346 family offers all possible
unidirectional channel configurations to accommodate
any 4-channel design, including SPI, RS-485, and digital
I/O applications. Output enable for the A side of the
MAX22345R/S is active-low, making them ideal for isolating a
port on a shared SPI bus since the CS signal can directly
enable the MISO signal on the isolator. All other output
enables in the MAX22344–MAX22346 family are the
traditional active-high.
• 1.4mW per Channel at 1Mbps with V
DD
• 3.2mW per Channel at 100Mbps with V
= 1.8V
DD
● Options to Support a Broad Range of Applications
• 2 Maximum Data Rates (200Mbps, 25Mbps)
• 3 Direction Configurations
• Active-High or Active-Low Enable Inputs
• Pin-Selectable Output Default States (High/Low)
Devices are available with a maximum data rate of either
25Mbps or 200Mbps, and feature a selectable default state
for the outputs. The default is the state the output assumes
when the input is either not powered or is open-circuit. See
the Ordering Information and Product Selector Guide for
suffixes associated with each option. Independent 1.71V
to 5.5V supplies on each side of the isolator also make the
devices suitable for use as level translators.
Applications
● Isolated SPI Interface
● Fieldbus Communications for Industrial Automation
● Isolated RS-485/RS-422, CAN
● Battery Management
● Medical Systems
Safety Regulatory Approvals (Pending)
● UL According to UL1577
All of the devices in the MAX22344–MAX22346 family are
available in a 20-pin SSOP package with 5.5mm of creepage and
clearance. All devices are rated for operation at ambient
temperatures of -40°C to +125°C.
● cUL According to CSA Bulletin 5A
● VDE 0884-11 Reinforced Isolation
Ordering Information and Product Selector Guide appear at
end of data sheet.
19-100265; Rev 2; 2/19