Analog Devices Inc./Maxim Integrated MAX22444CAWE+

Overview

MAX22444CAWE+ from Analog Devices is a reinforced 4-channel digital galvanic isolator with 200Mbps maximum data rate, 5kVRMS withstand voltage (60s), and 1.71V–5.5V dual-supply operation per side. It features unidirectional channel configuration, default-low output state, and high CMTI of 50kV/μs - designed for isolating SPI, RS-485, and industrial I/O interfaces in harsh environments.

For engineers reviewing the MAX22444CAWE+ datasheet, MAX22444CAWE+ pinout, MAX22444CAWE+ application, or MAX22444CAWE+ equivalent, this device supports fast, low-power isolation with reinforced safety certification (UL, cUL, VDE), wide supply range, and precise timing control for real-time industrial communication systems.

Technical Context

The MAX22444CAWE+ implements capacitive-based galvanic isolation with proprietary process technology, enabling signal transfer across isolated power domains while maintaining reinforced insulation integrity. Its architecture supports independent 1.71V–5.5V supplies on both sides, allowing level translation between disparate logic families.

All four channels are unidirectional and always enabled; output default state is fixed low. The device achieves 200Mbps data rate with propagation delay as low as 4.1ns (tPLH, VDD = 4.5–5.5V) and pulse width distortion under 2.0ns, making it suitable for high-speed serial protocols requiring tight timing budgets.

Key Specifications

Pinout & Package

Package: 16-pin wide-body SOIC (8mm creepage/clearance, CTI ≥400, Group II material).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Compared with SI8641ED-B-IS and ISO6741FDWR, the MAX22444CAWE+ delivers 4× higher data rate, 33% higher isolation voltage, and 1.71V minimum supply support - critical for next-generation isolated SPI, battery monitoring, and medical data acquisition where timing precision and safety margins are non-negotiable.

Availability

MAX22444CAWE+ is available at Aetrix Electronics and suitable for industrial automation, battery management systems, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.

Supply support for MAX22444CAWE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The MAX22444–MAX22446 family was engineered to deliver ultra-low-power, high-speed galvanic isolation for next-generation industrial interfaces - specifically targeting SPI, RS-485, and isolated digital I/O where safety, speed, and supply flexibility converge.

FAQ

What is the maximum data rate supported by the MAX22444CAWE+?

The MAX22444CAWE+ supports a maximum data rate of 200Mbps under conditions of 2.25V ≤ VDD ≤ 5.5V. This specification is validated across the full operating temperature range (−40°C to +125°C) and enables high-speed isolation for modern SPI interfaces and real-time industrial communication protocols. At lower supply voltages (1.71V–2.25V), the maximum data rate is reduced to 150Mbps.

Does the MAX22444CAWE+ require external pull-up or pull-down resistors on its input pins?

No, the MAX22444CAWE+ integrates internal input pull-up and pull-down current sources depending on variant - for MAX22444CAWE+, IN_ pins have −5µA pullup current (typical) and no pulldown, eliminating the need for external biasing in most configurations. This simplifies PCB layout and improves reliability in space-constrained designs.

What safety certifications does the MAX22444CAWE+ hold?

The MAX22444CAWE+ is certified to UL1577 (5000VRMS, File E351759), cUL (CSA Bulletin 5A), and VDE 0884-11:2017-1 for reinforced isolation. It meets VIOWM = 1500VRMS continuous, VIOSM = 8000VPK surge, and has CTI ≥400 (Group II material), satisfying stringent requirements for industrial and medical applications.

How does the default-low output behavior of the MAX22444CAWE+ improve system safety?

The MAX22444CAWE+ defaults to low-state outputs when inputs are unpowered or open-circuit - a fail-safe behavior that prevents unintended activation of downstream drivers, relays, or transceivers during power-up, brownout, or fault conditions. This is especially valuable in battery management and motor control systems where false high signals could cause hazardous states.

Can the MAX22444CAWE+ operate with mismatched supply voltages on Side A and Side B?

Yes, the MAX22444CAWE+ supports independent supply rails: VDDA (1.71V–5.5V) and VDDB (1.71V–5.5V) may be set to different voltages, enabling seamless level translation between 1.8V microcontrollers and 3.3V or 5V peripherals without external components - a key advantage in heterogeneous voltage-domain systems.