I²C GPIO expander for space-constrained boards
The Analog Devices MAX7322AEE+ is a 4-bit I²C I/O expander in a 16-QSOP package, designed to add four general-purpose I/O lines to any I²C bus. It runs at 400 kHz Fast-mode clock rate and operates from a 1.7V to 5.5V supply, so it can sit on a 1.8V or 3.3V MCU bus without a level translator. Each I/O can source or sink 20mA, enough to drive a small LED or a relay coil directly. The built-in power-on reset (POR) and interrupt output simplify firmware — the POR forces all outputs to a known state at power-up, and the interrupt pin wakes the host only when an input changes, saving polling cycles in battery-powered gear.
The wide supply range means you can use it on a 5V legacy bus or a 1.8V modern SoC without adding a second regulator. At 1.7V the I²C interface still meets the Fast-mode timing; no clock-stretching workaround needed.
The MAX7322AEE+ ships in a 16-pin QSOP (the supplier device package is 16-QSOP, the industry-standard 16-SSOP with 0.154" body width and 3.90mm width). It is surface-mount only, so plan for reflow or hot-air soldering.
It is ROHS3 compliant.