I²C port expander with 4 GPIOs and interrupt
The Maxim Integrated MAX7327AATG+ is an I²C port expander providing 4 I/O pins configurable as open-drain or push-pull outputs, with a built-in power-on reset (POR) feature. It communicates on the I²C bus at up to 400 kHz (fast-mode) and includes an interrupt output that signals the host MCU when an input changes state. The wide supply range of 1.71V to 5.5V lets it interface directly with 1.8V, 2.5V, 3.3V, or 5V logic families without level shifters.
Supply range and I/O drive capability
The 1.71V minimum supply means this part can run from a single Li-ion cell near end-of-discharge, while the 5.5V maximum covers legacy 5V logic rails. The open-drain output option allows wired-AND connections for shared interrupt lines or multi-slave bus configurations.