The MAX7301 is a 20/28-port general-purpose I/O expander chip launched by Texas Instruments. It supports SPI bus control, 2.5V to 5.5V power supply and a working temperature range of -40°C to +125°C. Each port supports logic input and output configuration, and supports 7 ports of logic transition detection.
The MAX7301 is a compact, serial‑interfaced I/O expander that provides microprocessors with up to 20 or 28 GPIO ports, each configurable as a push‑pull output or Schmitt‑trigger input. It operates from 2.5 V to 5.5 V and supports a high‑speed 26 MHz SPI/QSPI/MICROWIRE interface.
The document includes absolute maximum ratings, detailed electrical and timing characteristics, pin descriptions, register maps, shutdown behavior, transition‑detection features, and package information for SSOP, QFN, DIP and other form factors.
| Operating Supply Voltage | 2.5 V to 5.5 V |
|---|---|
| Number of I/O Ports | 20 or 28 ports |
| Output Source Current | 4.5 mA (source) |
| Shutdown Supply Current | 11 pA (max) |
| Operating Temperature Range | -40 °C to +125 °C |
| Serial Interface Speed | 26 MHz |
The device operates from 2.5 V to 5.5 V.
It provides either 20 or 28 configurable I/O ports, depending on the package.
The shutdown current is about 11 pA (maximum).