The MAX7317 is a 10-port SPI-interfaced I/O expander with overvoltage and hot-insertion protection. Its maximum operating voltage is 7V and the maximum operating temperature is -40°C to +125°C.
The MAX7317 is a 10‑port serial‑interfaced I/O expander that operates from 2.25 V to 3.6 V and supports hot insertion. Each port can be configured as an open‑drain output or an over‑voltage‑protected Schmitt input, and the device remains high‑impedance when power is removed.
Key features include 7 V over‑voltage protection on inputs, 20 mA sink capability on outputs, operation from –40 °C to +125 °C, and availability in thin‑QFN (3 mm × 3 mm × 0.8 mm) and QSOP packages. The SPI‑compatible 4‑wire interface runs up to 26 MHz (10 MHz when daisy‑chained).
| Number of I/O ports | 10 |
|---|---|
| Operating supply voltage (V+) | 2.25 V – 3.6 V |
| Maximum output sink current per port | 20 mA |
| Input over‑voltage protection | 7 V |
| Operating temperature range | -40 °C to +125 °C |
The device operates from 2.25 V to 3.6 V.
It provides ten configurable I/O ports (P0‑P9).
The device is rated for operation from –40 °C up to +125 °C.