The MAX7319 is an input port switch chip produced by Texas Instruments. The chip supports I2C communication, has 8 input ports and 1 interrupt output port, and can use internal pull-up resistors to detect the level of the input ports. It also provides pull-up resistor selection function, and overvoltage protection function, which can detect whether the input port voltage is too high. When the input port voltage is too high, the chip will automatically turn off to prevent the input port from burning
The MAX7319 is an I2C‑compatible 8‑port expander with maskable, latching transition detection and over‑voltage protection up to +6 V. It supports selectable internal pull‑ups, hot‑insertion, and provides an interrupt output that flags any input change.
The document provides absolute maximum ratings, detailed electrical characteristics, timing diagrams, pin descriptions, package options (QSOP and TQFN) and a family comparison with related MAX7320‑MAX7329 devices.
| Operating Supply Voltage (V+) | 1.74 V – 5.50 V |
|---|---|
| Serial Clock Frequency | 400 kHz |
| Input Low Voltage | 0.2 × V+ |
| Input High Voltage | 0.8 × V+ |
| Operating Temperature Range | -40 °C to +125 °C |
| Number of Input Ports | 8 |
The device provides eight CMOS input ports.
The MAX7319 operates up to a 400 kHz serial clock frequency.
It can be powered from 1.74 V to 5.50 V.
The device is specified for operation from –40 °C to +125 °C.