MAX7321 is an 8-channel I/O open-drain output chip launched by Texas Instruments (TI). It can be used to receive and drive sensor analog signals. The maximum working voltage is 5.5V and the working temperature range is -40°C to +125°C.
The MAX7321 is a general‑purpose I2C port expander that provides eight open‑drain I/O pins. Each pin can be used as a logic input or an open‑drain output, supports 20 mA sink current, and is over‑voltage protected to +6 V. The device includes transition‑detection logic that latches input changes and signals them via an INT output.
The part operates from a 1.71 V to 5.5 V supply, supports up to 400 kHz I2C clock frequency, and is qualified for the automotive temperature range of –40 °C to +125 °C. It offers 16‑pin QSOP and TQFN packages, with a total sink capability of 100 mA across all ports and a typical standby current of 0.6 µA.
| Operating Supply Voltage (V+) | 1.71 V to 5.5 V |
|---|---|
| I2C Serial Clock Frequency | 400 kHz |
| Number of Open‑Drain I/O Ports | 8 |
| Sink Current per Port | 20 mA |
| Total Sink Current (all ports) | 100 mA |
| Over‑Voltage Protection | +6 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Standby Current (typical) | 0.6 µA |
The MAX7321 supports an I2C serial clock frequency up to 400 kHz.
The device provides eight open‑drain I/O ports.
It operates from 1.71 V to 5.5 V.
All ports together can sink up to 100 mA.