MAX7318AWG+T

Overview

The MAX7318AWG+T is a 2-wire-interfaced, 16-bit I/O port expander designed for SMBus and I2C applications. It provides 16 configurable input/output ports with an open-drain interrupt output. The device operates within a supply voltage range of 2V to 5.5V and supports clock frequencies up to 400kHz. It features hot-insertion protection, allowing pins to remain high-impedance with up to 6V asserted when powered down. The component includes polarity inversion registers and utilizes three address select pins to configure one of 64 slave ID addresses. It is specified for operation over the -40°C to +125°C automotive temperature range.

Feature Summary

• Supports hot insertion with high-impedance state on all pins during power-down
• Configurable polarity inversion for input data via dedicated registers
• Open-drain interrupt output activates on input state changes
• Includes internal 100kΩ pullups on each I/O pin

Applications

• Servers
• RAID Systems
• Industrial Control
• Medical Equipment
• PLCs

Procurement Notes

Verify the suffix AWG corresponds to the 24-pin Wide SO package and the '+' indicates RoHS compliance before procurement. Confirm that the 'T' suffix denotes tape-and-reel packaging if reel quantity is required. Ensure the ordering information matches the specific package code and temperature range defined in the manufacturer's datasheet.

Selection Notes

Select this component when expanding GPIO capacity for I2C or SMBus systems requiring 16 ports. It is suitable for environments needing hot-swap capability and wide operating voltage ranges. Consider the 24-pin SO package for through-hole or standard surface mount assembly. Verify that the system master can handle the 64 available slave addresses.

Part Context

The MAX7318 belongs to the Maxim Integrated I/O expander family, offering parallel I/O expansion for serial interfaces. It complements other interface ICs by providing additional digital lines without consuming microcontroller pins. The device is part of a broader portfolio including similar expanders with different pin counts or interface types.

Replacement Considerations

Check for direct pin-compatible alternatives within the same product family. Verify that any substitute maintains the 2V to 5.5V operating range and 400kHz interface speed. Ensure the replacement supports hot insertion if required by the application design.