MAX7318ATG+

Overview

The MAX7318ATG+ 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 a serial clock frequency up to 400kHz. All I/O pins are overvoltage-tolerant to 5.5V, independent of the supply voltage. The component features hot-insertion protection, allowing high-impedance states when powered down. It includes internal polarity inversion registers and configuration registers to manage pin directions. The ATG suffix indicates a thin QFN package (4mm x 4mm) suitable for space-constrained designs.

Feature Summary

• Supports hot insertion with high-impedance state during power-down
• Configurable 16-bit I/O ports with polarity inversion capability
• Open-drain interrupt output triggered by input state changes
• I2C-compatible serial interface with noise filtering on inputs

Applications

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

Procurement Notes

Verify the ordering suffix 'ATG' corresponds to the 24-pin Thin QFN package (4mm x 4mm). Confirm the '+' suffix indicates lead-free and RoHS compliance as per Maxim Integrated standards. Ensure the operating temperature range matches the automotive specification of -40°C to +125°C required for the application environment.

Selection Notes

Select this component when expanding GPIO capacity via I2C or SMBus in systems requiring hot-swap capabilities. It is suitable for applications needing 16 bidirectional ports with interrupt generation. Consider the 5.5V overvoltage tolerance if interfacing with higher voltage logic levels without external level shifters. Verify that the available slave addresses meet system addressing requirements.

Part Context

The MAX7318 is part of Maxim Integrated's line of 2-wire-interfaced I/O expanders. It shares functional similarities with the MAX7311 and MAX7312 but offers specific hot-insertion protection features. The device utilizes BiCMOS process technology and contains approximately 12,994 transistors. It is designed to replace discrete logic solutions for port expansion in embedded systems.

Replacement Considerations

The MAX7311 is a compatible alternative offering similar functionality with added SMBus timeout support. The MAX7312 provides identical electrical characteristics and pinout compatibility. Verify register mapping and address configurations when substituting these parts to ensure software compatibility.