MAX7318AWG+

Overview

The MAX7318AWG+ 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 polarity inversion capabilities and an open-drain interrupt output. The device supports hot insertion, maintaining high impedance on all pins when powered down with up to 6V asserted. It operates within a supply voltage range of 2V to 5.5V and features 5.5V overvoltage-tolerant I/Os. The component is specified for operation from -40°C to +125°C and is housed in a 24-pin Wide SO package.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific suffix AWG corresponds to the 24-pin Wide SO package variant. Confirm that the plus sign indicates lead-free compliance. Ensure the operating environment remains within the specified -40°C to +125°C temperature range. Check that the system bus capacitance does not exceed limits for 400kbps operation. Validate power supply decoupling requirements using a 0.047µF capacitor near the V+ pin.

Selection Notes

Select this component when 16 general-purpose I/O lines are required via a standard two-wire interface. It is suitable for systems needing hot-swap capability without damaging the expander. Consider the 5.5V tolerance if interfacing with higher voltage logic levels while the core operates at lower voltages. The wide industrial temperature range makes it appropriate for harsh environments where standard commercial parts may fail.

Part Context

This device belongs to Maxim Integrated's family of 2-wire-interfaced I/O expanders. It shares functional similarities with the MAX7311 but lacks the SMBus timeout function found in that variant. The MAX7318 offers 64 selectable slave addresses via three address pins, allowing multiple devices on a single bus. It utilizes BiCMOS process technology and contains approximately 12,994 transistors.

Replacement Considerations

The MAX7311 is a compatible alternative if SMBus timeout functionality is required. Other variants such as MAX7318AAG (SSOP), MAX7318ATG (Thin QFN), and MAX7318AUG (TSSOP) offer different package options with identical electrical specifications.