MAX7318AAG+T

Overview

The MAX7318AAG+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 a maximum clock frequency of 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 internal pullups on each I/O. It is specified for operation over an extended temperature range from -40°C to +125°C.

Feature Summary

• Supports hot insertion with high-impedance state during power-down
• Configurable polarity inversion for input data
• Open-drain interrupt output activated by input state changes
• Internal 100kΩ pullup resistors on all I/O ports

Applications

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

Procurement Notes

Verify the package code matches the SSOP-24 configuration required for this specific part number. Confirm that the ordering suffix indicates tape and reel packaging rather than tube. Ensure the manufacturer designation aligns with Analog Devices or Maxim Integrated specifications. Cross-reference the date code against current production status to avoid obsolete stock.

Selection Notes

Select this component when 16 general-purpose I/O lines are required in a compact surface-mount package. The SSOP-24 form factor suits designs with limited board space. Verify that the system master supports the standard I2C protocol at speeds up to 400kHz. Ensure the application environment remains within the specified -40°C to +125°C operating temperature range.

Part Context

This device belongs to the MAX7318 series of I/O expanders. It shares functional similarities with other Maxim Integrated GPIO peripherals but offers specific hot-swap capabilities. The AAG suffix denotes the SSOP-24 package variant. Other variants in the family include SO, TSSOP, and QFN packages, providing flexibility for different PCB layout constraints.

Replacement Considerations

Direct pin-to-pin replacements may include other 16-bit I2C expanders from manufacturers like NXP or Texas Instruments. Verify register compatibility and interrupt logic before substitution. Check if alternative devices support the same hot-insertion voltage tolerance and standby current requirements.