MAX7318AAG+

Overview

The MAX7318AAG+ 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 I2C 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 internal pullups on each I/O pin. It is specified for operation over the -40°C to +125°C automotive temperature range and is housed in a 24-pin SSOP package.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific ordering suffix AAG corresponds to the 24-pin SSOP package variant. Confirm that the component meets RoHS compliance requirements as indicated by the '+' suffix. Ensure the supplier provides valid traceability documentation for automotive-grade specifications if required for the application environment.

Selection Notes

Select this component when 16 general-purpose I/O lines are needed with I2C connectivity. The SSOP package is suitable for standard surface-mount assembly processes. Consider the 5.5V overvoltage tolerance on inputs if interfacing with higher voltage logic levels without level shifting. Verify that the system master can handle the 64 available slave ID addresses via AD0-AD2 pins.

Part Context

The MAX7318 series expands I/O capabilities for microcontrollers using a serial interface. The AAG suffix specifically denotes the SSOP-24 package option within the broader MAX7318 family, which also includes SO, TSSOP, and QFN variants. This part is manufactured by Analog Devices / Maxim Integrated and is designed for robust industrial and automotive environments.

Replacement Considerations

Check for direct pin-compatible alternatives such as the PCA9555 or MCP23017, though register maps and electrical characteristics may differ. Verify that any substitute supports the same 2V to 5.5V operating range and hot-insertion requirements.