MAX7318ATG+T

Overview

The MAX7318ATG+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 400 kHz. 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 temperature range and is housed in a 24-pin Thin QFN 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 ports

Applications

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

Procurement Notes

Verify the part number suffix against the manufacturer's current ordering information to confirm the specific package type and tape-and-reel configuration. Ensure the procurement source provides documentation confirming compliance with RoHS standards and the automotive temperature grade specifications required for the application environment.

Selection Notes

Select this component when 16 general-purpose I/O lines are required alongside interrupt capabilities and hot-swap support. Verify that the system master can accommodate the 7-bit slave addressing scheme and that the 2V to 5.5V supply range aligns with the target board voltage. Confirm that the 4mm x 4mm QFN footprint fits the available PCB area.

Part Context

The MAX7318 belongs to the Maxim Integrated I/O expander family, offering 16-bit expansion via a serial interface. It is functionally similar to the PCA9555 but includes additional features such as hot-insertion protection and polarity inversion. The ATG variant specifically denotes the thin QFN package option within the broader MAX7318 product line.

Replacement Considerations

The MAX7311 is a related device in the same family but lacks certain features found in the MAX7318. Direct pin-compatible replacements from other manufacturers should be evaluated carefully regarding voltage tolerance and interrupt logic compatibility.