MAX7312ATG+

Overview

The MAX7312ATG+ is a 2-wire-interfaced 16-bit I/O port expander designed for SMBus and I2C applications. It provides 16 configurable input/output pins, an open-drain interrupt output (INT), and supports hot insertion with high-impedance protection up to 6V on all pins when powered down. The device operates within a supply voltage range of 2V to 5.5V and features a 400kbps serial interface. It includes bus timeout functionality for lock-up-free operation, polarity inversion registers, and noise filters on SCL/SDA inputs. The component is specified over an automotive temperature range of -40°C to +125°C and is housed in a 24-pin Thin QFN package measuring 4mm x 4mm.

Feature Summary

• Supports hot insertion with high-impedance protection on all pins when powered down
• Configurable 16-bit I/O ports with power-on reset defaulting to inputs
• Open-drain interrupt output activates on input state changes
• Bus timeout feature prevents serial bus lock-ups

Applications

• Servers and blades
• RAID systems
• Medical equipment
• Instrumentation and test measurement
• Networking

Procurement Notes

Verify the specific ordering suffix ATG corresponds to the 24-pin Thin QFN package configuration. Confirm that the '+' designation indicates compliance with lead-free manufacturing standards as per Maxim Integrated specifications. Ensure the component meets the required -40°C to +125°C automotive temperature rating for your application environment.

Selection Notes

Select this component when a 16-bit GPIO expansion solution is required with I2C/SMBus compatibility. It is suitable for systems needing hot-swap capability and low standby current. Consider the Thin QFN package constraints regarding thermal dissipation and PCB layout requirements for the exposed pad connection to ground.

Part Context

The MAX7312 series offers multiple package options including Wide SO, SSOP, TSSOP, and Thin QFN. The ATG variant specifically denotes the 24-pin Thin QFN form factor. This family provides general-purpose I/O expansion with integrated interrupt generation and address selection capabilities for multi-device bus configurations.

Replacement Considerations

Consult the MAX7311 datasheet if integrated 100k pullup resistors are required on the I/O lines. Verify pinout and register compatibility before substituting with other I/O expanders from different manufacturers.