MAX7311AWG+

Overview

The MAX7311AWG+ is a 2-wire-interfaced 16-bit I/O port expander designed for SMBus and I2C applications. It provides 16 configurable input/output ports, polarity inversion registers, configuration registers, and an open-drain interrupt output. The device operates within a supply voltage range of 2V to 5.5V and supports 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 bus timeout functionality to prevent lock-ups and noise filters on SCL/SDA inputs. It 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 maintenance during power-down
• Includes bus timeout mechanism to ensure lock-free serial interface operation
• Provides open-drain interrupt output triggered by input pin state transitions
• Features internal 100kΩ pullups on all I/O ports

Applications

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

Procurement Notes

Verify the specific ordering suffix 'WG' corresponds to the 24-pin Wide SO package variant as listed in the manufacturer's ordering information table. Confirm that the device meets the required automotive temperature range specifications (-40°C to +125°C) for the intended application environment. Ensure compatibility with the system's I2C/SMBus voltage levels and address configuration requirements before finalizing procurement.

Selection Notes

Select this component when 16 general-purpose I/O lines are required with I2C or SMBus connectivity. It is suitable for systems needing hot-swap capability and interrupt-driven input monitoring. Consider the 24-pin SO package constraints regarding board space and thermal dissipation. Verify that the 5V overvoltage tolerant I/Os align with the external circuit voltage levels to avoid damage during operation.

Part Context

The MAX7311 series expands microcontroller I/O capabilities through a serial interface. The AWG suffix specifically denotes the automotive-grade version packaged in a 24-pin Wide Small Outline (SO) format. This variant shares functional compatibility with other members of the MAX7311 family but differs in physical packaging and potentially manufacturing lot traceability standards defined by the supplier.

Replacement Considerations

The MAX7313 is documented as pin and software compatible with the MAX7311. Other potential substitutes include the PCA9535 and PCA9555, which offer similar I2C interfacing and I/O expansion capabilities. Verify register mapping and electrical characteristics against the original design requirements before substitution.