MAX7312ATG+T

Overview

The MAX7312ATG+T is a 2-wire-interfaced 16-bit I/O port expander designed for SMBus and I2C applications. It provides 16 configurable input/output pins that default to inputs upon power-up, with three address select pins enabling 64 unique slave ID addresses. The device operates within a supply voltage range of 2V to 5.5V and supports a maximum clock frequency of 400 kHz. It features an open-drain interrupt output, bus timeout functionality for lock-up-free operation, and noise filters on the SCL and SDA inputs. The component is housed in a 24-pin Thin QFN package (4mm x 4mm) and is specified for operation across an extended temperature range of -40°C to +125°C.

Feature Summary

• Supports hot insertion with high-impedance state maintained up to 6V during power-down
• Includes polarity inversion registers for flexible input data configuration
• Features bus timeout mechanism to prevent serial bus lock-ups
• Provides low standby current consumption typical of 2.9µA

Applications

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

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature grade. Ensure the procurement channel sources genuine Analog Devices or Maxim Integrated components. Confirm RoHS compliance status matches project requirements. Validate that the received part number corresponds exactly to the 24-pin Thin QFN variant specified in the datasheet.

Selection Notes

Select this component when 16 general-purpose I/O lines are required alongside I2C compatibility. Consider the 5V overvoltage tolerant I/Os if interfacing with higher voltage logic levels while operating at lower supply voltages. Evaluate the availability of the Thin QFN package against board space constraints compared to SO or TSSOP alternatives within the same family.

Part Context

The MAX7312 belongs to the MAX7312 series of 2-wire-interfaced expanders. It shares functional similarities with the MAX7311 but lacks integrated pullup resistors. Other variants in the lineup include the MAX7312AWG (Wide SO), MAX7312AAG (SSOP), and MAX7312AUG (TSSOP), offering different packaging options for the same core functionality.

Replacement Considerations

Direct pin-compatible replacements within the same package include MAX7312AWG, MAX7312AAG, and MAX7312AUG. Verify register mapping and electrical characteristics before substituting with other I/O expanders from different manufacturers.