MAX7311ATG+T

Overview

The MAX7311ATG+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 (INT). 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 internal 100kΩ pullups on each I/O pin and offers 64 selectable slave ID addresses via AD0–AD2 pins. It is specified for operation from -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 state during power-down
• Configurable polarity inversion for input data
• Bus timeout feature prevents lock-up conditions
• Noise filtering on SCL and SDA inputs

Applications

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

Procurement Notes

Verify the specific suffix 'TG' corresponds to the 24-pin Thin QFN package configuration. Confirm RoHS compliance status as indicated by the '+' designation. Ensure the operating temperature range meets the -40°C to +125°C requirement for automotive or industrial environments. Cross-reference the manufacturer's latest datasheet revision to confirm pinout compatibility and electrical characteristics before finalizing procurement.

Selection Notes

Select this component when 16 general-purpose I/O lines are required with I2C/SMBus connectivity. It is suitable for systems needing hot-swap capability without external pullup resistors due to integrated 100kΩ pullups. Consider the 4mm x 4mm QFN footprint for space-constrained designs. Verify that the 2V to 5.5V supply range aligns with the system power architecture and that the 400kHz interface speed is sufficient for the application latency requirements.

Part Context

The MAX7311 series expands I/O capabilities for microcontrollers using standard two-wire interfaces. The ATG variant specifically denotes the automotive-grade temperature range and the Thin QFN packaging format. This part belongs to Maxim Integrated's portfolio of serial expanders, offering a compact solution for adding parallel I/O ports to serial bus systems in embedded applications.

Replacement Considerations

The MAX7312 is noted as an alternative for applications requiring I/Os without internal pullup resistors. Other variants in the MAX7311 family include AWG (Wide SO), AAG (SSOP), and AUG (TSSOP) packages, which share identical electrical functionality but differ in physical form factor.