MAX7310AUE+

Overview

The MAX7310AUE+ is an 8-bit I/O port expander with a 2-wire interface, operating from 2.3V to 5.5V. It features a 400kHz clock frequency and operates between -40°C and +125°C. The device includes registers for input/output control, polarity inversion, configuration, and bus timeout. It provides 56 slave ID addresses via AD0-AD2 pins. Standby current is typically 1.7µA. Output sink current reaches up to 30mA at 5.5V. The component is housed in a 16-pin TSSOP package.

Feature Summary

• Configurable 8-bit parallel I/O ports controlled via SMBus or I2C-compatible serial interface
• Bus timeout mechanism prevents lock-up by resetting the serial interface if SCL or SDA remains low beyond specified limits
• Polarity inversion register allows system masters to invert input data logic levels
• I/O0 pin functions as a 5V tolerant open-drain output while other pins support push-pull configurations

Applications

• Servers
• RAID Systems
• Industrial Control
• Medical Equipment
• Instrumentation and Test Measurement

Procurement Notes

Verify the specific ordering suffix 'AUE+' corresponds to the 16-pin TSSOP package variant when sourcing components. Confirm that the device meets the required temperature range specifications of -40°C to +125°C for your intended application environment. Ensure compatibility with the host controller's I2C or SMBus voltage levels before integration into the final design.

Selection Notes

Select this component when an 8-bit expansion is required within a 2.3V to 5.5V supply range. The MAX7310AUE+ is suitable for designs needing polarity inversion capabilities and bus timeout protection against bus locks. Consider the 16-pin TSSOP package constraints regarding board space and thermal dissipation requirements during the initial schematic capture phase.

Part Context

The MAX7310 series belongs to Maxim Integrated's family of 2-wire interfaced I/O expanders. This specific part number denotes the automotive-grade version packaged in a 16-pin Thin Small Outline Package (TSSOP). It shares functional similarities with other variants like the MAX7310ATE (QFN) and MAX7310AEE (QSOP), differing primarily in physical footprint and pinout arrangement.

Replacement Considerations

Direct replacements include MAX7310ATE+ (Thin QFN) and MAX7310AEE+ (QSOP). These alternatives maintain identical electrical characteristics and register maps but require different footprints. Verify pin-to-pin compatibility if substituting directly on existing PCB layouts without redesigning the solder mask.

FAQ

How does the bus timeout feature function?

The bus timeout feature resets the serial bus interface if either SCL or SDA is held low for more than 30ms minimum after the start of a valid serial transfer, preventing system lock-ups.

What is the default state of the I/O pins upon power-up?

All eight I/O pins default to inputs upon power-up. An active-low reset input can also be used to explicitly set the I/Os as inputs.

Can the polarity of input data be inverted?

Yes, the system master can invert the MAX7310 input data by writing to the active-high polarity inversion register.