MAX7321AEE+T

Overview

The MAX7321AEE+T is an I2C port expander featuring eight open-drain I/O ports with selectable internal pullups and transition detection. It operates from a +1.71V to +5.5V supply voltage, supporting up to 400kHz serial communication. The device provides latching interrupt outputs for input state changes and allows sixteen slave address configurations via AD0 and AD2 inputs. Each port can sink 20mA and is overvoltage protected to +6V independent of the supply voltage. It functions within an operating temperature range of -40°C to +125°C.

Feature Summary

• Eight open-drain I/O ports capable of sinking 20mA each
• Latching transition detection interrupt output
• Overvoltage protection on all pins to +6V
• Sixteen selectable I2C slave addresses

Applications

• Cell phones
• Servers
• Notebooks
• SAN/NAS systems
• Satellite radio

Procurement Notes

Verify component authenticity through official Analog Devices channels or authorized distributors. Confirm RoHS compliance and lead-free status indicated by the plus suffix. Ensure the QSOP-16 package matches the design requirements. Check for any specific handling precautions related to electrostatic discharge during storage and assembly.

Selection Notes

Select this part when eight bidirectional open-drain ports are required with hardware-level transition detection. Verify that the I2C bus speed supports up to 400kHz. Ensure the system voltage falls within the 1.71V to 5.5V range. Consider the 16-address capability if multiple expanders share the same bus lines.

Part Context

This component belongs to the MAX7319–MAX7329 family of pin-compatible port expanders. It specifically offers open-drain I/O functionality, distinguishing it from push-pull or input-only variants in the series. The MAX7321AEE+T utilizes a 16-pin QSOP package and meets automotive temperature specifications for broader environmental reliability.

Replacement Considerations

Direct pin-compatible replacements within the same family include the MAX7328 and MAX7329, though these lack latching interrupts. Other family members like the MAX7320 or MAX7322 offer different output types such as push-pull or mixed configurations.