MAX7322ATE+T

Overview

The MAX7322ATE+T is an I2C port expander featuring four push-pull outputs and four input ports with selectable internal pullups. It operates from a supply voltage of +1.71V to +5.5V, supporting up to 400kHz serial communication. The device includes latching transition detection for inputs, which are overvoltage protected to +6V. Outputs can sink 20mA each. It utilizes AD0 and AD2 inputs to select one of 16 slave addresses. The component is specified over the -40°C to +125°C automotive temperature range and is housed in a 16-pin TQFN package.

Feature Summary

• Four push-pull output ports rated at 20mA sink current
• Four input ports with maskable, latching transition detection
• Input ports overvoltage protected to +6V
• Low standby current of 0.6µA typical

Applications

• Cell Phones
• SAN/NAS
• Servers
• Notebooks
• Satellite Radio

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm lead-free status and RoHS compliance. Confirm the package type matches the required board layout, as this part number corresponds to the TQFN variant. Ensure the address pin configuration aligns with the system's I2C bus requirements before finalizing procurement.

Selection Notes

Select this component when a mix of push-pull outputs and interrupt-capable inputs is required on a single I2C bus. Verify that the system voltage falls within the 1.71V to 5.5V operating range. Consider the 16 available slave addresses if multiple expanders are needed on the same bus line. Check thermal dissipation requirements for the TQFN package in high-temperature environments.

Part Context

The MAX7322 belongs to the MAX7319–MAX7329 family of pin-compatible port expanders. It offers a specific combination of four push-pull outputs and four inputs, distinguishing it from variants like the MAX7320 (eight outputs) or MAX7319 (eight inputs). This family allows designers to maintain consistent footprints while adjusting port configurations for different application needs.

Replacement Considerations

Direct pin-compatible replacements within the same family include the MAX7322AEE+ (QSOP package) or other members of the MAX7319–MAX7329 series if port configurations allow. Verify software compatibility and register mapping when substituting with other devices in the MAX73xx series.