MAX7300AAX+

Overview

The MAX7300AAX+ is a serial-interfaced I/O expansion peripheral providing 28 user-configurable ports (P4–P31) in a 36-pin SSOP package. It operates on a 2.5V to 5.5V supply with a maximum clock frequency of 400 kHz over an industrial temperature range of -40°C to +125°C. Each port functions as a push-pull output (sinking 10mA, sourcing 4.5mA) or a Schmitt-trigger input with optional internal pullup. Seven ports support configurable transition detection logic that triggers an interrupt upon logic level changes.

Feature Summary

• Configurable transition detection logic for seven specific ports generates an interrupt signal upon detecting changes in logic levels.

Applications

• White Goods
• Industrial Controllers
• System Monitoring

Procurement Notes

Verify the component against official Analog Devices documentation to confirm pinout compatibility and electrical specifications. Ensure the ordering suffix matches the required lead-free/RoHS-compliant status. Confirm the package type corresponds to the design requirements before finalizing procurement.

Selection Notes

Select this device when a microprocessor requires up to 28 additional I/O lines via a standard I2C-compatible interface. The choice between 20-port and 28-port variants depends on the selected package size. Verify that the application utilizes the four-level addressing scheme to accommodate multiple devices on the same bus if necessary.

Part Context

This component belongs to the MAX7300 series of compact, serial-interfaced I/O expanders manufactured by Analog Devices/Maxim Integrated. The AAX variant specifically denotes the 28-port configuration housed in a 36-pin SSOP package, designed for applications requiring extensive GPIO expansion within a small footprint.

Replacement Considerations

Refer to the MAX7301 data sheet for an SPI-interfaced version. For a pin-compatible expander featuring additional constant-current LED drive capability, consult the MAX6956 data sheet.