MAX7301AAI+

Overview

The MAX7301AAI+ is a serial-interfaced I/O expander providing up to 28 ports in a 28-pin SSOP package. It operates on a 2.5V to 5.5V supply with a maximum clock frequency of 26MHz via an SPI-compatible 4-wire interface. Each port supports push-pull output (sinking 10mA, sourcing 4.5mA) or Schmitt-trigger input with optional internal pullup. Seven ports feature configurable transition detection logic generating an interrupt. The device functions within a temperature range of -40°C to +125°C and includes shutdown mode with a maximum current of 11µA.

Feature Summary

• Configurable push-pull outputs and Schmitt-trigger inputs with selectable internal pullups
• Transition detection logic for seven specific ports with interrupt generation capability
• SPI-compatible 4-wire serial interface supporting daisy-chaining of multiple devices

Applications

• White Goods
• Gaming Machines
• Industrial Controllers
• System Monitoring

Procurement Notes

Verify the component against official Analog Devices documentation to confirm lead-free status and RoHS compliance. Ensure the ordering suffix matches the required package type and temperature rating. Cross-reference pin configurations and register maps before integration to prevent hardware incompatibility.

Selection Notes

Select this model when a 28-pin SSOP footprint is required for 20-port expansion. Consider the MAX7301AAX+ or MAX7301ATL+ if 28 ports are necessary. Verify that the host microprocessor supports the 4-wire SPI protocol and can handle the required voltage levels for reliable communication across the interface.

Part Context

This component belongs to the MAX7301 series of compact, serial-interfaced I/O expanders manufactured by Analog Devices / Maxim Integrated. It serves as a general-purpose GPIO peripheral designed to simplify system architecture by expanding processor I/O capabilities through a standard serial bus without requiring additional dedicated controller pins.

Replacement Considerations

Refer to the MAX7300 data sheet for a pin-compatible I2C-interfaced version. For applications requiring constant-current LED drive capability, consult the MAX6957 data sheet.