MAX7301AAX+T

Overview

The MAX7301AAX+T is a serial-interfaced I/O expander providing up to 28 ports in a 36-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 internal pullup. Seven ports feature configurable transition detection logic generating an interrupt. The device includes shutdown mode with a maximum current of 11µA and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Configurable push-pull outputs and Schmitt-trigger inputs with selectable internal pullups
• Transition detection logic for seven specific ports with interrupt generation
• SPI-compatible 4-wire serial interface supporting high-speed communication
• Low-power shutdown mode preserving register configuration

Applications

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

Procurement Notes

Verify the component matches the exact part number MAX7301AAX+T, confirming the 36-pin SSOP package and lead-free/RoHS-compliant status indicated by the plus suffix. Ensure the supplier provides documentation verifying the Analog Devices/Maxim Integrated origin and the specific revision level to guarantee compatibility with the intended design specifications.

Selection Notes

Select this component when a microprocessor requires expansion of I/O ports without consuming additional dedicated pins. The 4-wire interface simplifies integration across different architectures. Consider the 28-port capacity and transition detection features if monitoring logic level changes is required. Verify that the operating voltage range aligns with the system power supply constraints.

Part Context

The MAX7301 series includes variants like the MAX7301AAI (20 ports, 28-pin SSOP) and MAX7301ATL (28 ports, 40-pin TQFN). The MAX7301AAX+ specifically denotes the 28-port version in a 36-pin SSOP package. This family serves as a general-purpose GPIO peripheral for expanding digital input and output capabilities in embedded systems.

Replacement Considerations

For I2C interfacing, consider the MAX7300 series. For applications requiring LED drive capability, the MAX6957 is a pin-compatible alternative. Verify pinout and register compatibility before substituting any other I/O expander.