MAX7301AAI+T

Overview

The MAX7301AAI+T is a serial-interfaced I/O expander providing up to 28 ports in a 28-pin SSOP package. It operates on a supply voltage of 2.5V to 5.5V with a maximum clock frequency of 26MHz via an SPI-compatible 4-wire interface. The device features configurable push-pull outputs capable of sinking 10mA and sourcing 4.5mA, or Schmitt-trigger inputs with optional internal pullups. Seven ports support transition detection logic that triggers an interrupt output upon logic level changes. The component functions within a temperature range of -40°C to +125°C.

Feature Summary

• Configurable push-pull outputs and Schmitt-trigger inputs with selectable internal pullup resistors
• Transition detection logic for seven specific ports generating active-high interrupt signals
• 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 exact ordering suffix against official manufacturer documentation to confirm lead-free status and RoHS compliance. Ensure the selected package variant matches the required pin count and physical dimensions for the target PCB layout. Cross-reference the datasheet revision date to confirm the accuracy of electrical specifications before finalizing procurement orders.

Selection Notes

Select this component when a microprocessor requires expansion of general-purpose I/O lines through a standard serial bus. The 28-pin SSOP package limits the device to 20 available ports compared to the 28-port variants. Verify that the system power supply remains within the specified 2.5V to 5.5V operating range to ensure proper logic threshold performance and current drive capabilities.

Part Context

This part belongs to the MAX7301 series of compact serial I/O expanders manufactured by Analog Devices / Maxim Integrated. It serves as a GPIO peripheral for microprocessors, offering flexible port configuration options. The family includes variants with different pin counts and packages, such as the 36-pin SSOP and 40-pin TQFN versions, which provide access to all 28 available ports.

Replacement Considerations

The MAX7300 series offers a similar function but utilizes a 2-wire I2C interface instead of the 4-wire SPI interface found in the MAX7301. For applications requiring LED drive capability, the MAX6957 provides a pin-compatible alternative with additional constant-current drivers.