MAX7300ANI+

Overview

The MAX7300ANI+ is a serial-interfaced I/O expansion peripheral providing 20 user-configurable ports (P12–P31) in a 28-pin SSOP package. It operates on a 2.5V to 5.5V supply with a maximum shutdown current of 11µA and supports an I²C-compatible interface up to 400kHz. Each port functions as a push-pull output (sinking 10mA, sourcing 4.5mA) or a Schmitt-trigger input with optional internal pullup. Seven ports feature configurable transition detection logic that triggers an interrupt upon logic level changes.

Feature Summary

• Configurable I/O ports supporting push-pull outputs and Schmitt-trigger inputs with selectable internal pullups
• I²C-compatible 2-wire serial interface enabling communication via SDA and SCL lines
• Transition detection capability for seven specific ports generating interrupts on logic state changes

Applications

• White Goods
• Industrial Controllers
• System Monitoring

Procurement Notes

Verify the component matches the exact ordering suffix ANI+, which indicates a lead-free/RoHS-compliant device in a 28-pin SSOP package. Confirm the manufacturer designation corresponds to Analog Devices Inc./Maxim Integrated. Ensure the datasheet revision aligns with the required specifications before finalizing procurement orders.

Selection Notes

Select this model when a 20-port configuration is sufficient, as other variants offer 28 ports. Verify that the application requires an I²C interface rather than SPI, which is provided by the MAX7301 series. Ensure the operating voltage range between 2.5V and 5.5V meets system requirements and that the 28-pin SSOP package fits the PCB layout constraints.

Part Context

The MAX7300ANI+ belongs to the MAX7300 family of compact, serial-interfaced I/O expanders manufactured by Maxim Integrated. This family includes variants with different pin counts and interfaces, such as the 28-port MAX7300AAX and the SPI-based MAX7301. The component serves as a general-purpose GPIO peripheral for microprocessors.

Replacement Considerations

For applications requiring an SPI interface instead of I²C, consider the MAX7301. For designs needing additional constant-current LED drive capability, the pin-compatible MAX6956 is an alternative. Other MAX7300 variants like the MAX7300AAX provide 28 ports in a 36-pin SSOP package.

FAQ

How many slave addresses can be supported on a single bus?

The MAX7300 supports up to 16 unique slave addresses using only two address select pins (AD0 and AD1), allowing multiple devices to share the same I²C interface.

What happens to the port configuration during shutdown mode?

In shutdown mode, all ports are forced to inputs and internal pullup current sources are turned off. However, data in the port and control registers remains unaltered, allowing configuration and output levels to be restored upon exiting shutdown.

Which ports support transition detection?

Seven ports, specifically P24 through P30, feature configurable transition detection logic. These ports can be monitored for changes in logic status, triggering an interrupt if enabled.