MAX7319AEE+T

Overview

The MAX7319AEE+T is an I2C port expander featuring eight input ports with maskable, latching transition detection and interrupt output. It operates from a +1.71V to +5.5V supply voltage with a typical standby current of 0.6µA. The device supports a 400kHz serial interface and provides overvoltage protection up to +6V on all pins. It offers 16 selectable slave addresses via AD0 and AD2 inputs and includes internal pullup resistors. The component is specified for the automotive temperature range of -40°C to +125°C and is housed in a 16-pin QSOP package.

Feature Summary

• Eight input ports with selectable internal pullups and overvoltage protection to +6V
• Maskable, latching transition detection with interrupt output for transient change monitoring
• Four-level logic address selection allowing 16 unique I2C slave addresses
• Supports hot insertion with high-impedance state during power-down

Applications

• Cell phones
• SAN/NAS systems
• Servers
• Notebooks
• Satellite radio

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status as indicated by the plus sign in the part number. Ensure the supplier provides valid traceability documents for automotive-grade components. Cross-reference the manufacturer's latest datasheet revision to validate pinout and electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring eight digital inputs with hardware-based transition detection to reduce processor overhead. It is suitable for applications needing level translation between different logic voltages due to its +6V tolerance. Consider the 16-address capability if multiple devices share a single I2C bus. Verify that the operating voltage range aligns with the system's power supply rails and that the QSOP package fits the available PCB footprint.

Part Context

The MAX7319 is part of a family of pin-compatible port expanders from Analog Devices/Maxim Integrated. It serves as an input-only variant within the series, contrasting with models offering open-drain or push-pull outputs. This specific device focuses on versatile automatic input monitoring capabilities, providing maximum flexibility for detecting both permanent and transient signal changes across multiple channels.

Replacement Considerations

The MAX7328 and MAX7329 are documented as second sources to the PCF8574 and PCF8574A respectively, but direct pin-to-pin replacement with other MAXIM parts requires verifying output configurations. The MAX7321 offers similar input features but includes open-drain I/O ports. Ensure any substitute maintains the required transition detection and interrupt masking functionality.