MAX7321ATE+

Overview

The MAX7321ATE+ is an I2C port expander featuring eight open-drain I/O ports with selectable internal pullups and transition detection. It operates from a supply voltage of +1.71V to +5.5V and supports a 400kHz serial interface. The device provides latching interrupt output for input state changes, allowing detection of transient events between read operations. Each open-drain output can sink up to 20mA and is overvoltage protected to +6V independent of the supply voltage. The part is specified over the automotive temperature range of -40°C to +125°C and is available in 16-pin TQFN packages.

Feature Summary

• Eight open-drain I/O ports with selectable internal pullup resistors
• Latching transition detection interrupt for monitoring input state changes
• Overvoltage protection on all I/O ports to +6V independent of supply voltage
• Configurable slave address selection via AD0 and AD2 inputs

Applications

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

Procurement Notes

Verify the package marking code ADC to confirm the TQFN-EP variant. Ensure the ordering suffix matches the lead-free/RoHS-compliant specification. Confirm the operating temperature range covers the required automotive limits of -40°C to +125°C for the specific application environment.

Selection Notes

Select this component when eight bidirectional open-drain ports are required with hardware-level transition detection. It is suitable for applications needing level shifting between different logic voltages due to the +6V tolerant inputs. Consider the family comparison if push-pull outputs or different pin counts are needed instead.

Part Context

The MAX7321 is part of the MAX7319–MAX7329 family of pin-compatible port expanders. It specifically offers eight open-drain I/O ports, distinguishing it from input-only (MAX7319) or push-pull output (MAX7320) variants. It shares the same 16-pin footprint as other family members, facilitating design flexibility across different I/O configuration requirements.

Replacement Considerations

Public confirmed substitute part numbers include MAX7328 and MAX7329 within the same family.