MAX7321ATE+T

Overview

The MAX7321ATE+T is an I2C serial-interfaced peripheral featuring eight open-drain I/O ports with selectable internal pullups and transition detection. It operates from a +1.71V to +5.5V supply voltage, supporting up to 400kHz I2C communication. Each port can function as a logic input or an open-drain output rated to sink 20mA. The device includes latching transition detection for inputs, indicated by an open-drain INT output. Address selection via AD0 and AD2 allows for 16 unique slave addresses. It is specified over the automotive temperature range of -40°C to +125°C and is available in a 16-pin TQFN package.

Feature Summary

• Eight open-drain I/O ports capable of sinking 20mA each
• I/O ports are overvoltage protected to +6V independent of supply voltage
• Latching transition detection alerts on input state changes via INT output
• Selectable internal pullup resistors and configurable power-up default logic states

Applications

• Cell Phones
• SAN/NAS
• Servers
• Notebooks
• Satellite Radio

Procurement Notes

Verify the specific ordering suffix 'ATE+' corresponds to the lead-free/RoHS-compliant 16-pin TQFN-EP package variant. Confirm that the tape-and-reel packaging matches the 'T' designation in the part number. Ensure compatibility with the required operating temperature range of -40°C to +125°C for your application environment.

Selection Notes

Select this component when pin-compatible alternatives within the MAX7319–MAX7329 family are insufficient. Choose the MAX7321 specifically for its combination of open-drain outputs and latching interrupt capabilities. Consider the address mapping requirements if multiple devices share the same I2C bus, utilizing AD0 and AD2 connections to SDA, SCL, V+, or GND.

Part Context

The MAX7321 is part of the MAX7319–MAX7329 family of pin-compatible port expanders. It serves as the I/O version within the 8-port expander group, distinct from input-only (MAX7319) or push-pull output-only (MAX7320) variants. It shares the same physical footprint and pinout as other family members to facilitate design flexibility across different product lines.

Replacement Considerations

Pin-compatible substitutes include MAX7319, MAX7320, MAX7322, and MAX7323. Verify functional differences such as output type (open-drain vs. push-pull) and interrupt masking capabilities before substitution.