MAX7326AEG+T

Overview

The MAX7326AEG+T is a 2-wire serial-interfaced peripheral featuring 16 I/O ports, including 12 push-pull outputs and four input ports with selectable internal pullups. It operates from a +1.71V to +5.5V supply voltage and supports a 400kHz I2C interface. The device provides overvoltage protection on inputs up to +6V and includes latching transition detection with an interrupt output. It is specified for the -40°C to +125°C automotive temperature range and is available in a 24-pin QSOP package.

Feature Summary

• Features 12 push-pull outputs rated at 20mA sink current and four input ports with selectable internal pullups.
• Includes latching transition detection logic that monitors input state changes and asserts an open-drain interrupt output.
• Supports dynamic slave address selection via AD0 and AD2 inputs connected to GND, V+, SDA, or SCL.

Applications

• Cell Phones
• Servers
• Notebooks

Procurement Notes

Verify the component matches the exact part number MAX7326AEG+T. Confirm the manufacturer is Analog Devices Inc./Maxim Integrated. Ensure the package type is 24-pin QSOP. Check for lead-free/RoHS compliance indicated by the '+' suffix. Validate the operating temperature range covers -40°C to +125°C.

Selection Notes

Select this device when 12 push-pull outputs and 4 inputs are required in a pin-compatible family. Consider the MAX7327 if open-drain I/O ports are needed instead of pure inputs. Verify the system requires a 2-wire serial interface and can accommodate the specific slave address configuration options provided by the AD0 and AD2 pins.

Part Context

The MAX7326 is part of the MAX7319–MAX7329 family of pin-compatible port expanders. It shares the same footprint as the MAX7324, MAX7325, and MAX7327, allowing design flexibility without board layout changes. This specific variant offers 12 push-pull outputs and 4 inputs, distinguishing it from other family members with different port configurations.

Replacement Considerations

The MAX7327ATG+ is a pin-compatible alternative within the same family, offering 12 push-pull outputs and 4 open-drain I/O ports instead of pure inputs. Ensure the application can utilize open-drain outputs if substituting with the MAX7327 series.

FAQ

How does the MAX7326 handle power-up default states?

The power-up default states of the 12 push-pull outputs and the enablement of internal pullups on the input ports are determined by the logic levels applied to the AD0 and AD2 address inputs.

What is the function of the RST input?

The active-low RST input clears the serial interface, terminating any ongoing I2C transaction to or from the MAX7326. It forces the device into an I2C STOP condition but does not clear the interrupt output.

Can the MAX7326 detect transient input changes?

Yes, the device continuously monitors input ports for state changes. It uses latching transition detection to flag changes even if they are transient, which can be read through the serial interface.