MAX7325AEG+T

Overview

The MAX7325AEG+T is an I2C port expander featuring 16 ports: eight push-pull outputs and eight open-drain I/Os. It operates from a +1.71V to +5.5V supply with a typical standby current of 0.6µA. The device supports 400kHz serial communication and includes latching transition detection for inputs. Open-drain outputs sink up to 20mA, while push-pull outputs drive loads up to V+. Ports are overvoltage protected to +6V. Address selection via AD0/AD2 sets slave addresses and power-up states. It is specified over the -40°C to +125°C automotive temperature range in a 24-pin QSOP package.

Feature Summary

• Eight push-pull outputs and eight open-drain I/O ports with selectable internal pullups
• Latching transition detection interrupt output for continuous input monitoring
• Overvoltage protection on all I/O ports to +6V independent of supply voltage
• Dynamic slave address configuration using SDA/SCL logic levels

Applications

• Servers
• SAN/NAS systems
• Automotive electronics

Procurement Notes

Verify the component matches the specific MAX7325AEG+T designation. Confirm the package type is 24-pin QSOP and that it meets the -40°C to +125°C operating temperature range requirements. Ensure the lead-free/RoHS-compliant status aligns with project specifications before finalizing procurement.

Selection Notes

Select this part when a pin-compatible solution with mixed push-pull and open-drain capabilities is required within the MAX7324–MAX7327 family. It is suitable for applications needing dynamic address configuration and low standby current. Verify that the 20mA sink capability of the open-drain ports meets load requirements.

Part Context

The MAX7325AEG+T belongs to the MAX7319–MAX7329 family of 16-port I2C expanders. It shares pin compatibility with the MAX7324, MAX7326, and MAX7327, which offer different configurations of input and output ports. This specific variant provides eight push-pull outputs and eight open-drain I/Os.

Replacement Considerations

Pin-compatible alternatives include the MAX7324 (8 inputs, 8 push-pull), MAX7326 (4 inputs, 12 push-pull), and MAX7327 (up to 4 I/O, 12 push-pull). Verify functional differences regarding port types and interrupt masking before substitution.

FAQ

How does the MAX7325 handle dynamic address configuration?

The MAX7325 allows dynamic address configuration by connecting the AD0 and AD2 inputs to SDA or SCL lines instead of fixed logic levels. This enables changing the slave address without cycling the device supply.

What is the function of the INT output?

The INT output is an active-low, open-drain signal that alerts the master to state changes on input ports. It is latched, allowing detection of transient changes between read operations, and is cleared upon subsequent access.

Can the open-drain I/O ports be used as inputs?

Yes, any open-drain port can be configured as a logic input by setting its output logic-high, which places the port in a high-impedance state. Transition detection remains active for these ports.