MAX7325AEG+

Overview

The MAX7325AEG+ 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, offers overvoltage protection up to +6V on input pins, and includes latching transition detection for inputs. It is available in a 24-pin QSOP package and specified for the -40°C to +125°C automotive temperature range.

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
• Dynamic slave address selection via AD0 and AD2 inputs allowing 16 unique addresses
• Overvoltage tolerant I/O ports protected to +6V independent of supply voltage

Applications

• Cell Phones
• Servers
• Automotive Systems

Procurement Notes

Verify the ordering suffix 'EG+' indicates a lead-free/RoHS-compliant package. Confirm the specific package type matches the design requirements, as this part number corresponds to the 24-pin QSOP variant. Ensure the application environment falls within the specified -40°C to +125°C operating temperature range.

Selection Notes

Select the MAX7325AEG+ when pin compatibility with the MAX7324, MAX7326, and MAX7327 family is required but a mix of push-pull and open-drain ports is needed. Consider the dynamic address configuration capabilities if multiple devices share the bus without fixed logic connections on address pins.

Part Context

The MAX7325AEG+ belongs to the MAX7319–MAX7329 family of pin-compatible 16-port expanders. It complements variants like the MAX7324 (8 inputs/8 outputs) and MAX7327 (4 I/Os/12 outputs). All family members share identical pinouts, facilitating design upgrades or changes in port configuration without PCB redesign.

Replacement Considerations

Pin-compatible alternatives include the MAX7324, MAX7326, and MAX7327. Verify that the specific port configuration (push-pull vs. open-drain vs. input-only) of the substitute meets the circuit requirements before replacement.

FAQ

How are the power-up default logic states determined?

The power-up states for the I/O ports are determined by the logic levels connected to the AD0 and AD2 address inputs. These inputs also select which internal pullup resistors are enabled.

Can the slave address be changed dynamically?

Yes, the slave address can be configured dynamically during operation by connecting AD0 and AD2 to SDA or SCL lines, rather than fixed V+ or GND levels.

What happens to the interrupt flag after a read operation?

The internal transition flags and the INT output are cleared when the master acknowledges the slave address byte during a read transaction.