MAX7323AEE+

Overview

The MAX7323AEE+ is an I2C serial-interfaced peripheral featuring eight I/O ports, including four push-pull outputs and four open-drain I/Os. It operates from a +1.71V to +5.5V supply voltage with a maximum clock frequency of 400kHz. The device provides 20mA sink current capability for both output types and includes overvoltage protection up to +6V on the open-drain ports. It supports 16 slave addresses via AD0 and AD2 inputs, features latching transition detection, and draws a typical standby current of 0.6µA. The component is specified for operation across the automotive temperature range of -40°C to +125°C.

Feature Summary

• Four push-pull output ports rated at 20mA sink current
• Four open-drain I/O ports rated to 20mA sink current
• I/O ports are overvoltage protected to +6V independent of supply voltage
• Transient changes are latched, allowing detection between read operations

Applications

• Cell Phones
• SAN/NAS
• Servers
• Notebooks
• RAID

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm that the requested part number matches the exact electrical specifications required for the design. Ensure compatibility with the target I2C bus voltage levels and check for any lead-free or RoHS compliance requirements mandated by the application environment.

Selection Notes

Select this component when a mix of push-pull outputs and overvoltage-tolerant open-drain I/Os is required. Verify that the available I2C address space accommodates the sixteen possible configurations determined by the AD0 and AD2 pins. Consider the internal pullup resistor selection logic based on the chosen address configuration to ensure correct power-up states for the connected peripherals.

Part Context

The MAX7323AEE+ belongs to the MAX7319–MAX7329 family of pin-compatible port expanders. It serves as a specialized variant within this group, combining four open-drain I/O ports with latching transition detection and four dedicated push-pull outputs. This configuration distinguishes it from other family members that offer different combinations of input-only, output-only, or mixed port architectures.

Replacement Considerations

The MAX7327 is a software equivalent that combines the functions of the MAX7320 and MAX7323 in a 16-port expander format. For direct pin-compatible replacement within the same 8-port form factor, verify availability of other MAX73xx variants such as the MAX7322 or MAX7321 depending on the specific balance of inputs and outputs needed.