PCA9673DB,118

I/o Expanders Overview

The PCA9673DB,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with interrupt and reset capabilities. It operates within a supply voltage range of 2.3 V to 5.5 V and supports I2C clock frequencies up to 1 MHz. The device features 16 quasi-bidirectional I/O pins that default to inputs at power-up, providing latched outputs with a 25 mA sink capability per pin and a total package sink capacity of 400 mA. It includes an active LOW open-drain interrupt output and allows for 16 programmable slave addresses using two address pins.

I/o Expanders Feature Summary

• Provides general purpose remote I/O expansion via a two-line bidirectional I2C bus interface compliant with Fast-mode Plus speeds.
• Features latched outputs capable of directly driving LEDs with high current drive requirements.
• Includes an active LOW open-drain interrupt line to notify microcontrollers of port data changes without continuous bus communication.
• Supports hardware reset functionality and internal Power-On Reset initialization.

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Medical equipment
• Programmable Logic Controllers (PLCs)

I/o Expanders Procurement Notes

Verify the specific ordering suffix against official NXP documentation to confirm the SO24 package type and reel packaging configuration. Ensure compatibility with system voltage levels and I2C bus timing requirements before integration. Confirm component authenticity through authorized distribution channels.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices to achieve higher I2C bus speeds and increased drive capabilities. Consider the 16-bit port count and interrupt functionality for applications requiring efficient microcontroller resource management. Evaluate the SO24 package dimensions against available PCB real estate constraints.

I/o Expanders Part Context

The PCA9673 series belongs to NXP's Fast-mode Plus family of I/O expanders. It serves as a drop-in upgrade for legacy PCF8575 components, offering improved performance metrics such as faster bus speeds and higher current handling. The DB suffix specifically denotes the SO24 plastic small outline package variant within this product family.

I/o Expanders Replacement Considerations

The PCA9673 is designed as a direct replacement for the PCF8575. Verify that the target application can accommodate the different address mapping and the presence of the RESET input pin instead of the A2 address pin found in the legacy component.