PCA9674N,112

I/o Expanders Overview

The PCA9674N,112 is an 8-bit I/O expander from NXP Semiconductors designed for remote general-purpose input/output expansion via the I²C bus. It operates within a voltage range of 2.3 V to 5.5 V and supports I²C Fast-Mode Plus speeds up to 1 MHz. The device features latch outputs with 25 mA sink capability per pin and a total package sink current of 200 mA, enabling direct LED driving. It includes a low-active interrupt output and allows for 64 programmable slave addresses using three address pins. The component is housed in a SO16 package.

I/o Expanders Feature Summary

• Provides 8-bit remote I/O expansion compatible with standard and fast-mode I²C buses
• Features high-drive SDA pin capable of handling 30 mA sink current for large bus capacitance
• Includes latch outputs with 25 mA drive strength suitable for direct LED control
• Supports hardware or software reset initialization to default input state

I/o Expanders Applications

• LED signage and display systems requiring PWM dimming support
• Industrial control panels and PLC remote I/O modules
• Medical equipment interface circuits
• Server infrastructure management ports

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to confirm package type and tape/reel specifications. Confirm end-of-life status and availability through authorized distributors before finalizing design-in decisions. Ensure compatibility with existing PCB footprints for the SO16 package variant.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8574 devices to gain higher bus speed and drive capabilities. Consider the 64 available address combinations if multiple expanders are required on a single bus without external buffering. Evaluate the 2.3 V to 5.5 V operating range against system power rails.

I/o Expanders Part Context

This part belongs to the PCA967x family of I²C-bus controlled 8-bit I/O expanders. It serves as a direct upgrade replacement for the PCF8574 series, offering improved performance metrics such as increased clock frequency and current drive. The family is designed for applications needing expanded GPIO connectivity over a two-wire serial interface.

I/o Expanders Replacement Considerations

The PCA9674A is a functional equivalent within the same family. Verify pinout compatibility and electrical characteristics against legacy PCF8574 designs if migrating from older platforms.