PCA9674PW,112

I/o Expanders Overview

The PCA9674PW,112 is an 8-bit remote I/O expander for the Fast-mode Plus (Fm+) I2C bus. It operates between 2.3 V and 5.5 V with 5.5 V tolerant I/Os. The device features a 1 MHz I2C interface, 30 mA SDA sink capability, and latched outputs with 25 mA sink drive for direct LED connection. Total package sink capability is 200 mA. It includes an active LOW open-drain interrupt output, 64 programmable slave addresses via three pins, readable device ID, software reset, and low standby current of 4.5 µA typical.

I/o Expanders Feature Summary

• Fast-mode Plus I2C interface supporting 1 MHz speed
• Latched outputs with 25 mA sink capability for direct LED driving
• Active LOW open-drain interrupt output for input state change notification
• Readable device ID providing manufacturer, part identification, and revision data

I/o Expanders Applications

• LED signs and displays
• Servers
• Key pads
• Industrial control
• Medical equipment

I/o Expanders Procurement Notes

Verify the specific ordering suffix to confirm the TSSOP16 package and bulk tube packing method associated with the ,112 designation. Confirm that the component matches the standard marking requirements specified in the datasheet. Ensure the supply voltage range and temperature specifications align with the target application environment before finalizing procurement.

I/o Expanders Selection Notes

Select this component when high-speed Fm+ I2C communication at 1 MHz is required alongside significant LED drive capabilities. The 64 available address options allow for dense bus configurations without buffers. Consider the 200 mA total package sink limit when designing circuits that activate multiple outputs simultaneously. Verify compatibility with the microcontroller's I2C voltage levels and interrupt handling logic.

I/o Expanders Part Context

The PCA9674 series serves as a high-performance upgrade to legacy PCF8574 devices, offering increased bus speed and drive strength. It belongs to NXP's Fm+ I2C family, designed to support complex embedded systems requiring extensive remote I/O expansion. The PW variant specifically utilizes the TSSOP16 plastic thin shrink small outline package for surface-mount assembly.

I/o Expanders Replacement Considerations

The PCA9674A offers non-overlapping addresses but shares identical electrical characteristics. Legacy PCF8574 or PCA8574 devices are functionally compatible but lack Fm+ speed and higher drive currents. Verify pinout and register compatibility when substituting with other 8-bit I2C expanders.