PCA9554PW,112

I/o Expanders Overview

The PCA9554PW,112 is an 8-bit I/O expander from NXP Semiconductors designed for I2C-bus and SMBus applications. It provides General Purpose parallel Input/Output expansion in a TSSOP16 package. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an active LOW interrupt output, polarity inversion registers, and noise filters on SCL/SDA inputs. The component includes internal power-on reset functionality and offers ESD protection exceeding 2000 V HBM.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion with individual input/output configuration capabilities
• Features an open-drain interrupt output that activates upon input state changes
• Includes polarity inversion registers to adjust read register polarity
• Supports hardware-selectable I2C addresses via A0, A1, and A2 pins

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED control circuits
• Fan management systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' corresponds to the tube packing method as documented in the official NXP datasheet. Confirm the manufacturer designation matches NXP Semiconductors rather than other licensees. Ensure the part number aligns with the standard marking requirements specified for the TSSOP16 package variant.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expander with interrupt capability is required for I2C or SMBus systems. Consider the 2.3 V to 5.5 V operating range and 400 kHz clock speed. Verify compatibility with existing software drivers, as enhancements over PCF8574 series may require code adjustments per Application Note AN469.

I/o Expanders Part Context

This device belongs to the PCA9554 family of CMOS I/O expanders developed by NXP Semiconductors. It enhances previous generations with higher drive capability, lower standby current, and smaller packaging options like TSSOP16. The family allows multiple devices to share the same bus through address pin configuration.

I/o Expanders Replacement Considerations

PCA9554APW,112 serves as a direct functional alternative with a different fixed I2C address. Other packages such as SO16 (PCA9554D) or SSOP16 (PCA9554DB) offer pin-compatible replacements if form factor changes are acceptable.