PCA9554PW,118

I/o Expanders Overview

The PCA9554PW,118 is an 8-bit I2C-bus and SMBus I/O expander manufactured by NXP Semiconductors. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device provides 8 general-purpose parallel input/output pins with individual configuration capabilities. It features an open-drain interrupt output that activates when an input state differs from its corresponding register. The component includes hardware address selection via three pins (A0, A1, A2) to allow multiple devices on the same bus. It is housed in a TSSOP16 package.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion for I2C-bus/SMBus applications
• Features active LOW interrupt output triggered by input state changes
• Includes polarity inversion register for flexible logic operation
• Supports hardware selectable addresses to accommodate up to eight devices per bus

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix matches the required packaging format. Confirm the manufacturer designation aligns with project specifications. Ensure the component meets necessary environmental compliance standards such as RoHS. Check for any automotive qualification requirements if applicable to the target application environment.

I/o Expanders Selection Notes

Select this model for designs requiring 8-bit I/O expansion over standard I2C or SMBus interfaces. Consider the TSSOP16 package constraints for PCB layout. Evaluate the 2.3 V to 5.5 V operating range against system power rails. Verify compatibility with existing controller software due to differences from legacy PCF8574 series devices.

I/o Expanders Part Context

This component belongs to the PCA9554 family of CMOS I/O expanders developed to enhance previous generations. It offers improved drive capability and lower supply current compared to earlier models. The device maintains pin-to-pin compatibility with certain legacy parts but requires software adjustments for full functionality.

I/o Expanders Replacement Considerations

PCA9554APW,118 shares identical electrical characteristics but utilizes a different fixed I2C-bus address.