PCA9554D,112

I/o Expanders Overview

The PCA9554D,112 is an 8-bit I/O expander designed for I2C-bus and SMBus applications. 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 features five hardware address pins (A0-A2) allowing multiple units on a single bus. It includes an open-drain interrupt output that activates when input states change. The component utilizes an SO16 package with dimensions of 7.5 mm width and operates across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion
• Features active LOW interrupt output triggered by input state changes
• Includes polarity inversion register for flexible logic level handling
• Integrates noise filters on SCL/SDA inputs to suppress glitches

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 current NXP Semiconductors product lines. Ensure the component meets RoHS compliance standards for your target market. Check for any recent production lifecycle updates or obsolescence notices before finalizing procurement plans.

I/o Expanders Selection Notes

Select this component when 8-bit GPIO expansion is required over I2C or SMBus protocols. Consider the 5 V tolerant I/O capability if interfacing with higher voltage subsystems. Evaluate the interrupt functionality needs against the open-drain output structure. Verify that the SO16 package dimensions fit the available PCB real estate constraints.

I/o Expanders Part Context

This part belongs to the PCA9554 family developed to enhance previous I2C bus I/O expanders. It offers improved drive capability and lower supply current compared to legacy counterparts. The device maintains pin-to-pin compatibility with certain PCF8574 series parts but requires software adjustments due to architectural enhancements.

I/o Expanders Replacement Considerations

Public confirmed substitute part numbers include PCA9554AD,112 which shares identical electrical characteristics but utilizes a different fixed I2C bus address configuration.