PCA9555DB,118

I/o Expanders Overview

The PCA9555DB,118 is a 24-pin CMOS device providing 16-bit General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. It operates within a power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The component features an active LOW open-drain interrupt output and includes polarity inversion registers. It utilizes three hardware address pins (A0, A1, A2) to allow up to eight devices on the same bus. The SSOP24 package version has a maximum operating temperature of +85 °C and a minimum of -40 °C.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual input/output configuration capabilities
• Features an active LOW interrupt output triggered by input state changes
• Includes polarity inversion registers to modify read register data polarity
• Supports multiple devices sharing the same I²C bus via hardware address pins

I/o Expanders Applications

• ACPI power switches
• Sensor interface connections
• Push button expansion
• LED driving circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the ordering suffix ',118' corresponds to the reel packing method in the 13-inch Q1/T1 format as specified in the official documentation. Confirm that the SSOP24 package variant matches the required board space constraints. Ensure the selected part number aligns with the specific marking requirements for surface mount assembly processes.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required over legacy PCF8575 designs due to enhanced drive capability and lower supply current. Verify compatibility with the system's I²C bus speed limits and ensure the 5 V tolerant I/Os match the external signal levels. Consider the SSOP24 package dimensions against available PCB real estate during the design phase.

I/o Expanders Part Context

This device belongs to the PCA9555 series developed to enhance NXP Semiconductors' family of I²C-bus I/O expanders. It maintains pin-to-pin and address compatibility with the PCF8575 but requires software adjustments to utilize its improved features such as higher drive strength and independent I/O configuration.

I/o Expanders Replacement Considerations

Direct pin-compatible replacements include other variants within the PCA9555 family such as PCA9555D,118 or PCA9555BS,118, provided the package type difference is acceptable. Note that while compatible with PCF8575, software modifications are necessary due to functional enhancements.