PCA9554DB,118

I/o Expanders Overview

The PCA9554DB,118 is an 8-bit I2C-bus and SMBus I/O expander manufactured by NXP Semiconductors. It provides General Purpose parallel Input/Output expansion in a 16-lead SSOP package (SOT338-1). The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. Key electrical characteristics include a typical operating supply current of 104 µA at 5.5 V and a standby current as low as 0.25 µA. The I/O pins are 5 V tolerant, and the device features an open-drain interrupt output activated upon input state changes.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion with individual pin configuration for input or output modes.
• Features an active LOW open-drain interrupt output that triggers when any configured input state differs from its register value.
• Includes a polarity inversion register to invert the logic polarity of the input port data.

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix scanning
• LED driver control

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the reel packing method on official distributor catalogs. Confirm the component status, as some sources indicate end-of-life status for this part number. Ensure the SSOP16 package dimensions match the target PCB footprint requirements before finalizing procurement orders.

I/o Expanders Selection Notes

Select the PCA9554DB variant specifically for its SSOP16 package form factor. Choose this model over the PCA9554A series if the fixed I2C address starting with '0100' fits the system bus topology. Verify that the required I/O drive capability and voltage tolerance align with the connected peripheral specifications.

I/o Expanders Part Context

This component belongs to the PCA9554 family of I2C/SMBus I/O expanders. It is designed to enhance previous generations by offering higher drive capability, lower supply current, and smaller packaging options compared to legacy devices like the PCF8574 series. While pin-compatible, software modifications are required due to architectural enhancements.

I/o Expanders Replacement Considerations

The PCA9554ADB,118 serves as a direct replacement if the alternative fixed I2C address is required. Other package variants such as PCA9554D,118 (SO16) or PCA9554PW,118 (TSSOP16) offer functional equivalence with different physical footprints.