PCA9554BBSHP

I/o Expanders Overview

The PCA9554BBSHP is a low-voltage 8-bit General Purpose Input/Output (GPIO) expander manufactured by NXP USA Inc. It interfaces with I2C-bus and SMBus systems, providing parallel port expansion for microcontrollers. The device operates within a supply voltage range of 1.65 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an open-drain interrupt output, Schmitt-trigger inputs, and internal weak pull-up resistors on all I/O pins. Packaged in a 16-terminal HVQFN (3x3 mm) format, it functions as a pin-to-pin replacement for the PCA9554 series.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion with individual input/output configuration registers
• Features an open-drain active LOW interrupt output triggered by input state changes
• Integrates internal weak pull-up resistors to eliminate external components
• Includes Schmitt-trigger action on SCL and SDA inputs for improved noise immunity

I/o Expanders Applications

• ACPI power switches
• Sensor interface circuits
• Push button scanning systems
• LED control applications
• Fan control modules

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP indicates the reel pack packing method for surface-mount devices. Confirm that the base part number corresponds to the PCA9554B variant, which utilizes a distinct I2C fixed address compared to the PCA9554C. Ensure the package type matches the required board layout for the HVQFN16 thermal enhanced very thin quad flat package.

I/o Expanders Selection Notes

Select this component when a direct replacement for the legacy PCA9554 is required without software modification. Choose the PCA9554B variant specifically if the system design relies on its fixed hardware I2C address to prevent conflicts with other bus devices. Consider the integrated weak pull-ups if minimizing external passive components is a priority.

I/o Expanders Part Context

This device belongs to the PCA9554 family of low-power I/O expanders developed by NXP Semiconductors. It serves as an enhancement to the original PCA9554 series, offering lower standby current consumption and 5 V tolerant I/Os. The PCA9554B is functionally compatible with the older PCA9554, while the PCA9554C replaces the PCA9554A, allowing up to sixteen devices on a single bus.

I/o Expanders Replacement Considerations

The PCA9554BBSHP is a pin-to-pin replacement for the PCA9554. The PCA9554C variant replaces the PCA9554A. For more advanced features such as Agile I/O, consider the PCAL9554B or PCAL9554C series.