PCA9554PW

I/o Expanders Overview

The PCA9554PW is an 8-bit I2C-bus and SMBus I/O expander manufactured by Texas Instruments, housed in a 16-pin TSSOP package. 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 open-drain outputs capable of sourcing or sinking current, with a typical operating supply current of 104 uA. It includes configuration registers for input/output selection, polarity inversion capabilities, and an interrupt output pin to signal state changes. The component functions reliably across an extended temperature range from -40°C to +85°C.

I/o Expanders Feature Summary

• Provides eight general-purpose parallel input/output pins expandable via I2C/SMBus interface
• Features configurable polarity inversion registers for flexible logic level handling
• Includes an open-drain interrupt output pin to notify the host of input status changes

I/o Expanders Applications

• Embedded systems requiring additional GPIO ports for sensor or button interfacing
• Industrial control panels needing remote I/O expansion over serial buses
• Consumer electronics utilizing low-power microcontroller architectures

I/o Expanders Procurement Notes

Verify the manufacturer marking on the component body to confirm it originates from Texas Instruments rather than NXP Semiconductors, as both produce this part number family. Ensure the suffix matches the specific TSSOP-16 variant required for your PCB footprint. Cross-reference the datasheet revision date to confirm compatibility with your system's timing requirements.

I/o Expanders Selection Notes

Select this model when a surface-mount TSSOP-16 package is preferred over SOIC or SSOP alternatives. Confirm that the open-drain output structure aligns with your load requirements, as it differs from push-pull variants like the PCA9554DW. Verify that the 2.3 V minimum supply voltage meets your system's lowest operating condition.

I/o Expanders Part Context

This component belongs to the PCA9554 series of I/O expanders, which are designed to replace direct parallel connections in I2C-based designs. While functionally similar to the PCF8574 series, it offers enhanced features such as polarity inversion and lower power consumption. The PW suffix specifically denotes the thin-shrink small-outline package (TSSOP) suitable for high-density board layouts.

I/o Expanders Replacement Considerations

The PCA9554PWRG4 is a lead-free version of this component. For different packages, consider the PCA9554DW (SOIC) or PCA9554DBR (SSOP). Note that the TCA9554 series is a newer generation replacement with improved specifications.