PCA9554PW/DG,118

I/o Expanders Overview

The PCA9554PW/DG,118 is an 8-bit I2C-bus and SMBus GPIO expander in a TSSOP16 package. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features five registers: Configuration, Input Port, Output Port, Polarity Inversion, and Command byte. It includes an active LOW open-drain interrupt output triggered by input state changes. The fixed I2C address for the PCA9554 variant begins with 0100, allowing up to eight devices on one bus via hardware pins A0-A2. Operating temperature ranges from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion for I2C-bus/SMBus applications
• Features individual I/O configuration allowing each pin to be set as input or output
• Includes an active LOW open-drain interrupt output to notify the system master of input state changes
• Offers polarity inversion capability for the Input Port register data

I/o Expanders Applications

• ACPI power switches
• Sensors and push buttons
• LED control
• Fan control

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'DG' against official NXP documentation, as standard listings typically use '118'. Confirm the package type matches the datasheet's TSSOP16 (SOT403-1) specification. Ensure the fixed I2C address aligns with the PCA9554 family (0100xxxx) rather than the PCA9554A family (0111xxxx). Check for RoHS compliance status if required for your manufacturing process.

I/o Expanders Selection Notes

Select this component when additional GPIOs are needed for systems using I2C communication. It is suitable for designs requiring 5 V tolerant I/Os and low standby current. Consider the PCA9554A variant if a different fixed I2C address base is required to avoid conflicts with existing devices on the same bus line.

I/o Expanders Part Context

This part belongs to the PCA9554/PCA9554A family of 8-bit I/O expanders developed by NXP Semiconductors. It enhances previous generations with higher drive capability, lower supply current, and smaller packaging options like TSSOP16. While pin-to-pin compatible with PCF8574 series devices, software modifications are necessary due to architectural differences in register handling and interrupt logic.

I/o Expanders Replacement Considerations

The PCA9554APW serves as the direct alternative with a different fixed I2C address base (0111 vs 0100). Other packages such as SO16 (PCA9554D) or SSOP16 (PCA9554DB) offer identical functionality but require footprint adjustments.