PCA9554APW,118

I/o Expanders Overview

The PCA9554APW,118 is an 8-bit I2C-bus and SMBus I/O expander manufactured by NXP Semiconductors. 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 interrupt outputs and includes noise filters on SCL/SDA inputs. It utilizes a TSSOP16 package (SOT403-1) with three hardware address pins (A0, A1, A2). Operating temperatures range from -40 °C to +85 °C. Supply current is typically 104 µA at 5.5 V.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion for I2C-bus/SMBus applications
• Features active LOW interrupt output activated when input state differs from the Input Port register
• Includes polarity inversion register to invert read register polarity
• Contains internal power-on reset and noise filters on serial data lines

I/o Expanders Applications

• ACPI power switches
• Push buttons
• LEDs
• Fans
• Sensors

I/o Expanders Procurement Notes

Verify the part number against official NXP documentation to confirm the specific suffix indicates the TSSOP16 package and reel packing method. Ensure compatibility with system voltage requirements and I2C bus addressing constraints before procurement.

I/o Expanders Selection Notes

Select this component when additional GPIO expansion is required for I2C-based systems. Consider the PCA9554A variant if a different fixed I2C address is needed to allow up to sixteen devices on the same bus compared to eight for the standard PCA9554.

I/o Expanders Part Context

This device belongs to the PCA9554 family of CMOS I/O expanders developed to enhance NXP's I2C bus portfolio. It offers higher drive capability and lower supply current compared to previous generations while maintaining pin-to-pin compatibility with the PCF8574 series, though software changes are required due to enhanced features.

I/o Expanders Replacement Considerations

Public confirmed substitutes include Texas Instruments parts such as TCA9554DWR and TCA9554PWR. Verify electrical specifications and software compatibility before substitution.