PCA9554ABS3,118

I/o Expanders Overview

The PCA9554ABS3,118 is an 8-bit I/O expander from NXP Semiconductors designed for I2C-bus and SMBus applications. It provides General Purpose parallel Input/Output expansion in a 16-pin HVQFN package (SOT758-1) with dimensions of 3 x 3 x 0.85 mm. 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 features include 5 V tolerant I/Os, an active LOW interrupt output, and polarity inversion registers. All I/O pins default to inputs at reset, and the device includes internal power-on reset and noise filters on SCL/SDA inputs.

I/o Expanders Feature Summary

• Provides 8 bits of GPIO expansion compatible with I2C-bus and SMBus protocols
• Features an open-drain interrupt output activated by input state changes
• Includes polarity inversion register for flexible logic level handling
• Offers hardware-selectable addresses via A0, A1, and A2 pins

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button scanning
• LED control systems
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the ordering suffix '118' corresponds to the specified reel packing method and standard marking requirements. Confirm that the HVQFN16 package variant matches the design footprint. Ensure compliance with RoHS directives and check for any specific automotive qualification requirements if applicable to the target application environment.

I/o Expanders Selection Notes

Select this part when a compact 3x3 mm package is required for I2C expansion. Note that while pin-compatible with PCF8574 series, software modifications are necessary due to enhanced features like individual I/O configuration and interrupt capabilities. Verify that the fixed I2C address aligns with system bus allocation needs.

I/o Expanders Part Context

This component belongs to the PCA9554 family, which enhances previous NXP I/O expanders with higher drive capability and lower supply current. The ABS3 designation specifically identifies the HVQFN16 package version with a 3x3 mm body size. It shares functional similarities with other variants but differs in physical packaging and potentially addressing schemes compared to the PCA9554A series.

I/o Expanders Replacement Considerations

PCA9554BS3,118 serves as a direct replacement within the same package type. Other family members like PCA9554PW or PCA9554AD offer alternative packages such as TSSOP16 or SO16 respectively. Ensure software compatibility when substituting with PCF8574 series devices due to architectural differences.