PCA9554ADB,112

I/o Expanders Overview

The PCA9554ADB,112 is an 8-bit I/O expander from the PCA9554A series, manufactured by NXP Semiconductors. It provides General Purpose parallel Input/Output expansion for I2C-bus and SMBus applications. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features 5 V tolerant I/Os, an active LOW interrupt output, and low standby current. The component is housed in a 16-lead SSOP plastic shrink small outline package (SOT338-1) and is rated for an ambient operating temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion compatible with I2C-bus and SMBus protocols.
• Features an open-drain interrupt output that activates when any configured input state differs from its corresponding register state.
• Includes hardware address selection pins (A0, A1, A2) to allow multiple devices on the same bus without software address conflicts.

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix scanning
• LED control arrays

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',112' corresponds to the tube packing method and standard marking requirements. Confirm the fixed I2C slave address prefix '0111' aligns with your system's bus topology to prevent address collisions with other PCA9554A devices. Ensure the SSOP16 package dimensions match your PCB footprint design constraints.

I/o Expanders Selection Notes

Select this part over the standard PCA9554 if you require a distinct fixed I2C address prefix ('0111') to maximize device density on a single bus. Verify that the SSOP16 package size fits your board space limitations compared to SOIC or HVQFN options. Ensure the 5 V I/O tolerance meets the voltage levels of your target peripherals.

I/o Expanders Part Context

This component belongs to the PCA9554 family of CMOS I/O expanders designed to enhance previous generations like the PCF8574. While pin-compatible, it requires software updates due to added features such as polarity inversion registers and higher drive capability. The 'A' variant specifically offers a different fixed address base to allow sixteen devices on one bus.

I/o Expanders Replacement Considerations

PCA9554AD,112: Identical function but uses the standard PCA9554 fixed address prefix ('0100'). Use only if bus address planning allows mixing families.