PCA9554ADW

I/o Expanders Overview

The PCA9554ADW is an 8-bit I/O expander designed for the I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features three hardware address pins (A0, A1, A2) allowing up to eight devices on a single bus. It includes configuration registers, polarity inversion capabilities, and an open-drain active-low interrupt output. The component is housed in a 16-pin SOIC package with an operating temperature range from -40°C to +85°C.

I/o Expanders Feature Summary

• Provides remote I/O expansion via standard two-line bidirectional I2C interface
• Features an open-drain active-low interrupt output triggered by input state changes
• Includes internal power-on reset to initialize registers and state machine upon power application

I/o Expanders Applications

• Microcontroller general-purpose I/O expansion
• Remote peripheral control systems
• LED driving applications requiring high-current drive capability

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the 16-SOIC package variant when sourcing. Confirm that the component meets the required RoHS compliance standards for your manufacturing process. Ensure the supplier provides valid traceability documentation for the Texas Instruments origin. Check for any specific handling requirements related to moisture sensitivity levels before assembly.

I/o Expanders Selection Notes

Select this component when an 8-bit parallel port expansion is needed over an I2C bus. It is suitable for designs requiring 5-V tolerant I/Os and direct LED driving capabilities. Consider the interrupt functionality if real-time input monitoring without constant polling is required. Verify that the available PCB space accommodates the 16-pin SOIC footprint.

I/o Expanders Part Context

This part belongs to the PCA9554A family of I/O expanders. It shares pinout compatibility with the PCF8574A but requires software adjustments due to enhanced register features. The 'DW' suffix specifically denotes the 16-pin Small Outline Integrated Circuit (SOIC) package format used for surface-mount assembly.

I/o Expanders Replacement Considerations

The TCA9554DWR is a confirmed substitute part number for the PCA9554DW. Verify functional equivalence regarding the I2C address and register map before implementation.