TCA9554ADWT

Overview

The TCA9554ADWT is an 8-bit I/O expander from Texas Instruments, designed for remote I/O expansion via I2C and SMBus interfaces. It operates within a supply voltage range of 1.65 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features open-drain outputs and includes an interrupt output pin for efficient event handling. It is housed in a 16-SOIC package with a width of 7.50 mm and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Supports bidirectional data transfer through I2C and SMBus serial interfaces
• Includes configuration registers to define individual port directions
• Features an interrupt output pin that signals state changes on inputs

Applications

• Portable systems requiring extended GPIO capabilities
• Industrial control panels needing remote input monitoring
• Consumer electronics utilizing low-voltage logic interfaces

Procurement Notes

Verify the specific suffix 'DWT' corresponds to the tape-and-reel packaging format intended for automated assembly processes. Confirm that the operating voltage requirements align with the system's power rails, as the device supports a wide range from 1.65 V to 5.5 V. Ensure compatibility with the host controller's I2C/SMBus protocol levels before integration.

Selection Notes

Select this component when an 8-bit expansion is required in a surface-mount SOIC-16 footprint. Consider the TCA9554ADBQRG4 or TCA9554APWR if alternative packages like DSBGA or TSSOP are preferred for space-constrained designs. Verify that the 400 kHz maximum clock speed meets the communication timing requirements of the application.

Part Context

This part belongs to the TCA9554A series of low-power I/O expanders. It shares core functionality with variants such as TCA9554ADBR (SSOP-16) and TCA9554APWR (TSSOP-16). The primary distinction lies in the physical package type and reel specifications, while maintaining identical electrical characteristics and pinout configurations for interchangeable design use.

Replacement Considerations

Direct substitutes include TCA9554ADBR for SSOP-16 packaging and TCA9554APWR for TSSOP-16 packaging. These alternatives maintain functional equivalence but require layout adjustments due to differing physical dimensions.