TCA9555DBT

Overview

The TCA9555DBT is a 16-bit I/O expander manufactured by 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 push-pull outputs capable of sourcing 10 mA and sinking 25 mA per pin. It includes an interrupt output pin and configuration registers for input/output direction control. The component is housed in a 24-SSOP package with a width of 5.30 mm and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Supports bidirectional data transfer through standard I2C and SMBus protocols
• Provides remote I/O expansion with dedicated interrupt output capability
• Configurable input/output directions via internal configuration registers

Applications

• Remote I/O expansion in embedded systems
• Interface extension for microcontrollers using I2C/SMBus
• Consumer electronics requiring additional digital I/O pins

Procurement Notes

Verify the complete part number including the suffix 'DBT' to ensure correct packaging and tape-and-reel configuration. Confirm RoHS compliance status as specified in the manufacturer's documentation. Check for any specific ordering information regarding moisture sensitivity levels before procurement. Ensure compatibility with existing PCB footprint requirements for the 24-SSOP package.

Selection Notes

Select this component when 16-bit I/O expansion is required with low-voltage operation down to 1.65 V. Consider the 400 kHz maximum clock speed for communication timing requirements. Evaluate the push-pull output drive strength against load requirements. Verify that the 24-SSOP package dimensions fit the available board space constraints.

Part Context

This device belongs to the TCA9555 series of I/O expanders from Texas Instruments. It shares functional similarities with other members of the family but differs in specific electrical characteristics and package options. The TCA9555 variant is optimized for wide voltage operation and industrial temperature ranges compared to some commercial-grade alternatives.

Replacement Considerations

The PCA9555 series offers similar functionality but typically starts at a higher minimum supply voltage of 2.3 V. Verify voltage compatibility if substituting with PCA9555 variants. Other compatible parts may include different package types or slight variations in current drive capabilities.