TCA6408ARGTR

Overview

The TCA6408ARGTR is a low-voltage 8-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 3.6 V and supports clock frequencies up to 400 kHz. The device features an interrupt output, reset functionality, and configuration registers for flexible pin direction control. Packaged in a 16-pin WSON format, it is designed for space-constrained applications requiring extended general-purpose input/output capabilities via standard serial interfaces.

Feature Summary

• Provides eight bidirectional general-purpose digital input and output pins accessible through I2C or SMBus protocols.
• Includes dedicated interrupt output logic to signal state changes on configured input pins without continuous polling.
• Integrates internal configuration registers allowing individual pin direction selection between input and output modes.

Applications

• Portable consumer electronics requiring additional GPIOs within limited board space
• Embedded systems utilizing I2C/SMBus communication for peripheral expansion
• Battery-powered devices benefiting from low-voltage operation and power efficiency

Procurement Notes

Verify the specific suffix 'ARGTR' against the manufacturer's current datasheet to confirm package type and tape-and-reel specifications. Ensure compatibility with system voltage levels, as this variant operates at 1.65 V to 3.6 V, distinct from higher voltage versions. Confirm RoHS compliance status and lead-free manufacturing details prior to integration into production assemblies.

Selection Notes

Select this component when design constraints require an 8-bit expander in a compact WSON package rather than larger TSSOP options. Verify that the host controller supports I2C or SMBus protocols compatible with the 400 kHz maximum clock speed. Consider the 1.65 V to 3.6 V operating range to ensure alignment with the target system's power supply architecture and logic level requirements.

Part Context

This part belongs to the TCA6408A family of low-voltage I/O expanders. It shares functional similarities with other members like TCA6408APWR but differs in packaging and specific electrical characteristics defined by the ARGTR suffix. The series is designed for applications needing reliable serial interface expansion in modern low-power electronic designs.

Replacement Considerations

Direct substitutes include TCA6408ARGTRG4, which denotes identical functionality with specific manufacturing or compliance variations. Other family members such as TCA6408APWR offer similar electrical performance but utilize a different TSSOP-16 package, requiring PCB layout adjustments if used as a drop-in replacement.