TCA6408PW

Overview

The TCA6408PW is an 8-bit I/O expander designed for low-voltage applications, operating within a supply voltage range of 1.65 V to 5.5 V. It interfaces with the microcontroller via the I2C bus and SMBus protocols, supporting clock frequencies up to 400 kHz. The device features open-drain outputs capable of sourcing or sinking up to 25 mA per pin. It includes an interrupt output pin to signal state changes to the host processor. The component is housed in a 16-pin TSSOP package and is rated for operation across a temperature range of -40°C to +85°C.

Feature Summary

• Provides eight general-purpose digital input/output pins accessible through standard I2C/SMBus communication.
• Features an interrupt output mechanism that alerts the system controller to specific I/O port states without continuous polling.
• Supports flexible voltage translation allowing compatibility between different logic levels within the specified operating range.

Applications

• Portable consumer electronics requiring additional GPIOs in space-constrained designs
• Industrial control systems utilizing I2C-based monitoring and actuation
• Embedded systems needing voltage level shifting between core logic and peripheral devices

Procurement Notes

Verify the exact suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Confirm RoHS compliance status as manufacturing sites may vary. Check for obsolescence notices or lifecycle changes directly from Texas Instruments before finalizing procurement plans.

Selection Notes

Select this component when an 8-bit expansion is required for I2C-compatible controllers. Ensure the design accommodates the 16-pin TSSOP footprint. Verify that the system voltage remains within the 1.65 V to 5.5 V window. Consider the open-drain output configuration for proper pull-up resistor implementation in the circuit design.

Part Context

This part belongs to the TCA6408 family of I/O expanders from Texas Instruments. It shares functional similarities with other members like the TCA6408A but may differ in specific electrical characteristics or packaging options. The PW suffix specifically denotes the TSSOP-16 package variant.

Replacement Considerations

Direct substitutes include the TCA6408APW and TCA6408APWRG4. Verify pinout compatibility and electrical specifications against the original datasheet before substitution.