TCA9539RTWR

Overview

The TCA9539RTWR is a low-voltage 16-bit I/O expander designed for I2C and SMBus communication. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting standard, fast, and high-speed modes up to 400 kHz. The device features two 8-bit configuration registers that allow individual pin direction selection. It includes an interrupt output pin that triggers when an input state differs from its corresponding latched value. A dedicated reset pin ensures the device initializes to a known state. The component is housed in a WQFN-24 package.

Feature Summary

• Supports I2C and SMBus interfaces with configurable clock speeds
• Provides 16 general-purpose digital I/O pins with independent direction control
• Includes an interrupt output mechanism for efficient event monitoring
• Features a hardware reset pin for reliable system initialization

Applications

• Portable devices requiring extended I/O capabilities
• Industrial control systems utilizing I2C/SMBus networks
• Consumer electronics with limited microcontroller pins
• Automotive infotainment systems (via TCAL9539 variant)

Procurement Notes

Verify the specific suffix RTWR corresponds to the WQFN-24 package and tape-and-reel shipping format as defined by Texas Instruments documentation. Confirm RoHS compliance status through official datasheets or manufacturer certificates prior to procurement. Ensure the ordering part number matches the exact electrical characteristics and package dimensions required for the design.

Selection Notes

Select this component when a 16-bit expansion is needed on an I2C bus with low power consumption requirements. Compare against the TCA9538 for 8-bit needs or the TCA9555 for different interrupt configurations. Consider the operating voltage range compatibility with the host system logic levels. Evaluate the WQFN-24 package suitability for the available PCB space and thermal constraints.

Part Context

The TCA9539 belongs to the TCA953x family of low-voltage I/O expanders from Texas Instruments. This series provides flexible I/O expansion solutions for embedded applications. The RTWR suffix specifically denotes the WQFN-24 package variant. Related parts include the TCA9539RGER (VQFN-24) and TCA9539PWR (TSSOP-24), offering alternative packaging options for the same core functionality.

Replacement Considerations

Direct pin-compatible alternatives include TCA9539RGER and TCA9539PWR, which share identical electrical specifications but differ in package type. For automotive applications, consider the TCAL9539RTWRQ1, which offers AEC-Q100 qualification and extended temperature ranges. Verify package dimensions and thermal performance when substituting.