TCA9539PWR

Overview

The TCA9539PWR is a low-voltage 16-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus communication. 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 16 general-purpose digital input/output pins arranged in two ports, with push-pull output capability providing 10 mA sink and 25 mA drive current. It includes an interrupt output pin, a reset pin, and configuration registers for flexible operation. The component is housed in a TSSOP-24 package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports I2C and SMBus serial interfaces for system connectivity
• Includes dedicated interrupt output and reset pins for control flexibility
• Features configuration registers allowing individual pin direction setting

Applications

• Portable devices requiring extended I/O capabilities
• Industrial control systems utilizing I2C or SMBus protocols
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify the specific ordering suffix to confirm the TSSOP-24 package type, as other suffixes may indicate different form factors like VQFN. Ensure the procurement channel provides original manufacturer documentation to validate RoHS compliance and active status. Cross-reference the part number against official Texas Instruments databases to avoid counterfeit components and confirm current production lifecycle status before finalizing orders.

Selection Notes

Select this component when a design requires expanding GPIO lines via standard I2C or SMBus buses without complex driver logic. It is suitable for applications needing wide voltage compatibility from 1.65 V to 5.5 V. Engineers should consider the 400 kHz maximum clock speed and the availability of interrupt handling if real-time response to input changes is required. Verify that the TSSOP-24 footprint aligns with the PCB layout constraints.

Part Context

This device belongs to the TCA9539 series of remote 16-bit I/O expanders. It serves as a peripheral interface solution for microcontrollers and processors lacking sufficient general-purpose input/output pins. The series is characterized by low power consumption and compatibility with various digital logic families due to its wide operating voltage range.

Replacement Considerations

The TCA9539RTWR is a verified alternative offering identical functionality in a WQFN-24 package. Designers must account for the physical footprint differences between TSSOP-24 and WQFN-24 during board redesign. Other family members may share electrical specifications but differ in package style or pinout arrangement.