TCA9538DBR

Overview

The TCA9538DBR is an 8-bit I/O expander from Texas Instruments designed for I2C and SMBus communication. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting low-power applications across various digital systems. The device features open-drain outputs and includes configuration registers, an interrupt pin, and a reset pin for enhanced control. It supports clock frequencies up to 400 kHz and functions reliably between -40°C and +85°C. Packaged in an SSOP-16 format, it provides robust ESD protection rated at 2 kV.

Feature Summary

• Supports I2C and SMBus serial interfaces for flexible system integration
• Includes dedicated interrupt output and reset pin functionality
• Features configurable input/output ports with open-drain output structure

Applications

• Portable consumer electronics requiring low power consumption
• Industrial control systems utilizing I2C/SMBus protocols
• Embedded systems needing additional general-purpose I/O expansion

Procurement Notes

Verify the specific ordering suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compatibility with system voltage levels ranging from 1.65 V to 5.5 V. Confirm that the SSOP-16 footprint matches the design layout. Check for RoHS compliance status if required by regional regulations. Validate operating temperature ranges against environmental conditions.

Selection Notes

Select this component when an 8-bit I/O expansion solution is required with low-voltage operation capabilities down to 1.65 V. It is suitable for designs prioritizing low power consumption compared to higher voltage alternatives. Consider the SSOP-16 package constraints during PCB layout planning. Verify interface compatibility with existing I2C or SMBus controllers before implementation.

Part Context

This part belongs to the TCA9538 series, which offers improved low-voltage performance over previous generations like the PCA9538. The TCA variant specifically extends the minimum operating voltage to 1.65 V, making it ideal for modern low-power applications. It maintains functional compatibility while enhancing energy efficiency standards.

Replacement Considerations

The PCA9538DBR serves as a related alternative but requires a minimum supply voltage of 2.3 V. Designers must verify voltage level compatibility when substituting between these variants. Other family members may offer different pin counts or package styles.