TCA9535DBT

Overview

The TCA9535DBT 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 an interrupt output pin and configuration registers that allow individual pins to be set as inputs or outputs. It provides open-drain outputs with drive capabilities of 10 mA and 25 mA. The component includes 2 kV ESD protection and functions reliably across an operating temperature range from -40°C to +85°C. It is housed in an SSOP-24 package.

Feature Summary

• Supports bidirectional data transfer via I2C and SMBus protocols
• Configurable input/output pins through dedicated configuration registers
• Dedicated interrupt output pin for efficient event monitoring

Applications

• Portable systems requiring extended I/O capabilities
• Industrial control applications with limited microcontroller pins
• Consumer electronics utilizing I2C bus architectures

Procurement Notes

Verify the specific suffix 'DBT' corresponds to the SSOP-24 package and tape-and-reel shipping format when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application environment.

Selection Notes

Select this component when a 16-bit expansion is required on an I2C bus with low power consumption constraints. The wide supply voltage range allows compatibility with various logic levels. Consider the SSOP-24 package dimensions for PCB layout constraints. Verify that the 400 kHz maximum clock speed meets the system's timing requirements.

Part Context

This part belongs to the TCA9535 family of low-power I/O expanders. It serves as a functional equivalent to the legacy PCA9535 series but may offer updated manufacturing processes or packaging options. The device addresses the need for additional GPIOs in space-constrained designs without increasing the pin count of the primary controller.

Replacement Considerations

The PCA9535 is a documented predecessor in the same functional category. Verify pinout compatibility and register mapping before substitution. Other variants like TCA9535RTWR offer different packages such as WQFN-24 for alternative form factors.