TCA9555RTWR

Overview

The TCA9555RTWR is a low-voltage 16-bit I/O expander manufactured by Texas Instruments, designed for remote I2C and SMBus applications. 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 and configuration registers, housed in a WQFN-24 package suitable for surface-mount installation. It provides 16 configurable I/O lines with open-drain outputs and includes ESD protection rated at 2 kV. The component functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Supports I2C and SMBus serial communication protocols for system integration
• Includes dedicated interrupt output pin for efficient event handling
• Features configuration registers allowing individual pin direction control

Applications

• Portable devices requiring extended GPIO capabilities
• Industrial control systems utilizing SMBus interfaces
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify the specific suffix RTWR corresponds to the WQFN-24 package and reel packaging format before ordering. Confirm that the 1.65 V minimum operating voltage aligns with your system's power rails. Ensure compatibility with your I2C bus voltage levels and check for moisture sensitivity requirements during storage and reflow soldering processes.

Selection Notes

Select this component when a wide supply voltage range including 1.8 V and 3.3 V systems is required. Compare against the PCA9555 series if a higher minimum voltage of 2.3 V is acceptable for your design. Consider the WQFN-24 footprint constraints and thermal dissipation needs relative to other available packages like SSOP or VQFN variants.

Part Context

This part belongs to the TCA9555 family of low-voltage I/O expanders from Texas Instruments. It shares functional similarities with the PCA9555 but offers enhanced low-voltage operation starting at 1.65 V. The RTWR suffix specifically denotes the tape-and-reel packaging variant intended for automated assembly processes.

Replacement Considerations

TCA9555RGER (VQFN-24 package)

FAQ

What is the maximum clock frequency supported by the TCA9555RTWR?

The device supports standard mode and fast mode I2C/SMBus communications with a maximum clock frequency of 400 kHz.

Does the TCA9555RTWR include an interrupt output?

Yes, the TCA9555RTWR features a dedicated interrupt output pin that can be configured to signal state changes on the I/O ports.

What is the operating temperature range for this component?

The TCA9555RTWR is rated for operation in temperatures ranging from -40°C to +85°C.