PCA9553TK/02,118

Overview

The PCA9553TK/02,118 is a linear LED driver IC manufactured by NXP USA Inc., designed for I2C-bus and SMBus applications. It features four open-drain outputs capable of sinking up to 25 mA per channel, with a total package current limit of 100 mA. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It includes an internal oscillator providing two programmable blink rates, eliminating the need for external components or continuous bus commands for blinking functions. The component is housed in an 8-TSSOP surface-mount package.

Feature Summary

• Integrates an internal oscillator to generate two fully programmable blink rates without external components
• Provides four independent open-drain outputs directly driving LEDs at up to 25 mA per bit
• Allows unused bits to function as general-purpose parallel input/output expansion
• Features internal power-on reset logic initializing registers to default high states

Applications

• I2C-bus and SMBus applications requiring limited bus traffic
• Systems needing to free up microcontroller timers for other tasks
• General-purpose parallel input/output expansion scenarios
• LED indicator control where hardware address differentiation is required on shared buses

Procurement Notes

Verify the specific suffix TK against official NXP documentation to confirm pinout and electrical characteristics match your design requirements. Confirm availability status as distribution data indicates potential stock limitations. Ensure the fixed I2C address associated with the /02 variant aligns with your system's addressing scheme to prevent conflicts.

Selection Notes

Select this component when designing systems that require LED blinking functionality without burdening the main processor's timer resources. It is suitable for applications needing both LED control and additional GPIO lines within a compact 8-pin footprint. Consider the fixed I2C address constraints compared to variants with hardware address pins when planning multi-device bus architectures.

Part Context

This part belongs to the PCA9553 family of LED blinkers, distinct from standard I/O expanders like the PCF8574. Unlike devices requiring repeated commands for blinking, this IC handles timing internally after initial setup. The /02 designation indicates a specific fixed I2C bus address configuration, allowing it to coexist with /01 variants on the same bus despite lacking dedicated hardware address pins.

Replacement Considerations

PCA9553DP/01,118 is documented as a parameter-equivalent substitute available through Rochester Electronics, LLC.