PCA9539PWR

I/o Expanders Overview

The PCA9539PWR is a 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features 16 general-purpose I/O pins with open-drain outputs capable of sourcing or sinking up to 25 mA. It includes configuration registers, an interrupt pin, and a reset pin for system control. Operating temperatures range from -40°C to +85°C. The component is housed in a TSSOP-24 package and provides ESD protection rated at 2 kV.

I/o Expanders Feature Summary

• Supports I2C and SMBus serial communication protocols for efficient data transfer.
• Includes dedicated interrupt output and reset pin functionality for system monitoring and recovery.
• Features configurable input/output direction registers for flexible pin assignment.

I/o Expanders Applications

• Portable devices requiring low-power I/O expansion
• Industrial control systems utilizing SMBus interfaces
• Consumer electronics needing additional GPIO capabilities

I/o Expanders Procurement Notes

Verify the specific ordering suffix and RoHS compliance status before procurement, as variations exist within the PCA9539 family. Confirm that the TSSOP-24 package matches your PCB footprint requirements. Ensure the selected variant meets the required operating temperature range for your specific application environment. Cross-reference the manufacturer datasheet for any recent product change notifications affecting this part number.

I/o Expanders Selection Notes

Select this component when a 16-bit I/O expander with I2C/SMBus compatibility is required. Ensure the system voltage falls within the 2.3 V to 5.5 V operational range. Consider the open-drain output structure for level shifting needs. Verify that the 400 kHz clock speed meets the system's communication bandwidth requirements. Check for alternative packages if space constraints differ from the TSSOP-24 form factor.

I/o Expanders Part Context

The PCA9539PWR belongs to the PCA9539 series of low-power I/O expanders from Texas Instruments. This series is designed to provide additional digital inputs and outputs via standard serial interfaces. The PWR suffix indicates the TSSOP-24 surface-mount package variant. It serves as a solution for expanding microcontroller I/O capabilities in space-constrained designs.

I/o Expanders Replacement Considerations

Direct substitutes include other variants within the PCA9539 family such as PCA9539PW or PCA9539PWG4, provided the package type (TSSOP-24) and electrical specifications are compatible. Verify pinout compatibility and software register mapping before substitution.