PCA9539PWRG4

I/o Expanders Overview

The PCA9539PWRG4 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 clock frequencies up to 400 kHz. The device features configuration registers, an interrupt pin, and a reset pin for system control. It is housed in a TSSOP-24 package suitable for surface mount installation. The component functions across a temperature range from -40°C to +85°C. It provides low-power operation with a typical operating current of 100 µA and output drive capabilities of 25 mA.

I/o Expanders Feature Summary

• Supports I2C and SMBus serial communication protocols for efficient bus connectivity.
• Includes dedicated interrupt output pin to notify the host of input state changes without polling.
• Features hardware reset functionality to initialize internal state machines and default register states.

I/o Expanders Applications

• Portable battery-powered systems requiring low power consumption
• Industrial control panels utilizing I2C/SMBus networks
• Consumer electronics with limited GPIO availability on microcontrollers

I/o Expanders Procurement Notes

Verify the complete part number including the G4 suffix to ensure compliance with RoHS directives and lead-free manufacturing standards. Confirm the TSSOP-24 package type matches your PCB footprint requirements. Check the specific revision level against your design documentation to ensure compatibility with existing firmware drivers and electrical specifications.

I/o Expanders Selection Notes

Select this component when a 16-bit expansion is required for I2C or SMBus buses within the 2.3 V to 5.5 V voltage window. The TSSOP-24 package is appropriate for standard surface-mount assembly processes. Consider the interrupt capability if real-time input monitoring is necessary to reduce processor load compared to continuous polling methods.

I/o Expanders Part Context

This device belongs to the PCA9539 series of low-power I/O expanders. It shares functional similarities with other members like the PCA9539DB but differs in packaging and specific ordering suffixes. The G4 suffix typically indicates environmental compliance and manufacturing origin details defined by Texas Instruments for this specific product line iteration.

I/o Expanders Replacement Considerations

The TCA9539 series offers improved power-on reset circuitry and wider voltage support down to 1.65 V. Verify pinout compatibility before substitution, as package differences may exist between TSSOP and VQFN variants within the same logical family.