PCA9539AHF,128

I/o Expanders Overview

The PCA9539AHF,128 is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander designed for I2C-bus and SMBus applications. It features an operating power supply voltage range of 1.65 V to 5.5 V and supports Fast-mode communication at 400 kHz. The device includes an active LOW reset input and an open-drain active LOW interrupt output. It offers latched outputs with a maximum drive capability of 25 mA for direct LED driving. Standby current consumption is typically 1.5 μA at 5 V VDD and 1.0 μA at 3.3 V VDD. The component is housed in a HWQFN24 package.

I/o Expanders Feature Summary

• Pin and function compatible with the standard PCA9539
• Schmitt-trigger action on SCL and SDA inputs for improved noise immunity
• Internal power-on reset initializes registers and state machine to default states
• ESD protection exceeds JESD22 standards with 2000 V Human Body Model rating

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button arrays
• LED control circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix matches the required packaging format. Confirm that the HWQFN24 package variant aligns with PCB footprint constraints. Ensure the temperature range specification meets operational requirements. Validate pin compatibility if replacing legacy components. Check for any recent revisions to the datasheet regarding electrical characteristics.

I/o Expanders Selection Notes

Select this component when expanding GPIO capacity via I2C while maintaining compatibility with existing PCA9539 designs. Consider the wide voltage range for interfacing with varying microcontroller supply levels. Evaluate the interrupt functionality for event-driven system architectures. Assess the latch-up performance requirements against industry standards.

I/o Expanders Part Context

This part belongs to the PCA9539A series of I/O expanders manufactured by NXP Semiconductors. It serves as a drop-in replacement for the original PCA9539, offering identical pinouts and functions. The series addresses the need for additional I/O ports in space-constrained embedded systems without increasing interconnection complexity.

I/o Expanders Replacement Considerations

The PCAL9539A is a fully featured alternative within the same family, offering Agile I/O capabilities. Verify functional equivalence if substituting with other industry-standard parts. Ensure interface protocols remain compatible during cross-manufacturer replacements.