PCA9539RBS,118

I/o Expanders Overview

The PCA9539RBS,118 is a 24-pin CMOS device providing 16 bits of general-purpose parallel input/output expansion with interrupt and reset capabilities for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features an active LOW open-drain interrupt output and an active LOW reset input. It includes polarity inversion registers and noise filters on SCL/SDA inputs. ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101. Latch-up testing meets JEDEC Standard JESD78 exceeding 100 mA. The package is HVQFN-24.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion with dedicated interrupt and reset functionality for I2C-bus and SMBus systems.
• Features an active LOW reset pin that initializes the device state machine while preserving internal general-purpose register states.
• Includes polarity inversion registers allowing flexible active HIGH or active LOW operation configuration.
• Offers 5 V tolerant I/Os and low standby current consumption suitable for power-sensitive designs.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify component authenticity through authorized NXP channels. Confirm RoHS compliance status via official documentation. Ensure proper handling of the HVQFN-24 package during assembly. Validate ordering suffixes against current datasheet specifications. Check for end-of-life status before finalizing procurement plans.

I/o Expanders Selection Notes

Select this variant when I2C bus recovery without losing I/O state is required. The PCA9539R differs from standard PCA9539 by retaining register data during hardware resets. Verify voltage compatibility within the 2.3 V to 5.5 V range. Consider the HVQFN-24 package constraints for thermal management and PCB layout requirements.

I/o Expanders Part Context

This component belongs to the PCA9539 family of I/O expanders. It shares architectural similarities with the PCA9555 but lacks internal pull-up resistors to reduce power consumption. The 'R' designation indicates specific reset behavior distinct from the base model. It serves as a GPIO expander for embedded systems requiring additional digital I/O lines over serial buses.

I/o Expanders Replacement Considerations

TCA9539 offers improved power-on reset circuitry and wider voltage support down to 1.65 V. TCA9539 maintains software compatibility and provides enhanced robustness against latch-up conditions during power sequencing events.