PCA9539PW,118

I/o Expanders Overview

The PCA9539PW,118 is a 24-pin CMOS device providing 16-bit general-purpose parallel input/output expansion with interrupt and reset capabilities for I2C-bus/SMBus applications. It operates within a power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The component features an active LOW open-drain interrupt output and an active LOW reset input. It includes polarity inversion registers and internal noise filters on SCL/SDA inputs. ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion with configurable input or output directions via configuration registers.
• Features an active LOW interrupt output that activates when any input state differs from its corresponding register state.
• Includes an active LOW reset input to initialize the device state machine without de-powering the system.
• Supports polarity inversion for input port data and contains internal noise filters on serial communication lines.

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push-button detection
• LED control circuits
• Fan speed regulation

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the TSSOP24 package in a 13-inch reel packing method. Confirm the manufacturer is NXP Semiconductors. Ensure the part number matches the exact datasheet revision required for your design specifications before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when additional GPIO expansion is needed for I2C-based systems requiring interrupt notifications. Consider the PCA9539R variant if the hardware reset pin must only reset the I2C interface while preserving I/O states. Verify that the operating temperature range of -40 °C to +85 °C meets the environmental requirements of the target application.

I/o Expanders Part Context

This component belongs to the PCA9539 family of low-power I/O expanders developed by NXP Semiconductors. It serves as an enhancement to the existing I2C bus I/O expander lineup, offering similar functionality to the PCA9555 but with the removal of internal pull-up resistors to reduce power consumption. The PW suffix indicates the TSSOP24 plastic thin shrink small outline package.

I/o Expanders Replacement Considerations

The PCA9539RPW,118 is a related variant within the same family. Note that the PCA9539R series has different RESET pin behavior compared to the standard PCA9539 series; verify functional compatibility regarding register retention during reset operations before substituting.