PCA9539RPW,118

I/o Expanders Overview

The PCA9539RPW,118 is a 24-pin CMOS device providing 16 bits of general-purpose parallel input/output expansion with interrupt and reset 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 open-drain active LOW interrupt output and an active LOW reset input. All 16 I/O pins default to inputs at power-on reset. It includes polarity inversion registers and noise filters on SCL/SDA inputs. ESD protection exceeds 2000 V HBM per JESD22-A114.

I/o Expanders Feature Summary

• Provides 16-bit I2C-bus GPIO expansion with dedicated interrupt and reset capabilities
• Features an active LOW open-drain interrupt output that activates when input states change
• Includes polarity inversion registers to adjust input data logic levels
• Offers hardware address selection via A0 and A1 pins to support multiple devices on one bus

I/o Expanders Applications

• ACPI power switches
• Sensor interface connections
• Push button monitoring
• LED control circuits
• Fan speed regulation systems

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 temperature grade matches the standard operating range of -40 °C to +85 °C. Ensure the part number aligns with NXP Semiconductors manufacturing standards for the PCA9539R series.

I/o Expanders Selection Notes

Select this variant over the standard PCA9539 when internal I/O pull-up resistors are unnecessary to reduce power consumption. Choose the RPW suffix for surface mount assembly using the TSSOP24 package. Consider the R designation if retaining I/O pin states during I2C bus recovery resets is required.

I/o Expanders Part Context

This component belongs to the PCA9539 family of I/O expanders developed by NXP Semiconductors. It serves as a low-power alternative to the PCA9555 by removing internal pull-ups. The RPW suffix specifically identifies the plastic thin shrink small outline package variant manufactured by NXP.

I/o Expanders Replacement Considerations

PCAL9539A offers pin-to-pin replacement with additional flexible I/O features and lower voltage operation down to 1.65 V. TCA9539 provides improved power-on reset circuitry to prevent latch-up issues under varying ramp rates.