PCA9539RPW,112

I/o Expanders Overview

The PCA9539RPW,112 is a 24-pin CMOS device providing 16-bit General Purpose parallel Input/Output expansion with interrupt and reset for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V. The device features 5 V tolerant I/Os, polarity inversion registers, active LOW interrupt output, and active LOW reset input. It supports low standby current consumption and includes noise filters on SCL/SDA inputs. The component ensures no glitch on power-up and utilizes internal power-on reset. All 16 I/O pins default to inputs upon reset. It supports a clock frequency from 0 Hz to 400 kHz and offers ESD protection exceeding 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101.

I/o Expanders Feature Summary

• Provides 16-bit I2C-bus GPIO expansion with interrupt and reset capabilities
• Features active LOW interrupt output and active LOW reset input
• Includes polarity inversion register for flexible logic configuration
• Offers 5 V tolerant I/Os suitable for mixed-voltage systems

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push buttons management
• LED control circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' against official documentation to confirm packaging details, as standard variants often utilize different packing methods such as reels or tubes. Ensure compatibility with the required temperature range and package type (TSSOP24) for your specific design constraints before finalizing procurement.

I/o Expanders Selection Notes

Select this component when additional I/O is needed while maintaining minimal interconnections. It is suitable for designs requiring low power consumption and 5 V tolerance. Consider the PCA9539R variant if hardware reset behavior must preserve I/O states during bus recovery. Verify address pin configurations to ensure unique addressing on the I2C bus.

I/o Expanders Part Context

The PCA9539 series enhances NXP Semiconductors' family of I2C-bus I/O expanders. It is identical to the PCA9555 except for the removal of internal I/O pull-up resistors, replacement of A2 with RESET, and a different address range. This modification greatly reduces power consumption when I/Os are held LOW. The device is offered in SO24, TSSOP24, and HVQFN24 packages.

I/o Expanders Replacement Considerations

PCA9539PW/Q900 serves as a qualified automotive alternative within the same package.