PCA9555PWE4

I/o Expanders Overview

The PCA9555PWE4 is a 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments, housed in a 24-TSSOP package. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features an interrupt output capability and includes configuration registers for input/output selection. It provides general-purpose parallel input/output expansion with individual I/O configuration options. The component is designed for applications requiring additional I/O ports in systems utilizing I2C or SMBus interfaces.

I/o Expanders Feature Summary

• Provides 16 bits of general-purpose parallel input/output expansion for I2C/SMBus applications
• Features an open-drain interrupt output activated when input states differ from corresponding port register states
• Includes configuration registers allowing individual I/O direction selection and polarity inversion

I/o Expanders Applications

• ACPI power switch control
• Sensor interface expansion
• Pushbutton and LED matrix scanning

I/o Expanders Procurement Notes

Verify the specific suffix 'E4' against current manufacturer documentation to confirm active status, as some sources indicate this variant may be discontinued. Ensure compatibility with existing PCB footprints and software drivers before procurement. Cross-reference with equivalent active parts if supply chain continuity is required.

I/o Expanders Selection Notes

Select this component when a 16-bit I/O expander with interrupt functionality is needed in a 24-TSSOP package. Confirm that the system voltage falls within the 2.3 V to 5.5 V range. Verify that the I2C address configuration meets system requirements. Consider the discontinuation status indicated by some distributors when planning long-term production.

I/o Expanders Part Context

The PCA9555 series is part of Texas Instruments' portfolio of remote I/O expanders. This specific model extends the capabilities of earlier Philips/NXP designs with improved drive capability and lower supply current. It maintains pin-to-pin and I2C address compatibility with similar devices like the PCF8575, though software adjustments may be necessary due to architectural enhancements.

I/o Expanders Replacement Considerations

Check for direct replacements such as the PCA9555PWR or TCA9555RGER depending on voltage and package requirements. Verify software compatibility if substituting with variants from different manufacturers or families.