PCA9554APWR

I/o Expanders Overview

The PCA9554APWR is an 8-bit I/O expander for the I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features three hardware address pins (A0, A1, A2) allowing up to eight devices on a single bus. It includes configuration registers, polarity inversion capabilities, and an open-drain active-low interrupt output. The unit is housed in a 16-pin TSSOP package and functions across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides remote I/O expansion via standard I2C and SMBus protocols
• Features an open-drain interrupt output triggered by input state changes
• Includes internal power-on reset to initialize registers and state machines

I/o Expanders Applications

• Microcontroller system port expansion
• Remote peripheral control in embedded systems
• LED driving applications requiring high-current drive capability

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package variant required for your design. Confirm that the component meets RoHS compliance standards if applicable to your manufacturing process. Ensure the supplier provides valid traceability documentation for production integration.

I/o Expanders Selection Notes

Select this component when an 8-bit parallel interface is needed over a serial bus with interrupt signaling. It is compatible with the PCF8574A pinout but requires software adjustments due to enhanced register functionality. Consider the 2.3 V minimum operating voltage for low-power designs.

I/o Expanders Part Context

This part belongs to the PCA9554A family of I/O expanders from Texas Instruments. It shares architectural similarities with other members of the series but is distinguished by its specific fixed I2C address and package configuration. It serves as a bridge between microcontrollers and external peripherals.

I/o Expanders Replacement Considerations

The PCA9554 is functionally identical except for its fixed I2C address, allowing mixed usage on the same bus. Verify software compatibility if substituting with other I/O expanders, as register maps may differ significantly.