PCA9554APWG4

I/o Expanders Overview

The PCA9554APWG4 is an 8-bit I/O expander for the two-line bidirectional I2C bus, designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion via the I2C interface and supports up to 400-kHz Fast I2C Bus speeds. The device features three hardware address pins (A0, A1, A2) allowing up to eight devices on the same bus. It includes an open-drain active-low interrupt output, configuration registers, polarity inversion registers, and internal power-on reset. The component operates within a temperature range of -40°C to +85°C and is housed in a TSSOP-16 package.

I/o Expanders Feature Summary

• Open-drain active-low interrupt output for indicating input state changes
• Three hardware address pins enabling multiple devices on a single I2C/SMBus
• Internal power-on reset ensuring initialization to default states upon power application
• Configuration registers allowing flexible selection of input or output modes

I/o Expanders Applications

• Remote I/O expansion for microcontroller families
• Direct LED driving applications due to high-current drive capability
• Systems requiring interrupt-driven input monitoring without continuous bus polling

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 G4 suffix indicates compliance with current environmental standards. Ensure the supply voltage range of 2.3 V to 5.5 V aligns with your system's power rails before finalizing procurement.

I/o Expanders Selection Notes

Select this component when pin-to-pin compatibility with PCF8574A is needed but enhanced register functionality is required. Consider the TSSOP-16 package dimensions if board space is constrained. Verify that the 400-kHz clock frequency meets the timing requirements of your I2C master controller.

I/o Expanders Part Context

The PCA9554A series is distinct from the standard PCA9554 primarily by its fixed I2C address, allowing up to 16 devices (eight of each type) on the same bus. This specific part belongs to the Texas Instruments portfolio of interface ICs designed for expanding digital inputs and outputs over serial communication buses.

I/o Expanders Replacement Considerations

TCA9554ADWR is a recommended manufacturer replacement offering similar functionality with a wider voltage range starting at 1.65 V.