The PCF8574AT/3,512 is a versatile integrated circuit designed and manufactured by NXP Semiconductors. This silicon chip serves as a remote 8-bit I/O expander for the I2C-bus, enabling a host controller to communicate with multiple I/Os through a simple two-wire interface. This feature is particularly beneficial for applications where pin count is limited on the main controller, and additional I/O ports are needed.

Key Features

• I2C Interface: The device operates as an interface to the I2C-bus, allowing for serial, 8-bit parallel conversion and vice-versa.
• 8-bit Remote I/O Ports: Each PCF8574AT/3,512 chip provides an additional 8 I/O ports, which can be used for input or output.
• Addressing: Built-in address pins allow for up to eight devices to share the same I2C bus, offering a possibility of 64 extra I/Os.
• Interrupt Output: An interrupt output is available, which can be configured to alert the host controller of any input changes, thus reducing the need for constant polling.
• Operating Voltage: The device supports a wide range of supply voltages from 2.5V to 6V, making it suitable for various logic levels and power requirements.
• Low Standby Current: The low standby current is beneficial for power-sensitive applications.

Applications

The PCF8574AT/3,512 is ideal for expanding the I/O capabilities of microcontrollers in a wide array of applications, including:

• Industrial control systems
• Sensor networks
• Mobile applications
• Home automation systems
• Embedded systems

Package and Quality

The PCF8574AT/3,512 comes in a surface-mount SO16 package, which is compact and suitable for space-constrained applications. NXP ensures high-quality and reliability standards, making this I/O expander a trustworthy component for both prototyping and production volumes.