The PCF8574AT/3,518 is a robust I/O expander from NXP Semiconductors that offers a seamless solution for extending the input/output capabilities of microcontroller-based systems. This device operates as an interface between the parallel bus of a microcontroller and serial I2C-bus, allowing for an efficient expansion of I/O points using just two wires for communication.

Key Features

• Interface Type: The device uses an I2C-bus interface, which minimizes pin usage and simplifies PCB layout and design.
• Number of I/O: It provides 8-bit remote I/O expansion for most microcontroller families, allowing for additional input and output ports.
• Operating Voltage: The operating voltage range is 2.5V to 6V, making it suitable for a wide variety of applications and compatible with logic levels of many microcontrollers.
• Interrupt Output: An interrupt output is available, which can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state.
• Addressing: Up to 8 devices can be connected to the I2C-bus without address conflicts, thanks to three hardware address inputs that allow for a total of 64 unique addresses.
• Package: The device comes in an SO16 package, which is a small outline package that is ideal for space-constrained applications.

Applications

The versatility of the PCF8574AT/3,518 makes it suitable for a broad range of applications, including but not limited to:

• Server motherboards
• Embedded systems
• Industrial control
• Robotics
• Home automation systems

Why Choose PCF8574AT/3,518?

The PCF8574AT/3,518 is an excellent choice for designers looking to increase the I/O capabilities of their systems without significantly increasing the complexity or cost. The ease of interfacing through the I2C-bus, coupled with the interrupt feature, makes it a practical component for managing multiple input and output lines efficiently. Its wide operating voltage range and the ability to address multiple devices add to its flexibility, making it a valuable addition to any microcontroller-based project.