The PCF8574AP,112 is a robust, versatile 8-bit I/O (Input/Output) expander from the renowned semiconductor manufacturer NXP. This integrated circuit (IC) is designed to provide general-purpose remote I/O expansion for most microcontroller families via the two-line bidirectional I²C-bus (Inter-Integrated Circuit).

Key Features

• I²C to Parallel Port Expander: This IC can effectively convert the serial output from an I²C bus to eight separate parallel output lines.
• Operating Voltage: The device supports a wide range of supply voltages from 2.5V to 6V, making it suitable for various applications and compatible with logic levels of many microcontrollers.
• Low Standby Current: Its design ensures low power consumption with a typical standby current of only 10μA, which is ideal for battery-powered applications.
• Address Pins: Three hardware address pins allow up to eight devices to share the same I²C bus, providing the possibility to extend up to 64 I/Os on a single bus.
• Interrupt Output: An interrupt output is provided that can be connected to the interrupt logic of the microcontroller. This informs when any input state has changed without the need for the microcontroller to continuously poll the expander.
• High Noise Immunity: The inputs are designed with high noise immunity, which is crucial for industrial environments.
• Open-Drain Interrupt Output: The open-drain interrupt output allows the connection of several devices in a wired-AND configuration.

Applications

The PCF8574AP,112 is suitable for a myriad of applications where additional I/Os are required, especially in the context of space and power-constrained designs. It is commonly used in:

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

Technical Specifications

• Package: DIP-16 (Dual In-line Package)
• Operating Temperature: -40°C to +85°C
• Compliance: The device is compliant with the RoHS (Restriction of Hazardous Substances) directive, ensuring environmental friendliness by avoiding the use of certain hazardous materials.

In summary, the PCF8574AP,112 by NXP is a powerful solution for expanding the I/O capabilities of microcontroller-based systems, offering ease of integration, reliability, and scalability for complex electronic designs.