The CAT9555YI-T2 is a high-performance CMOS device from ON Semiconductor that combines 16-bit I/O port expander functionality with I²C bus (Inter-Integrated Circuit) interface capability. This advanced product is designed to provide a seamless solution for expanding I/O capabilities when additional inputs/outputs are needed while keeping the number of pins on the microcontroller constant.

Key Features

• I²C Interface: The CAT9555YI-T2 operates via an I²C interface, which allows for easy serial communication with microcontrollers and other devices on the bus, enabling designers to implement complex communication protocols with minimal wiring.
• 16-Bit I/O Ports: With 16 I/O ports, this device can significantly increase the available input and output options for embedded systems, making it ideal for applications that require additional pins for interfacing with sensors, buttons, LEDs, and other peripherals.
• Configurable Polarity: The polarity of the input port can be inverted with the polarity inversion register, which provides additional flexibility in interfacing with external circuitry.
• Output Drive Capability: The device offers strong output drive capability, which is suitable for driving LEDs and other output devices directly.
• Low Standby Current: It features a low standby current, which makes it suitable for battery-powered and power-sensitive applications.

Applications

The CAT9555YI-T2 is versatile and can be employed in a wide array of applications. It is particularly useful in situations where additional I/Os are required for:

• Industrial control systems
• Server motherboards
• Home automation systems
• Consumer electronics
• Portable devices

Quality and Reliability

ON Semiconductor is known for its commitment to quality and reliability, and the CAT9555YI-T2 is no exception. It is designed to meet the stringent requirements of industrial and automotive applications, ensuring long-term reliability and performance under various operating conditions.