The PD9555/PCA9555 from Texas Instruments is a sophisticated, high-performance integrated circuit that is designed for a wide range of applications.

• Product Name: PD9555/PCA9555
• Manufacturer: Texas Instruments
• Type: 16-bit I²C and SMBus, low power I/O (input/output) expander
• Description: Provides a simple solution for expanding the I/O in a system
• Suitable For: Interfacing with any microcontroller or microprocessor on the I²C bus or SMBus
• Features: 16-bit of quasi-bidirectional input/output, interrupt output, hardware address control inputs, and a reset input.
• Operating Voltage Range: 2.3V to 5.5V
• Maximum Sink Current: 25 mA
• Ideal Choice For: Applications such as servers, medical equipment, and industrial automation where a large number of I/Os are required.
• Hardware Address Pins: Two hardware address pins allow up to four devices to share the same I²C bus or SMBus.
• Package: 24-pin TSSOP package