Texas Instruments

PCA9557RGYR  

I/O Expanders

PCA9557RGYR Description

The PCA9557RGYR is an I/O expander integrated circuit (IC) designed by Texas Instruments. It features an 8-bit I/O expander with a 400 kHz I2C and SMBus interface, making it suitable for a variety of applications where additional I/O ports are required. This device operates within a supply voltage range of 2.3V to 5.5V and supports a maximum output source current of 10mA and a maximum output sink current of 25mA. The PCA9557RGYR is packaged in a 16-lead VQFN (Tape & Reel) format, ideal for surface-mount applications. It is RoHS3 compliant and REACH unaffected, ensuring environmental and regulatory compliance. The device also includes a Power-On Reset (POR) feature, which initializes the device to a known state upon power-up. Despite being marked as obsolete, the PCA9557RGYR remains a robust solution for expanding I/O capabilities in various electronic systems.

PCA9557RGYR Features

• I2C and SMBus Interface: The PCA9557RGYR supports both I2C and SMBus protocols, providing flexibility in communication interfaces.
• 8-bit I/O Expansion: Offers 8 programmable I/O ports, allowing for significant expansion of control and monitoring capabilities.
• Power-On Reset (POR): Ensures reliable operation by resetting the device to a known state upon power-up.
• Wide Operating Voltage Range: Operates within a 2.3V to 5.5V supply voltage range, making it suitable for a variety of power supply conditions.
• Current Handling: Capable of sourcing up to 10mA and sinking up to 25mA per I/O pin, providing robust current handling capabilities.
• Surface-Mount Packaging: The 16-lead VQFN package is ideal for compact and high-density PCB designs.
• Environmental Compliance: RoHS3 compliant and REACH unaffected, ensuring compliance with environmental regulations.
• Moisture Sensitivity Level (MSL): Rated at MSL 2 (1 Year), ensuring reliability in various environmental conditions.

PCA9575RGYR Applications

The PCA9557RGYR is ideal for applications requiring additional I/O ports with minimal additional components. Some specific use cases include:

• Embedded Systems: Expanding I/O capabilities in microcontroller-based systems.
• Industrial Control: Monitoring and controlling various industrial processes.
• Consumer Electronics: Enhancing the functionality of consumer devices by adding more I/O ports.
• Automotive: Managing various sensors and actuators in automotive applications.
  -Communication Systems: Expanding I/O for communication interfaces and peripherals.

Conclusion of PCA9557RGYR

The PCA9557RGYR from Texas Instruments is a versatile I/O expander IC that offers significant expansion capabilities with its 8-bit I/O ports and support for both I2C and SMBus protocols. Its wide operating voltage range, robust current handling, and surface-mount packaging make it suitable for a variety of applications. Despite being marked as obsolete, the PCA955RG7YR remains a reliable choice for expanding I/O capabilities in electronic systems. Its environmental compliance and moisture sensitivity level ensure durability and reliability in various conditions. For applications requiring additional I/O ports with minimal additional components, the PCA9557RGYR is an excellent solution.

PCA9557RGYR Documents

Download datasheets and manufacturer documentation for PCA9557RGYR

Datasheets :

PCA9557 Datasheet      

PCN Obsolescence/ EOL :

EOL- 08/May/2023      

HTML Datasheet :

PCA9557 Datasheet      

PCN Design/Specification :

Datasheet Update 25/Jun/2014