The XR16L784IV from Exar Corporation is a quad universal asynchronous receiver/transmitter (UART) with a 64-byte FIFO, offering enhanced features and flexible options for serial communication. This device is designed for various applications requiring multiple serial ports, such as industrial automation, point-of-sale systems, and embedded networking.

Applications:

• Industrial Automation Systems
• Point-of-Sale (POS) Terminals
• Embedded Networking Devices
• Multi-Port Serial Cards
• Remote Access Servers
• Telecommunications Equipment

Features:

• Quad UART: Four independent UART channels
• Data Rates: Up to 16 Mbps
• 64-Byte FIFO: Transmit and receive FIFOs for each channel
• Automatic Hardware and Software Flow Control
• RS-232, RS-485, and RS-422 Compatibility
• IrDA (Infrared Data Association) Support
• Interrupt Generation

Benefits:

• Multiple Serial Ports: Four UART channels in a single chip reduce component count and board space.
• High Data Throughput: Data rates up to 16 Mbps enable fast and efficient serial communication.
• Reduced CPU Load: Large FIFOs minimize CPU intervention and improve system performance.
• Flexible Interface Options: Supports various serial communication standards, including RS-232, RS-485, and RS-422.
• Enhanced Reliability: Automatic flow control prevents data loss and ensures reliable communication.
• Simplified System Design: Integrated features simplify system design and reduce development time.

Additional Details:

The XR16L784IV includes advanced features such as automatic hardware and software flow control, which prevent data overrun and underrun errors. Each UART channel has a 64-byte FIFO for both transmit and receive operations. This allows for buffering of data, reducing the need for frequent CPU intervention. The device supports IrDA for wireless communication. The XR16L784IV generates interrupts to signal the CPU when data is available for reading or when the transmit FIFO is empty. This interrupt capability allows the CPU to perform other tasks while waiting for serial communication events. It typically uses a 3.3V power supply and is available in a variety of packages. The device is often used in embedded systems requiring multiple serial communication interfaces, providing a compact and versatile solution.