The ST16C654DIQ64 is a Quad Universal Asynchronous Receiver/Transmitter (UART) with a FIFO manufactured by Exar Corporation. It is designed to provide asynchronous serial communication with enhanced features, making it suitable for a wide range of applications that require multiple serial ports. This UART offers significant improvements over standard UARTs, including deeper FIFOs, automatic hardware/software flow control, and support for various serial communication protocols.

Applications:

  
• Multi-port serial cards:  Used in PCs and servers to add multiple serial ports.
  
• Industrial automation:  For connecting to various serial devices like PLCs, sensors, and actuators.
  
• Point-of-sale (POS) systems:  To interface with printers, barcode scanners, and other peripherals.
  
• Networking equipment: In routers, switches, and hubs for console management and out-of-band management.
  
• Embedded systems: For communication with serial devices in embedded applications.

Features:

  
• Four independent UART channels: Provides four full-duplex asynchronous serial channels.
  
• 64-byte transmit and receive FIFOs: Reduces CPU overhead by buffering data.
  
• Programmable baud rate generator: Supports a wide range of baud rates.
  
• Automatic hardware/software flow control: Prevents data loss due to buffer overflow.
  
• Modem control signals: Supports full modem control functionality.
  
• Interrupt identification: Prioritizes interrupts for efficient interrupt handling.
  
• DMA support: Allows for high-speed data transfer without CPU intervention.
  
• Low power operation: Consumes minimal power, making it suitable for portable applications.

Benefits:

  
• Increased system performance: Deep FIFOs and DMA support reduce CPU load, improving overall system performance.
  
• Reliable data communication: Automatic flow control ensures data integrity.
  
• Flexible configuration: Programmable baud rates and interrupt settings allow for customization.
  
• Reduced system cost: Integrated UARTs reduce the need for external components.
  
• Easy integration: Standard interface simplifies system design and integration.

Technical Specifications:

The ST16C654DIQ64 operates from a 3.3V or 5V power supply. It is typically packaged in a 64-pin QFP package. The device supports data rates up to 3 Mbps and includes built-in loopback testing capabilities. It's compatible with industry-standard UART protocols and supports various interrupt modes.