The Exar ST16C654DCQ is a quad universal asynchronous receiver/transmitter (UART) with a FIFO. It is designed to provide flexible and reliable serial communication for a variety of applications. The UART provides four independent channels, each capable of handling asynchronous serial data transmission and reception. It includes a 16-byte FIFO (First-In, First-Out) buffer on each channel, which significantly reduces the CPU overhead required for managing serial communication.

Applications:

  
• Serial Communication Ports: Used to add multiple serial ports to computers and embedded systems.
  
• Multi-Port Serial Cards: Employed in multi-port serial cards for industrial and commercial applications.
  
• Data Acquisition Systems: Integrated into data acquisition systems for collecting and transmitting serial data from sensors and other devices.
  
• Modems and Communication Devices: Used in modems and other communication devices for serial data transmission.
  
• Industrial Automation: Deployed in industrial automation systems for communication with serial devices such as PLCs and HMIs.

Features:

  
• Quad UART: Provides four independent UART channels in a single chip.
  
• 16-Byte FIFO: Includes a 16-byte FIFO on each channel for buffering transmit and receive data.
  
• Programmable Baud Rate Generator: Allows for flexible baud rate selection.
  
• Modem Control Signals: Supports modem control signals such as RTS, CTS, DSR, DTR, and DCD.
  
• Interrupt Generation: Generates interrupts for various events, such as transmit buffer empty, receive data available, and error conditions.
  
• Software Compatible: Compatible with industry-standard UART functions.

Benefits:

  
• Increased System Throughput: FIFO buffers reduce CPU overhead and improve system throughput.
  
• Flexible Communication: Supports a wide range of baud rates and communication protocols.
  
• Simplified System Design: Integrates four UART channels in a single chip, reducing component count and board space.
  
• Improved Reliability: Provides error detection and correction features for reliable data transmission.
  
• Reduced CPU Load: Interrupt-driven operation minimizes CPU intervention, freeing up resources for other tasks.

Additional Details:

The ST16C654DCQ supports baud rates up to 1.5 Mbps. It provides full modem control capabilities, including RTS/CTS hardware flow control. The device is typically available in a PQFP (Plastic Quad Flat Package). The operating temperature range is generally from -40°C to +85°C. It also features a sleep mode to reduce power consumption when not in use.