GENERAL DESCRIPTION
   The XR17C1541 (154) is a quad PCI Bus Universal Asynchronous Receiver and Transmitter (UART) with same package and pin-out as the Exar XR17x158 octal UARTs. The device is designed to meet today’s 32-bit PCI Bus and high bandwidth requirements in communication systems. The global interrupt source register provides a complete interrupt status indication for all 4 channels to speed up interrupt parsing.

FEATURES
• High Performance Quad UART
• PCI Bus 2.2 Target Interface Compliance
• 5V PCI Bus Compliant up to 33MHz Clock
• 32-bit PCI Bus Interface with EEPROM Interface
• A Global Interrupt Source Register for all 4 UARTs
• Data Transfer in Byte, Word and Double-word
• Data Read/Write Burst Operation
• Each UART is independently Controlled with:
   • 16C550 Compatible 5G (Fifth Gen Register Set
   • 64-byte Transmit and Receive FIFOs
   • Transmit and Receive FIFO Level Counters
   • Automatic RTS/CTS or DTR/DSR Flow Control
   • Automatic Xon/Xoff Software Flow Control
   • Automatic RS485 Half-duplex Control Output
      with 16 Selectable Turn-around Delay
   • Infrared (IrDA 1.0) Data Encoder/Decoder
   • Programmable Data Rate with Prescaler
   • Up to 6.25 Mbps Serial Data Rate at 8X and 5V
• Eight Multi-Purpose Inputs/outputs
• A General Purpose 16-bit Timer/Counter
• Sleep Mode with Automatic Wake-up Indicator
• Same Package and Pin-out as the XR17C158,
   XR17D154 and XR17D158 UART
• 20x20x1.4mm 144-LQFP package

APPLICATIONS
• Remote Access Servers
• Ethernet Network to Serial Ports
• Network Management
• Factory Automation and Process Control
• Point-of-Sale Systems
• Multi-port RS-232/RS-422/RS-485 Cards