GENERAL DESCRIPTION
   The XR17L1541 (L154) is a quad PCI Bus Universal Asynchronous Receiver and Transmitter (UART) with same package and pin-out as the Exar XR17C158 octal UART. The device is designed to meet today’s 32-bit PCI Bus and high bandwidth requirement in communication systems. 

FEATURES
• High Performance Quad UART
• PCI Bus 2.2 Target Interface Compliance
• 3.3 Volt PCI Bus Compliant up to 33 MHz Clock
• 5 Volt Tolerant Serial Inputs
• 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
      Selectable Turn-around Delay (0 to 15 bit-times)
   • Infrared (IrDA 1.0) Data Encoder/Decoder
   • Programmable Data Rate with Prescaler
   • Up to 4 Mbps Serial Data Rate at 8X
• Eight Multi-Purpose Inputs/outputs
• General Purpose 16-bit Timer/Counter
• Sleep Mode with Automatic Wake-up
• Same Package and Pin-out as the XR17C158,
   XR17D158, XR17C154 and XR17D154 UARTs

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