GENERAL DESCRIPTION
   The XR17V2521 (V252) is a single chip 2-channel 66MHz PCI UART (Universal Asynchronous Receiver and Transmitter) solution, optimized for higher performance and lower power. The V252 device with its fifth generation register set is designed to meet the high bandwidth and power management requirements for multi-serial communication ports for system administration and management. The 32-bit 66MHz PCI interface is compliant with PCI 3.0 and PCI power management revision 1.1 specifications. The device provides an upgrade path for Exar’s 33MHz 5V and Universal PCI UART family.

FEATURES
● High performance 32-bit 66MHz PCI UART
● PCI 3.0 compliant
● PCI power management rev. 1.1 compliant
● EEPROM interface for PCI configuration
● 3.3V supply with 5V tolerant non-PCI (serial) inputs
● Data read/write burst operation
● Global interrupt register for both UART channels
● Up to 8 Mbps serial data rate
● Eight multi-purpose inputs/outputs
● A 16-bit general purpose timer/counter
● Sleep mode with wake-up Indicator
● Two independent UART channels controlled with
   ■ 16C550 compatible register Set
   ■ 64-byte TX and RX FIFOs with level counters
      and programmable trigger levels
   ■ Fractional baud rate generator
   ■ Automatic RTS/CTS or DTR/DSR hardware
      flow control with programmable hysteresis
   ■ Automatic Xon/Xoff software flow control
   ■ RS-485 half duplex direction control output
      with selectable turn-around delay
● Infrared (IrDA 1.0) data encoder/decoder

APPLICATIONS
● Remote Access Servers
● Storage Network Management
● Factory Automation and Process Control
● Instrumentation