XR17V252

www.DataSheet4U.com MARCH 2006 XR17V252 66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT REV. 1.0.1 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. The V252 consists of two independent UART channels, each with set of configuration and enhanced registers, 64 bytes of Transmit (TX) and Receive (RX) FIFOs, and a fractional Baud Rate Generator (BRG). A global interrupt source register provides a complete interrupt status indication for both channels to speed up interrupt parsing. The V252 device operates at 33/66MHz and features fully programmable TX and RX FIFO level triggers, automatic hardware and software flow control, and automatic RS-485 half duplex direction control output for software and hardware design simplification. NOTE 1: Covered by U.S. Patents #5,649,122 and #5,949,787 Multi-port RS-232/RS-422/RS-485 Cards Point-of-Sale Systems FEATURES High performance 32-bit 66MHz PCI UART PCI 3.0 compliant PCI power ma...