66 MHz Octal PCI UART


The XR17V2581 (V258) is a single chip 8-channel 66MHz PCI (Peripheral Component Interconnect) UART (Universal Asynchronous Receiver and Transmitter) solution, optimized for higher performance and lower power. The V258 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 of products in a 144-pin LQFP package.

The V258 consists of eight 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 all 8-channels to speed up interrupt parsing. The V258 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

For UART technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.

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  • High performance 32-bit 66MHz PCI UART
  • PCI 3.0 compliance
  • PCI power management rev. 1.1 compliance
  • EEPROM interface for PCI configuration
  • 3.3V supply with 5V tolerant non-PCI (serial) inputs
  • Data read/write burst operation
  • Global interrupt register for all eight 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
  • Eight 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
    • Programmable data rate with prescaler
  • Pb-Free, RoHS Compliant Versions Offered


  • Remote Access Servers
  • Storage Network Management
  • Factory Automation and Process Control
  • Instrumentation
  • Multi-port RS-232/RS-422/RS-485 Cards
  • Point-of-Sale Systems

Download Software Drivers

Design Tools

Simulation Models
Evaluation Hardware and Software


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 42.0ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 750
  • Quantity per Tube: n/a
  • Quantity per Tray: 60
  • Reel Size (Dia. x Width x Pitch): 330 x 44 x 32
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 20
  • Width: 20
  • Thickness: 1.40
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR17V258IV LQFP144 -40 85 OBS
XR17V258IV-F LQFP144 -40 85 Active
XR17V258IVTR-F LQFP144 -40 85 EOL Suggested:
XR17V258IV-0A-EVB Board Active
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Distribution Date Description File
07/26/2016 Product discontinuation notification. Discontinued. PDN 16-0626-01-1033.pdf
12/05/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan) for assembly using copper or gold wire bonding. Material change and alternate assembly site. PCN_13-0521-02-1033.pdf
08/10/2011 Material change and a new assembly & test supplier (ASE, Kunshan). Business consolidation. PCN_11-0724-01-1033.pdf
04/11/2011 Product Discontinuation Notice In support of “green” initiatives, the listed leaded part numbers will be discontinued by Exar. PDN_11-0411-01-1033.pdf