
Description
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 MaxLinear’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
Features
- 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
Documentation
-
Datasheet
-
Application Notes
- DAN-183, Migrating from the XR17D15X to the XR17V25X
- DAN-190, Exar UARTs in RS-485 Applications
- DAN-189, Exar UARTs in GPS Applications
- AN-204, UART Sleep Mode
- AN 209 - Windows & Linux API interface code for PCI/PCIe UARTs’ drivers
- AN-225 - Installing and Testing a PCI/PCIe UART Serial Port Using a Custom MaxLinear Driver in Linux
- dan112.pdf
-
Manuals
-
Software
-
Product Flyer
-
Product Brochure
Application
- 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
Design Tools
Operating System | Driver Version | Release Date | File |
---|---|---|---|
Windows 10 | 5.5.0.0 | September 2020 | |
Linux 2.6.32 and newer | 2.6.0.0 | August 2019 | |
PCI UART EEPROM Programming Utility | July 2017 | ||
Windows XP, Vista, 7, 8, 8.1 | 5.3.0.0 | September 2015 | |
Linux 2.6.31 | 1.0.0 | June 2010 | |
Linux 2.4.x | 1.0.0 | December 2009 | |
Linux 2.6.8 | 1.0.0 | December 2009 | |
Linux 2.6.16 | 1.0.0 | December 2009 | |
Linux 2.6.18 | 1.0.0 | December 2009 | |
Linux 2.6.21 | 1.0.0 | December 2009 |
Packaging
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Buy Now | Order Samples |
---|---|---|---|---|---|---|
XR17V258IV | LQFP144 | -40 | 85 | OBS |
Suggested: XR17V258IV-F |
|
XR17V258IV-F | LQFP144 | -40 | 85 | NRND |
Suggested: XR17V358IB176-F |
|
XR17V258IVTR-F | LQFP144 | -40 | 85 | OBS |
Suggested: XR17V258IV-F |
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.
Quality & Environmental Data
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|
XR17V258IV-F | N | Y | Y | Y | L3 / 260ᵒC | LQFP144 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.
Frequently Asked Questions
For some UARTs, Microsoft certified drivers are available for Windows Operating System and can be downloaded via Windows Update. These drivers and others, including for Linux and other Operating Systems can be found by visiting https://www.exar.com/design-tools/software-drivers Please note Software Driver Use Terms.
Click on the version link under Driver Version of the desired type of UART, part number and operating system. A zip file is downloaded which contains a ReadMe file with instructions.
Links to datasheets and product family pages are in the software driver table for easy reference.The XR17Cxxx, XR17Dxxx, and XR17Vxxx are all UARTs but have the following basic differences:
- PCI UARTs
- XR17Cxxx – 5V supply, up to 33MHz clock input
- XR17Dxxx – 5V or 3.3V supply, up to 33MHz clock input
- XR17V2xx – 3.3V supply, up to 66MHz clock input
- PCIe UARTs
- XR17V3xx – 3.3V supply, up to 125MHz clock input
https://www.exar.com/quality-assurance-and-reliability/lead-free-program
In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result. This brings you to the product page. For example:
Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:
Notice the status column and the “Show obsolete parts” link. A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:
Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:
And then Product Change Notifications:
Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:
If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.
1. Native drivers: Native drivers may be found in all major OS such as Windows, Linux, and Max OSX. Typically these drivers will be automatically loaded. In some cases, these are basic drivers and may have limitations on advanced device functionality, however. USB HID, Hub and CDC-ACM drivers are examples of native drivers. The CDC-ACM driver be used with our CDC-ACM class USB UARTs, but has limited functionality.
2. MaxLinear custom drivers: MaxLinear custom drivers may be used to support additional functionality in MaxLinear devices. For example, the MaxLinear custom driver for USB UARTs overcomes the limitations of the native CDC-ACM driver. See https://www.exar.com/design-tools/software-drivers for a list of and access to the drivers that we currently have. In some cases, the MaxLinear driver can also be customized, or source code can be provided after executing a Software License Agreement.
Please check that all the following conditions are satisfied first.
- no interrupts pending (ISR bit-0 = 1)
- modem inputs are not toggling (MSR bits 0-3 = 0)
- RX input pin is idling HIGH • divisor (the value in DLL register) is non-zero
- TX and RX FIFOs are empty
Be sure sleep mode bit has been set to 1. If there are multiple UART channels, the sleep conditions must be true for all channels.
See more on Sleep Mode in AN204 UART Sleep Mode.
Yes. Note: some devices do have powersave mode. If UART goes into powersave mode, then the registers are not accessible.
See more on Sleep Mode in AN204 UART Sleep Mode.
Read LSR register to check whether the UART receives the data or not.
- If LSR value is 0x60, it means that either UART receiver FIFO doesn’t receive the data or the data in receiver FIFO has been read out before the read of LSR.
- If LSR value is 0x00, it means data is still in the THR (clock doesn’t oscillate to transmit data).
- If LSR value is 0xFF, it means either UART is in powersave mode or UART is powered off. For those devices with powersave mode, be sure that UARTS are not in powersave mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
- Check whether the register set can be accessed.
- Check whether the crystal is oscillating fully.
- Check whether the data can be transmitted in internal loopback mode.
See more on Sleep Mode in AN204 UART Sleep Mode.
Submit a Technical Support Question As a New Question