1-Ch Full-Speed USB UART


The XR21V1410 is an enhanced 1-channel Universal Asynchronous Receiver and Transmitter (UART) with a USB interface. The USB interface is fully compliant to Full Speed USB 2.0 specification that supports 12 Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup operations.

The XR21V1410 operates from an internal 48MHz clock therefore no external crystal/oscillator is required like previous generation UARTs. With the fractional baud rate generator, any baud rate can accurately be generated using the internal 48MHz clock.

The large 128-byte Tx FIFO and 384-byte RX FIFO of the XR21V1410 helps to optimize the overall data throughput for various applications. The Automatic Transceiver Direction control feature simplifies both the hardware and software for half-duplex RS-485 applications. The multidrop (9-bit) mode with automatic half-duplex transceiver control feature further simplifies typical multidrop RS-485 applications.

The XR21V1410 operates from a single 2.97 to 3.63 volt power supply and has 5V tolerant inputs.

Software drivers for Windows 2000, XP, Vista, 7, 8, and CE, as well as Linux and Mac are supported for the XR21V1410.
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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  • USB 2.0 Compliant Interface
    • Supports 12 Mbps USB full-speed data rate
    • Supports USB suspend, resume and remote wakeup operations
  • Enhanced UART Features
    • Data rates up to 12 Mbps
    • Fractional Baud Rate Generator
    • 128 byte TX FIFO
    • 384 byte RX FIFO
    • 7, 8 or 9 data bits, 1 or 2 stop bits
    • Automatic Hardware (RTS/CTS or DTR/DSR)Flow Control
    • Automatic Software (Xon/Xoff) Flow Control
    • Multidrop mode w/ Auto Half-Duplex Transceiver Control
    • Multidrop mode w/ Auto TX Enable
    • Half-Duplex mode
    • Selectable GPIO or Modem I/O
  • Internal 48 MHz clock
  • Single 2.97-3.63V power supply
  • 5V tolerant inputs
  • Virtual COM Port Drivers
    • Windows 2000, XP, Vista, 7, and 8
    • Windows CE 4.2, 5.0, 6.0, and 7.0
    • Linux
    • Mac


  • Portable Appliances
  • External Converters (Dongles)
  • Battery-Operated Devices
  • Cellular Data Devices
  • Factory Automation and Process Controls
  • Industrial Applications

Product Change Notification, Revision B to D

Download Software Drivers

Design Tools

Simulation Models
Package Type Vcc Temp Mode Version File
QFN 3.3V Industrial USB 2
Evaluation Hardware and Software
Operating System Driver Version Release Date File
Linux 3.6.x and Newer 1C January 2017
Windows XP, Vista, 7, 8 March 2016
Android Application 1C November 2015
Windows XP, Vista, 7, 8, 8.1, 10 August 2015
Linux 2.6.18 to 3.4.x 1A January 2015
Sample USB UART GUI December 2013
Mac 1.0.4 October 2013
XR21V141x Linux EEPROM Programming Utility 2.0.0 April 2013
XR21V141x Windows EEPROM Programming Utility December 2012


Pkg Code Details Quantities Dimensions PDF
QFN16 3x3 OPT1
  • JEDEC Reference: MO-220
  • MSL Pb-Free:
  • MSL SnPb Eutectic:
  • ThetaJA:
  • Bulk Pack Style:
  • Quantity per Bulk Pack:
  • Quantity per Reel:
  • Quantity per Tube:
  • Quantity per Tray:
  • Reel Size (Dia. x Width x Pitch):
  • Tape & Reel Unit Orientation:
  • Dimensions:
  • Length: 3.0
  • Width: 3.0
  • Thickness: 0.9
  • Lead Pitch:

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR21V1410IL16-F QFN16 3x3 OPT1 -40 85 Active
XR21V1410IL16TR-F QFN16 3x3 OPT1 -40 85 Active
XR21V1410IL-A1-F OBS Suggested:
XR21V1410TR-A1-F OBS Suggested:
XR21V1410-0A-EB Board Active
XR21V1410-0C-EB Board Active
XR21V1410IL-0B-EB Board Active
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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
02/14/2017 Qualification of alternate assembly subcon, GREATEK, Taiwan. PCN 17-0102-01 Greatek-1033.pdf
01/31/2017 Addition of qualified 12 inch wafer processing line in Global Foundries, in addition to the currently qualified 8 inch wafer processing. Note: Reliability report will be available February 17, 2017. PCN 16-0731-01-01 12 inch Global Foundries-1033.pdf
01/27/2017 Qualification of alternate assembly subcon, ANST, China. PCN 16-1145-04-01 ANST-1033.pdf
09/02/2015 Metal mask change for yield improvement Process change PCN 14-1145-02-1033.pdf
04/02/2014 Qualified UTAC Thailand for assembly using copper wire or gold wire bonding assembly, in addition to the current qualified gold wire bonding assembly sites, Unisem Batam and UTAC China. Material change and alternate assembly site. PCN_13-0729-02-1033.pdf
10/03/2013 Product Discontinuation Notification Discontinued. PDN_13-1003-01-1033.pdf
03/30/2012 XR21V141x Product Change from Rev B to Rev D Product improvement. PCN_12-0305-01-1033.pdf
08/10/2011 Material change and a new assembly & test supplier (ASE, Kunshan). Business consolidation. PCN_11-0724-01-1033.pdf
01/26/2011 Packing / Shipping: Bulk packing change from tray to canister Packing standardization for 3x3mm QFN. PCN_10-1217-01-1033.pdf
08/04/2010 1. Standardize pin #1 orientation in the reel per Attachment A. 2. Standardize # of units per reel per Attachment A. Refer to PCN for more information. Standardization PCN_10-0716-01-1033.pdf