XR21B1411 (B1411) 是一款增强型、带USB接口的通用异步收发器。其USB接口完全符合全速USB 2.0标准并支持12Mbps的USB数据传输速率。USB接口还支持USB挂起、恢复和远程唤醒操作。
B1411的板载OTP可以借助USBD+ / USBD-引脚,对厂商和产品的ID、总线/自供电模式、远程唤醒支持或最高功耗值、以及默认波特率设置进行编程设计。
B1411为5V单电源供电,提供16-pin QFN封装。
XR21B1411支持Windows 7、2000、XP、Vista和CE、以及Linux和Mac等系统的软件驱动程序。
如需任何有关UART的技术支持或获取本产品的IBIS模型,请电邮Exar UART技术支持组Exar's UART Technical Support group.
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  • USB D+/USB D-引脚提供 ±15kV HBM ESD静电保护
  • 接口符合USB 2.0规范
    • 支持12Mbps的USB全速数据传输速率
    • 支持USB挂起、恢复和远程唤醒操作
  • 增强型UART 特性
    • 数据传输速率高达12 Mbps
    • 分数波特率发生器
    • 128字节 TX FIFO
    • 384字节RX FIFO
    • 支持7、8或9位数据位
    • 支持1或2 位停止位
    • Odd, even, mark, space or no parity
    • 自动硬件流控制(RTS/CTS或DTR/DSR)
    • 自动软件流控制(Xon/Xoff)
    • 多点模式
    • 自动收发器控制
    • 半双工模式
    • 可选择的GPIO或Modem I/O
  • 带可编程时钟分频器的48MHz内部时钟,最低可调至6MHz
  • 5V单电源供电
  • 16-pin QFN封装
  • 虚拟COM端口驱动,支持以下操作系统
    • Windows 7, 2000, XP 以及Vista
    • Windows CE 4.2, 5.0, 6.0
    • Linux
    • Mac


  • 便携式设备
  • 外部转换器(加密狗)
  • 电池供电设备
  • 蜂窝数据设备
  • 工厂自动化和过程控制
  • 工业应用

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Design Tools

Evaluation Hardware and Software
Operating System Driver Version Release Date File
Linux 3.6.x and Newer 1C 一月 2017
Windows XP, Vista, 7, 8 三月 2016
Android Application 1C 十一月 2015
Windows XP, Vista, 7, 8, 8.1, 10 八月 2015
Linux 2.6.18 to 3.4.x 1A 一月 2015
Sample USB UART GUI 十二月 2013
Mac 1.0.4 十月 2013
OTP Programming Tool 二月 2013


Pkg Code Details Quantities Dimensions PDF
QFN16 3x3
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 33.3ºC/W
  • Bulk Pack Style: Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 3.00
  • Width: 3.00
  • Thickness: 1.00
  • Lead Pitch: 0.50
QFN16 3x3
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic:
  • ThetaJA: 36.4ᵒC
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 490
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: 490
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 3.0
  • Width: 3.0
  • Thickness: 1.00
  • Lead Pitch: 0.5

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR21B1411IL16-B1-F OBS Suggested:
XR21B1411IL16-B2-F OBS Suggested:
XR21B1411IL16TR-F QFN16 3x3 -40 85 Active
XR21B1411ILTR-B1-F OBS Suggested:
XR21V1410IL16-F QFN16 3x3 -40 85 Active
XR21B1411IL-0A-EB 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.

Quality Documents

Additional Quality Documentation may be available, please contact customersupport@exar.com.
Distribution Date Description File
07/11/2017 Product Discontinuation Notification Product Discontinuation Notice 17-0623-02 r-1033.pdf
06/29/2017 Unify Package 16L 3X3 QFN lead length (L) range from 0.35-0.45 mm to 0.30-0.50 mm and add Pin1 indication. PCN 17-0623-01-1033.pdf
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
05/16/2016 XR21B1411C has been qualified and production released. Rev C has improved USB differential noise performance, replacing Rev B as production. The products listed above are affected. Switchover will be identified by date code. PCN 16-0519-01-01-1033.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
08/10/2011 Material change and a new assembly & test supplier (ASE, Kunshan). Business consolidation. PCN_11-0724-01-1033.pdf