GENERAL DESCRIPTION
   The XR21B1411 (B1411) is an enhanced 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.

FEATURES
● ±15kV HBM ESD on USBD+/USBD-
● USB 2.0 Compliant, Full-Speed (12 Mbps)
   ■ Supports USB suspend, resume and remote
      wakeup operations
● Unique preprogrammed USB serial number
● 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
   ■ Odd, even, mark, space or no parity
   ■ Automatic Hardware (RTS/CTS or DTR/DSR)
      Flow Control
   ■ Automatic Software (Xon/Xoff) Flow Control
   ■ Multidrop mode
   ■ Auto RS-485 Half-Duplex Control
   ■ Half-Duplex mode
   ■ Selectable GPIO or Modem I/O
● Internal 48 MHz clock with clock divisors
   programmable down to 6 MHz
● Single 5V power supply
● 5V tolerant inputs
● 16-pin QFN package
● Virtual COM Port WHQL/HCK Windows certified
   drivers
   ■ Windows 2000, XP, Vista, 7, 8, 8.1 and 10
   ■ Windows CE 4.2, 5.0, 6.0, 7.0
● Linux, Mac drivers

APPLICATIONS
● Portable Appliances
● External Converters (dongles)
● Battery-Operated Devices
● Cellular Data Devices
● Factory Automation and Process Controls
● Industrial applications