GENERAL DESCRIPTION
The XR21V1412 (V1412) is an enhanced 2-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 V1412 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 FIFO and 384-byte RX FIFO of the V1412 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. If required, the multidrop (9-bit) mode with automatic half-duplex transceiver control feature further simplifies typical multidrop RS-485 applications.
The V1412 operates from a single 2.97 to 3.63 volt power supply and has 5V tolerant inputs. The V1412 is available in a 32-pin QFN package.
Software drivers for Windows 2000, XP, Vista, and CE, as well as Linux and Mac are supported for the XR21V1412.

FEATURES
● USB 2.0 Compliant Interface
   ■ Supports 12 Mbps USB full-speed data rate
   ■ Supports USB suspend, resume and remote
      wakeup operations
● Enhanced Features of each UART
   ■ 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
   ■ Sleep Mode with Remote Wake-up
   ■ Selectable GPIO or Modem I/O
● Internal 48 MHz clock
● Single 2.97-3.63V power supply
● 5V tolerant inputs
● 32-pin QFN package
● Virtual COM Port drivers
   ■ Windows 2000, XP and Vista
   ■ Windows CE 4.2, 5.0, 6.0
   ■ Linux
   ■ Mac

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