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other parts : XR21V1412IL32-F  XR21V1412IL32TR-F 

Exar Corporation

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 as in 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 V1412 helps to optimize the overall data throughput for various applications. If required, the multidrop mode and automatic RS-485 half-duplex direction 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.
WHQL certified software drivers for Windows 2000, XP, Vista, 7, 8, and CE, as well as Linux and Mac are supported for the XR21V1412.

● USB 2.0 Compliant, Full-Speed (12 Mbps)
   ■ Supports USB suspend, resume and remote
      wakeup operations
   ■ ± 5 kV HBM ESD protection on USB data pins
   ■ ± 2 kV HBM ESD protection on all other pins
● Enhanced Features of each UART
   ■ 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
   ■ 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
● Single 3.3V power supply
● 5V tolerant GPIO inputs
● 32-pin QFN package
● Virtual COM Port WHQL certified drivers
   ■ Windows 2000, XP, Vista, Win7 and Win8
   ■ Windows CE 4.2, 5.0, 6.0, 7.0
   ■ Linux
   ■ Mac

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

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