XR21V1412_10 Datasheet, PDF (1/30 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART

XR21V1412
2-CH FULL-SPEED USB UART
SEPTEMBER 2010
REV. 1.1.0
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 TX 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.
WHQL certified software drivers for Windows 2000,
XP, Vista, 7, and CE, as well as Linux and Mac are
supported for the XR21V1412.
APPLICATIONS
• Portable Appliances
• External Converters (dongles)
• Battery-Operated Devices
• Cellular Data Devices
• Factory Automation and Process Controls
• Industrial applications
FEATURES
• USB 2.0 Compliant, Full-Speed (12 Mbps)
s Supports USB suspend, resume and remote
wakeup operations
• Enhanced Features of each UART
s Data rates up to 12 Mbps
s Fractional Baud Rate Generator
s 128 byte TX FIFO
s 384 byte RX FIFO
s 7, 8 or 9 data bits
s 1 or 2 stop bits
s Odd, even, mark, space or no parity
s Automatic Hardware (RTS/CTS or DTR/DSR)
Flow Control
s Automatic Software (Xon/Xoff) Flow Control
s Multidrop mode
s Auto Transceiver Enable
s Half-Duplex mode
s 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 WHQL certified drivers
s Windows 2000, XP, Vista and 7
s Windows CE 4.2, 5.0, 6.0
s Linux
s Mac
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com