XR21V1414
4-CH FULL-SPEED USB UART
REV. 1.1.0
SEPTEMBER 2010
FEATURES
GENERAL DESCRIPTION
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USB 2.0 Compliant, Full-speed (12 Mbps)
The XR21V1414 (V1414) is an enhanced 4-channel
USB Universal Asynchronous Receiver and
Transmitter (UART). 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.
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Supports USB suspend, resume and remote
wakeup operations
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Enhanced Features of each UART
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Data rates up to 12 Mbps
Fractional Baud Rate Generator
128 byte TX FIFO
The V1414 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.
384 byte RX FIFO
7, 8 or 9 data bits
1 or 2 stop bits
Odd, even, mark, space, or no parity
The large 128-byte TX FIFO and 384-byte RX FIFO
of the V1414 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
Automatic Hardware (RTS/CTS or DTR/DSR)
Flow Control
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Automatic Software (Xon/Xoff) Flow Control
Multidrop mode
Auto Transceiver Enable
Half-Duplex mode
further
simplifies
typical
multidrop
RS-485
applications.
Selectable GPIO or Modem I/O
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Internal 48 MHz clock
The V1414 operates from a single 2.97 to 3.63 volt
power supply and has 5V tolerant inputs. The V1414
is available in a 48-pin TQFP package.
Single 2.97-3.63V power supply
5V tolerant inputs
WHQL certified software drivers for Windows 2000,
XP, Vista, 7, and CE, as well as Linux and Mac are
supported for the XR21V1414.
48-pin TQFP package
Virtual COM Port WHQL certified drivers
APPLICATIONS
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Windows 2000, XP Vista and 7
Windows CE 4.2, 5.0, 6.0
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Portable Appliances
Linux
Mac
External Converters (dongles)
Battery-Operated Devices
Cellular Data Devices
Factory Automation and Process Controls
Industrial applications
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com