Exar
Corporation 48720 Kato Road, Fremont CA, 94538
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(510) 668-7000
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FAX (510) 668-7017
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www.exar.com
XR21V1414
4-CH FULL-SPEED USB UART
DECEMBER 2013 REV. 1.3.0
GENERAL DESCRIPTION
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.
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.
The large 128-byte TX FIFO and 384-byte RX FIFO
of the V1414 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 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.
WHQL certified software drivers for Windows 2000,
XP, Vista, 7, 8, and CE, as well as Linux and Mac are
supported for the XR21V1414.
APPLICATIONS
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Portable Appliances
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External Converters (dongles)
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Battery-Operated Devices
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Cellular Data Devices
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Factory Automation and Process Controls
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Industrial applications
FEATURES
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USB 2.0 Compliant, Full-speed (12 Mbps)
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Supports USB suspend, resume and remote
wakeup operations
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± 5 kV HBM ESD protection on USB data pins
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± 2 kV HBM ESD protection on all other pins
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Enhanced Features of each UART
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UART data rates up to 12 Mbps
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Fractional Baud Rate Generator
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128 byte TX FIFO
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384 byte RX FIFO
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7, 8 or 9 data bits
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1 or 2 stop bits
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Odd, even, mark, space, or no parity
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Automatic Hardware (RTS/CTS or DTR/DSR)
Flow Control
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Automatic Software (Xon/Xoff) Flow Control
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Multidrop mode
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Auto RS-485 Half-Duplex Control
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Half-Duplex mode
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Selectable GPIO or Modem I/O
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Internal 48 MHz clock
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Single 3.3V power supply
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5V tolerant inputs
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48-pin TQFP package
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Virtual COM Port WHQL certified drivers
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Windows 2000, XP Vista, Win7 and Win8
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Windows CE 4.2, 5.0, 6.0, 7.0
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Linux
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Mac
