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XR21V1414

4-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1414

4-CH FULL-SPEED USB UART

SEPTEMBER 2010

REV. 1.1.0

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. 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 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, and CE, as well as Linux and Mac are

supported for the XR21V1414.

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

• 48-pin TQFP 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 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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