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XR21V1412IL32-F

2-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1412

2-CH FULL-SPEED USB UART

DECEMBER 2013

REV. 1.3.0

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 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.

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)

■ 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

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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