xr21v1412 Exar Corporation, xr21v1412 Datasheet

xr21v1412

Manufacturer Part Number

xr21v1412

Description

2-ch Full-speed Usb Uart

Manufacturer

Exar Corporation

Datasheet

1.XR21V1412.pdf (24 pages)

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Download datasheet (639Kb)

JUNE 2009

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 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

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.

Software drivers for Windows 2000, XP, Vista, and

CE, as well as Linux and Mac are supported for the

XR21V1412.

APPLICATIONS

•

Exar

Portable Appliances

External Converters (dongles)

Battery-Operated Devices

Cellular Data Devices

Factory Automation and Process Controls

Industrial applications

Corporation 48720 Kato Road, Fremont CA, 94538

simplifies

typical

multidrop

RS-485

•

(510) 668-7000

FEATURES

•

USB 2.0 Compliant Interface

Enhanced Features of each UART

Internal 48 MHz clock

Single 2.97-3.63V power supply

5V tolerant inputs

32-pin QFN package

Virtual COM Port drivers

■

Supports 12 Mbps USB full-speed data rate

Supports USB suspend, resume and remote

wakeup operations

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

Automatic Hardware (RTS/CTS or DTR/DSR)

Flow Control

Automatic Software (Xon/Xoff) Flow Control

Multidrop

Transceiver Control

Multidrop mode w/ Auto TX Enable

Half-Duplex mode

Sleep Mode with Remote Wake-up

Selectable GPIO or Modem I/O

Windows 2000, XP and Vista

Windows CE 4.2, 5.0, 6.0

Linux

Mac

•

FAX (510) 668-7017

2-CH FULL-SPEED USB UART

mode

•

www.exar.com

Auto

XR21V1412

Half-Duplex

REV. 1.0.0

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