XR21B1411IL-0A-EB Datasheet, PDF (1/30 Pages) Exar Corporation – ENHANCED 1-CH FULL-SPEED USB UART

XR21B1411
ENHANCED 1-CH FULL-SPEED USB UART
JULY 2016
REV. 1.2.0
GENERAL DESCRIPTION
The XR21B1411 (B1411) is an enhanced 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 B1411 operates from an internal clock that is
programmable to 6, 12, 24 or 48 MHz. Therefore, no
external crystal / oscillator is required as in previous
generation UARTs. With the fractional baud rate
generator, any baud rate up to 12 Mbps can be
accurately generated using the internal clock.
The large 128-byte Tx FIFO and 384-byte Rx FIFO of
the B1411 help 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 Vendor ID, Product ID, bus-powered mode, self-
powered mode, remote wakeup support or maximum
power consumption values, as well as default baud
rate settings can be programmed using the on-board
OTP through the USBD+ / USBD- pins.
The B1411 operates from a single 5V power supply
and is available in a 16-pin QFN package.
WHQL certified software drivers for Windows 2000,
XP, Vista, 7, 8, 8.1, 10 and CE, as well as Linux and
Mac are supported for the XR21B1411.
APPLICATIONS
 Portable Appliances
 External Converters (dongles)
 Battery-Operated Devices
 Cellular Data Devices
 Factory Automation and Process Controls
 Industrial applications
FEATURES
 ±15kV HBM ESD on USBD+/USBD-
 USB 2.0 Compliant, Full-Speed (12 Mbps)
■ Supports USB suspend, resume and remote
wakeup operations
 Unique preprogrammed USB serial number
 Enhanced UART Features
■ 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 with clock divisors
programmable down to 6 MHz
 Single 5V power supply
 5V tolerant inputs
 16-pin QFN package
 Virtual COM Port WHQL/HCK Windows certified
drivers
■ Windows 2000, XP, Vista, 7, 8, 8.1 and 10
■ Windows CE 4.2, 5.0, 6.0, 7.0
 Linux, Mac drivers
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com