XR21V1414 Datasheet PDF - Exar Corporation
Part Number | XR21V1414 | |
Description | 4-Ch Full-Speed USB UART | |
Manufacturers | Exar Corporation | |
Logo | ||
There is a preview and XR21V1414 download ( pdf file ) link at the bottom of this page. Total 30 Pages |
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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
• 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 inputs
• 48-pin TQFP 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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REV. 1.3.0
Pin Description
NAME
TXB
GPIOB0/RIB#/
RWKB#
48-QFN
PIN #
8
15
GPIOB1/CDB#
14
GPIOB2/DSRB#
13
GPIOB3/DTRB#
12
GPIOB4/CTSB#
11
GPIOB5/RTSB#/
RS485B
10
UART Channel C Signals
RXC
23
TXC
GPIOC0/RIC#/
RWKC#
22
29
XR21V1414
4-CH FULL-SPEED USB UART
TYPE
DESCRIPTION
O UART Channel B Transmit Data or IR Transmit Data.
I/O UART Channel B general purpose I/O or UART Ring-Indicator input
(active low) or Remote Wakeup Input (See ”Section 1.5.12, USB Sus-
pend” on page 14.). This pin has an internal pull-up resistor which is
disabled during suspend mode. If using this GPIO as an input, an external
pull-up resistor is required to minimize the power consumption in the sus-
pend mode.
I/O UART Channel B general purpose I/O or UART Carrier-Detect input
(active low). This pin has an internal pull-up resistor which is disabled dur-
ing suspend mode. If using this GPIO as an input, an external pull-up
resistor is required to minimize the power consumption in the suspend
mode.
I/O UART Channel B general purpose I/O or UART Data-Set-Ready input
(active low). See ”Section 1.5.6, Automatic DTR/DSR Hardware
Flow Control” on page 13. This pin has an internal pull-up resistor
which is disabled during suspend mode. If using this GPIO as an input, an
external pull-up resistor is required to minimize the power consumption in
the suspend mode.
I/O UART Channel B general purpose I/O or UART Data-Terminal-Ready out-
put (active low). See ”Section 1.5.6, Automatic DTR/DSR Hard-
ware Flow Control” on page 13. This pin has an internal pull-up
resistor which is disabled during suspend mode. If using this GPIO as an
input, an external pull-up resistor is required to minimize the power con-
sumption in the suspend mode.
I/O UART Channel B general purpose I/O or UART Clear-to-Send input
(active low). See ”Section 1.5.5, Automatic RTS/CTS Hardware
Flow Control” on page 13. This pin has an internal pull-up resistor
which is disabled during suspend mode. If using this GPIO as an input, an
external pull-up resistor is required to minimize the power consumption in
the suspend mode.
I/O UART Channel B general purpose I/O or UART Request-to-Send output
(active low) or auto RS-485 half-duplex control. See ”Section 1.5.5,
Automatic RTS/CTS Hardware Flow Control” on page 13. This
pin has an internal pull-up resistor which is disabled during suspend mode.
If using this GPIO as an input, an external pull-up resistor is required to
minimize the power consumption in the suspend mode.
I UART Channel C Receive Data or IR Receive Data. This pin has an inter-
nal pull-up resistor. Internal pull-up resistor is not disabled during suspend
mode.
O UART Channel C Transmit Data or IR Transmit Data.
I/O UART Channel C general purpose I/O or UART Ring-Indicator input
(active low) or Remote Wakeup Input (See ”Section 1.5.12, USB Sus-
pend” on page 14.). This pin has an internal pull-up resistor which is
disabled during suspend mode. If using this GPIO as an input, an external
pull-up resistor is required to minimize the power consumption in the sus-
pend mode.
5
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