XR21V1414(2009) 查看數據表（PDF） - Exar Corporation

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XR21V1414
(Rev.:2009)

4-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1414

4-CH FULL-SPEED USB UART

PIN DESCRIPTIONS

REV. 1.0.0

Pin Description

NAME

48-QFN

PIN #

TYPE

DESCRIPTION

UART Channel A Signals

RXA

31

TXA

30

GPIOA0/RIA#

21

GPIOA1/CDA#

20

GPIOA2/DSRA#

17

GPIOA3/DTRA#

16

GPIOA4/CTSA#

7

GPIOA5/RTSA#

6

I

UART Channel A 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 A Transmit Data or IR Transmit Data.

I/O General purpose I/O or UART Ring-Indicator input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Carrier-Detect input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Data-Set-Ready input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Data-Terminal-Ready output (active low).

This pin has an internal pull-up resistor. Internal pull-up resistor is disabled

during suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Clear-to-Send input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Request-to-Send output (active low). This

pin has an internal pull-up resistor. Internal pull-up resistor is disabled dur-

ing suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

UART Channel B Signals

RXB

9

TXB

8

GPIOB0/RIB#

15

GPIOB1/CDB#

14

I

UART Channel B 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 B Transmit Data or IR Transmit Data.

I/O General purpose I/O or UART Ring-Indicator input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

I/O General purpose I/O or UART Carrier-Detect input (active low). This pin

has an internal pull-up resistor. Internal pull-up resistor is disabled during

suspend mode. If using this GPIO as an input, a pull-up resistor is

required to minimize the power consumption in the suspend mode.

4

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