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XR21V1414

4-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1414

4-CH FULL-SPEED USB UART

Pin Description

REV. 1.1.0

NAME

GPIOC1/CDC#

GPIOC2/DSRC#

GPIOC3/DTRC#

GPIOC4/CTSC#

GPIOC5/RTSC#

48-QFN

PIN #

28

27

26

25

24

TYPE

DESCRIPTION

I/O UART Channel C 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 C general purpose I/O or UART Data-Set-Ready input

(active low). See ”Section 1.5.5, 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 C general purpose I/O or UART Data-Terminal-Ready out-

put (active low). See ”Section 1.5.5, 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 C general purpose I/O or UART Clear-to-Send input

(active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware

Flow Control” on page 12. 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 C general purpose I/O or UART Request-to-Send output

(active low). See ”Section 1.5.4, Automatic RTS/CTS Hardware

Flow Control” on page 12. 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.

UART Channel D Signals

RXD

39

TXD

38

GPIOD0/RID#

37

GPIOD1/CDD#

34

I

UART Channel D 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 D Transmit Data or IR Transmit Data.

I/O UART Channel D general purpose I/O or UART Ring-Indicator 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 D 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.

6

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