XR21V1414 View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR21V1414

4-CH FULL-SPEED USB UART

Exar Corporation 

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XR21V1414

4-CH FULL-SPEED USB UART

FIGURE 1. XR21V1414 BLOCK DIAGRAM

3.3V VCC

GND

USBD+

USBD-

SDA

SCL

USB Slave

Interface

I2C

Interface

Internal

48MHz

Oscillator

Fractional

BRG

128-byte

TX FIFO

384-byte

RX FIFO

Internal

Status and

Control

Registers

GPIOs/

Modem IO

UART Channel A

UART Channel B

(Same as Ch A)

UART Channel C

(Same as Ch A)

UART Channel D

(Same as Ch A)

REV. 1.1.0

TXA

RXA

GPIOA5/RTSA#

GPIOA4/CTSA#

GPIOA3/DTRA#

GPIOA2/DSRA#

GPIOA1/CDA#

GPIOA0/RIA#

TXB

RXB

GPIOB[5:0]/ModemIO

TXC

RXC

GPIOC[5:0]/ModemIO

TXD

RXD

GPIOD[5:0]/ModemIO

2

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