XR21V1414IM-0B-EB Datasheet, PDF (2/34 Pages) Exar Corporation – 4-CH FULL-SPEED USB UART

XR21V1414
4-CH FULL-SPEED USB UART
FIGURE 1. XR21V1414 BLOCK DIAGRAM
3.3V VCC
GND
3.3V to 1.2V
Regulator
DATA+
DATA-
USB Slave
Interface
SDA
SCL
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. 1.3.0
TXA
RXA
GPIOA5/RTSA#/RS485A
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