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XR21B1420IL28-0A Datasheet(PDF) 6 Page - Exar Corporation

Part # XR21B1420IL28-0A
Description  Enhanced 1-Ch Full-Speed USB UART
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR21B1420IL28-0A Datasheet(HTML) 6 Page - Exar Corporation

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XR21B1420
6 / 60
exar.com/XR21B1420
Rev 1A
Functional Block Diagram
USB Slave Interface
512-byte
TX FIFO
GPIOs/
ModemIO
TX
Internal
Oscillator
(48MHz)
USBD+
USBD-
512-byte
RX FIFO
GPIO9/RXT
GPIO8/TXT
GPIO7/RS485
GPIO6/CLK
GPIO5/RTS#/RS485
GPIO4/CTS#
GPIO3/DTR#
GPIO2/DSR#
GPIO1/CD#
GPIO0/RI#/RWK#
UART
Fractional
BRG
Internal
Status and
Control
Registers
VCC_REG
GND
OTP
USB
Descriptors
LDO
3V3
VCC
VBUS_SENSE
RESET#
RX
USB_STAT1
USB_STAT2


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