xr20m1280 Exar Corporation, xr20m1280 Datasheet - Page 11

• Manufacturer Part Number: xr20m1280
• Description: I2c/spi Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

REV. P1.1.1
The M1280 is typically used with RS-232, RS-485 and IR transceivers. The following figure shows typical
connections from the UART to the different transceivers. For more information on RS-232 and RS-485/422
transceivers, go to www.exar.com or send an e-mail to [e-mail].
F
1.2
IGURE
10. XR20M1280 T
Serial Interface
UART
U A R T
YPICAL
VCC_UART
V C C _ U A R T
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
RTS#
DTR#
DSR#
CTS#
GND
CD#
RI #
TX
RX
S
R S -2 3 2 F u ll- M o d e m S e r ia l In te r fa c e
D T R #
D S R #
R T S #
C T S #
G N D
RS-485 Full-Duplex Serial Interface
C D #
ERIAL
R I#
T X
R X
NC
NC
I
NTERFACE
VCC_UART
VCC_UART
V C C _ U A R T
PRELIMINARY
C
11
ONNECTIONS
VCC_UART
DI
RO
DE
RE#
Transceiver
Full-duplex
T ra n s c e iv e r
R 1 O U T
T 1 IN
T 2 IN
T 3 IN
R 2 O U T
R 5 O U T
R 3 O U T
R 4 O U T
G N D
RS-485
R S -2 3 2
TX+
TX-
RX+
RX-
XR20M1280