Datasheet

MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
______________________________________________________________________________________ 31
V
CC
UNCONNECTED
R
Z
Y
RO
RTS
TX
RX
V
CC
H/F
DIN
DOUT
SCLK
CS
IRQ
DI
DE
RE*
RXP
TXP
TX
RX
IrDA
I/O
μP
SRL
100k
D
HALF-DUPLEX
RS-485 I/O
*NOTE: TO SHUT DOWN THE RS-485 TRANSCEIVER, DRIVE RE SEPARATELY.
UART
IN
IrDA
MODE
+5V
SOFTWARE
NON-IrDA
UART
MAX3140
MAX3120
X1
X2
V
CC
10k
Figure 28. Typical IR and RS-485 Operating Circuit