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MAX3140EEI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
28 ______________________________________________________________________________________
120Ω
120Ω
DATA IN
DATA OUT
R
D
RO
RE
DE
DI
A
B
Z
Y
MAX3140
(FULL DUPLEX)
Figure 20. Line Repeater in Full-Duplex Mode
5μs/div
V
A
- V
B
DI
RO
1V/div
5V/div
5V/div
Figure 21. System Differential Voltage at 50kHz Driving 4000
Feet of Cable with SRL = Unconnected
2μs/div
V
A
- V
B
DI
RO
1V/div
5V/div
5V/div
Figure 22. System Differential Voltage at 100kHz Driving 4000
Feet of Cable with SRL = V
CC
1μs/div
V
A
- V
B
DI
RO
1V/div
5V/div
5V/div
Figure 23. System Differential Voltage at 200kHz Driving 4000
Feet of Cable with SRL = GND
Typical Applications
The MAX3140 is designed for bidirectional data com-
munications on multipoint bus transmission lines. The
RS-485 transceiver can be used in any RS-485 applica-
tion due to its numerous features and its programmabili-
ty. A typical half-duplex circuit for the MAX3140 is
shown in Figure 24, and a corresponding half-duplex
network is shown in Figure 25. A typical full-duplex cir-
cuit for the MAX3140 is shown in Figure 26, and a corre-
sponding full-duplex network is shown in Figure 27.
Since the MAX3140’s internal UART has IrDA capability,
a standard IR transceiver (e.g., the MAX3120) can be
used to provide IrDA communication (Figure 28).
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
______________________________________________________________________________________ 29
V
CC
R
Z
Y
RO
RTS
TX
RX
V
CC
H/F
SHDN
CTS
IRQ
DI
DE
RE*
RXP
TXP
X1
μP
X2
SRL
100k
D
HALF-DUPLEX
RS-485 I/O
UART
+5V
*NOTE: TO SHUT DOWN THE RS-485 TRANSCEIVER, DRIVE RE SEPARATELY.
V
CC
10k
MAX3140
DIN
DOUT
SCLK
CS
Figure 24. Typical Half-Duplex Operating Circuit
DI RO DE
RE
A
Z
RE
RERE
RO
RO
RO
DI
DI
DI
DE
DE
DE
D
D
D
R
R
R
B
B
B
A
A
Y
120Ω
120Ω
D
R
MAX3140
Figure 25. Typical Half-Duplex RS-485 Network
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
30 ______________________________________________________________________________________
R
Z
Y
B
A
RO
RTS
TX
RX
V
CC
SHDN
CTS
IRQ
DI
DE
RE*
RXP
TXP
X1
μP
X2
SRL
D
FULL-DUPLEX
RS-422 I/O
UART
*NOTE: TO SHUT DOWN THE RS-485 TRANSCEIVER, DRIVE RE SEPARATELY WITH AN I/O OF A μP.
MAX3140
H/F
V
CC
10k
DIN
DOUT
SCLK
CS
Figure 26. Typical Full-Duplex Operating Circuit
120Ω
120Ω
R
D
RO
RE
DE
DI
A
B
120Ω
120Ω
DI
RO RO
RO
DE
RE
RE
RE
Z
Z
Y
Y
A
A
A
BB
B
D
R
R
R
MAX3140
Figure 27. Typical Full-Duplex RS-422 Network
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36

MAX3140EEI

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Buy MAX3140EEI
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Description:
IC UART SPI RS485/422 28-QSOP
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New from this manufacturer.
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