MAX3140EEI-T Maxim Integrated, MAX3140EEI-T Datasheet - Page 28
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MAX3140EEI-T
Manufacturer Part Number
MAX3140EEI-T
Description
UART Interface IC
Manufacturer
Maxim Integrated
Type
SPI/MICROWIRE-Compatible UART with Integrated ESD-Protected RS-485/RS-422 Transceiverr
Datasheet
1.MAX3140EEI-T.pdf
(36 pages)
Specifications of MAX3140EEI-T
Data Rate
115 Kbps, 500 Kbps, 10Mbps
Supply Voltage - Max
5.25 V
Supply Voltage - Min
4.75 V
Supply Current
0.7 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Description/function
SPI/MICROWIRE-Compatible UART with integrated RS-485/RS-422 transceivers
Mounting Style
SMD/SMT
Operating Supply Voltage
5 V
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
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
Figure 20. Line Repeater in Full-Duplex Mode
Figure 22. System Differential Voltage at 100kHz Driving 4000
Feet of Cable with SRL = V
28
V
______________________________________________________________________________________
A
- V
RO
DI
B
RO
DE
RE
DI
D
R
CC
A
B
Z
Y
2μs/div
120Ω
120Ω
Typical Applications
(FULL DUPLEX)
MAX3140
DATA IN
DATA OUT
5V/div
1V/div
5V/div
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).
Figure 21. System Differential Voltage at 50kHz Driving 4000
Feet of Cable with SRL = Unconnected
Figure 23. System Differential Voltage at 200kHz Driving 4000
Feet of Cable with SRL = GND
V
V
A
A
- V
- V
RO
RO
DI
DI
B
B
5μs/div
1μs/div
5V/div
1V/div
5V/div
5V/div
1V/div
5V/div