參數(shù)資料
型號: MAX3140CEI+T
廠商: Maxim Integrated Products
文件頁數(shù): 21/36頁
文件大?。?/td> 0K
描述: IC UART W/RS485 28-QSOP
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
特點: 收發(fā)器
FIFO's: 8 字節(jié)
規(guī)程: RS232,RS485
電源電壓: 4.75 V ~ 5.25 V
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 28-QSOP
供應商設備封裝: 28-QSOP
包裝: 帶卷 (TR)
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
28
______________________________________________________________________________________
120
Ω
120
Ω
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
5
μs/div
VA - VB
DI
RO
1V/div
5V/div
Figure 21. System Differential Voltage at 50kHz Driving 4000
Feet of Cable with SRL = Unconnected
2
μs/div
VA - VB
DI
RO
1V/div
5V/div
Figure 22. System Differential Voltage at 100kHz Driving 4000
Feet of Cable with SRL = VCC
1
μs/div
VA - VB
DI
RO
1V/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).
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