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參數(shù)資料
| 型號(hào)： | MAX487 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers(250kbps,±15kvESD保護(hù),半雙工,RS-485/RS-232收發(fā)器) |
| 中文描述： | 低功耗、限擺率、RS-485/RS-422收發(fā)器 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 205K |
| 代理商： | MAX487 |
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Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, see
Figure 23.
Figures 19 and 20 show the system differential voltage
for the parts driving 4000 feet of 26AWG twisted-pair
wire at 110kHz into 120
loads.
T ypic al Applic ations
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 transceivers are designed for bidirectional data
communications on multipoint bus transmission lines.
Figures 21 and 22 show typical network applications
circuits. These parts can also be used as line
repeaters, with cable lengths longer than 4000 feet, as
shown in Figure 23.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as possi-
ble. The slew-rate-limited MAX483 and MAX487–MAX489
are more tolerant of imperfect termination.
M
Low-Power, S lew-Rate-Limited
RS -485/RS -422 Transc eivers
______________________________________________________________________________________
13
DI
V
Y
-V
Z
RO
5V
0V
1V
0V
-1V
5V
0V
2μs/div
DI
V
Y
-V
Z
RO
5V
0V
1V
0V
-1V
5V
0V
2μs/div
DI
RO
DE
RE
A
B
RE
RE
RE
RO
RO
RO
DI
DI
DI
DE
DE
DE
D
D
D
R
R
R
B
B
B
A
A
A
120
120
D
R
MAX481
MAX483
MAX485
MAX487
MAX1487
Figure 19. MAX481/MAX485/MAX490/MAX491/MAX1487
System Differential Voltage at 110kHz Driving 4000ft of Cable
Figure 20. MAX483, MAX487–MAX489 System Differential
Voltage at 110kHz Driving 4000ft of Cable
Figure 21. MAX481/MAX483/MAX485/MAX487/MAX1487 Typical Half-Duplex RS-485 Network
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX488 | Low-Power, Slew-Rate-Limited RS-485Transceivers(250kbps,全雙工, RS-485收發(fā)器) |
| MAX492 | Dual, Micropower, Single-Supply Rail-to-Rail Op Amps(輸入失調(diào)電壓500μV,單電源滿量程運(yùn)放) |
| MAX494 | Quad, Micropower, Single-Supply Rail-to-Rail Op Amps(輸入失調(diào)電壓500μV,單電源滿量程運(yùn)放) |
| MAX5003 | High-Voltage PWM Power-Supply Controller |
| MAX5003CEE | High-Voltage PWM Power-Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX487C/D | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX487C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX487CPA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX487CPA+ | 功能描述:RS-422/RS-485 接口 IC RS-485/RS-422 Transceiver RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX487CSA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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