參數資料
| 型號： | MC75174BDWG |
| 廠商： | ON Semiconductor |
| 文件頁數： | 2/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINEDRVR QUAD EIA485 20-SOICW |
| 產品變化通告： | Product Obsolescence 08/Apr/2011 |
| 標準包裝： | 38 |
| 類型： | 線路驅動器，發(fā)射器 |
| 驅動器/接收器數： | 4/0 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC |
| 包裝： | 管件 |
MC75172B, MC75174B
http://onsemi.com
10
Termination Resistors
Transmission line theory states that, in order to preserve
the shape and integrity of a waveform traveling along a
cable, the cable must be terminated in an impedance equal
to its characteristic impedance. In a system such as that
depicted in Figure 18, in which data can travel in both
directions, both physical ends of the cable must be
terminated. Stubs, leading to each receiver and driver,
should be as short as possible.
Leaving off the terminations will generally result in
reflections which can have amplitudes of several volts
above VCC or below ground. These overshoots and
undershoots can disrupt the driver and/or receiver
operation, create false data, and in some cases damage
components on the bus.
Figure 18. Typical EIA485 System
NOTES:
1.Terminating resistors RT must be located at the physical ends of the cable.
2.Stubs should be as short as possible.
3.Circuit ground of all drivers and receivers must be connected via a dedicated wire within the cable.
Do not rely on chassis ground or power line ground.
#8
TTL
R
TTL
#3
TTL
R
En
#2
TTL
En
TTL
R
TTL
#1
R
TTL
RT
#1
En
D
#3
D
#5
D
TTL
En
#6
R
TTL
R
En
#5
R
#6
D
#7
RT
TTL
R
En
TTL
#4
D
5 “off” drivers (@ 0.06 U.L. each),
+8 receivers (@ 1.0 U.L. each) = 8.3 Unit Loads
RT = 120 W at each end of the cable.
#4
D
#2
120
W
Twisted
Pair
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| VI-B3B-MW-S | CONVERTER MOD DC/DC 95V 100W |
| CY28446LFXCT | IC CLOCK CALISTOGA CK410M 64QFN |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC75174BDWR2 | 功能描述:RS-485接口IC Quad EIA-485 Line RoHS:否 制造商:Texas Instruments 數據速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MC75174BDWR2G | 功能描述:RS-485接口IC Quad EIA-485 Line Driver w/3 State Out RoHS:否 制造商:Texas Instruments 數據速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MC75174BP | 功能描述:RS-485接口IC Quad EIA-485 Line RoHS:否 制造商:Texas Instruments 數據速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MC75174BPG | 功能描述:RS-485接口IC Quad EIA-485 Line Driver w/3 State Out RoHS:否 制造商:Texas Instruments 數據速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MC7520D | 制造商:POSITRONIC INDUSTRIES, INC. 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: |
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