參數(shù)資料
型號： DS21354L
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, PQFP100
封裝： 14 X 14 MM, LQFP-100
文件頁數(shù)： 112/126頁
文件大?。?/td> 1082K
代理商： DS21354L
DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
86 of 124
15.4.
Protected Interfaces
In certain applications, such as connecting to the PSTN, it is required that the network interface be
protected from and resistant to certain electrical conditions. These conditions are divided into two
categories, surge and power line cross. A typical cause of surge is lightening strike. Power-line cross
refers to accidental contact with high-voltage power wiring. For protection against surges, additional
components and PC board layout considerations are required to reroute and dissipate this energy. In a
surge event, the network interface must not be damaged and continue to work after the event. In the event
of a power line contact, components such as fuses or PTCs that can “open” the circuit are required to
prevent the possibility of a fire caused by overheating the transformer. The circuit examples in this data
sheet are for “Secondary Over Voltage Protection” schemes for the line terminating equipment. Primary
protection is typically provided by the network service provide and is external to the equipment.
Figure 15-6 shows an example circuit for the 5V device and Figure 15-7 is an example for the 3.3V
device. In both examples, fuses are used to provide protection against power-line cross. Surge protection
is provided by 470
W input resistors on the receive pair, a transient suppresser, and a diode bridge on the
transmit pair. Resistors R1 to R4 provide surge protection for the fuse. Careful selection of the
transformer allows the use of a fuse that requires no additional surge protection such as the circuit shown
in Figure 15-7. The circuit shown in Figure 15-7 is required for 3.3V operation since additional resistance
in the transmit pair cannot be tolerated. For more information on line interface design, consult the E1 Line
Interface Design Criteria and Secondary Overvoltage Protection application notes available on our
相關(guān)PDF資料
PDF描述
DS21354LN DATACOM, PCM TRANSCEIVER, PQFP100
DS21372TN SPECIALTY TELECOM CIRCUIT, PQFP32
DS21372T SPECIALTY TELECOM CIRCUIT, PQFP32
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DS2141AN DATACOM, FRAMER, PDIP40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21354L+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3/5V E1 Single Chip Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21354LB 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3/5V E1 Single Chip Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21354LB+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3/5V E1 Single Chip Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21354LC1 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3/5V E1 Single Chip Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21354LC1+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3/5V E1 Single Chip Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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