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型號：	DS21552G
廠商：	Maxim Integrated Products
文件頁數(shù)：	128/137頁
文件大小：	0K
描述：	IC TXRX T1 1-CHIP 5V 100-BGA
標準包裝：	1
功能：	單芯片收發(fā)器
接口：	E1，HDLC，J1，T1
電路數(shù)：	1
電源電壓：	4.75 V ~ 5.25 V
電流 - 電源：	75mA
工作溫度：	0°C ~ 70°C
安裝類型：	表面貼裝
封裝/外殼：	100-LFBGA，CSPBGA
供應商設備封裝：	100-CSBGA（10x10）
包裝：	托盤
包括：	DSX-1 和 CSU 線路補償發(fā)生器，HDLC 控制器，帶內(nèi)回路代碼發(fā)生器和檢測器

DS21352/DS21552

90 of 137

16.4 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 PCB 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 16-6 shows an example circuit for the 5 volt device and Figure 16-7 is an example for the 3.3

device. In both examples, fuses are used to provide protection against power line cross. 470 ohm input

resistors on the receive pair, a transient suppresser and a diode bridge on the transmit pair provide surge

protection. Resistors R1 – R4 provide surge protection for the fuse. Careful selection of the transformer

will allow the use of a fuse that requires no additional surge protection such as the circuit shown in Figure

16-7. The circuit shown in Figure 16-7 is required for 3.3 volt operation since additional resistance in the

transmit pair cannot be tolerated. For more information on line interface design, consult the T1 Line

Interface Design Criteria (note 353) and Secondary Over Voltage Protection (note 324) application notes.

These notes are available from Dallas Semiconductor’s web site.

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
DS21552GN	功能描述:IC TXRX T1 1-CHIP 5V 100-BGA RoHS:否類別:集成電路 (IC) >> 接口 - 電信系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標準包裝:750 系列:*
DS21552L	功能描述:網(wǎng)絡控制器與處理器 IC 5V T1 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21552L+	功能描述:網(wǎng)絡控制器與處理器 IC 5V T1 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21552LB	制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS21552LN	功能描述:網(wǎng)絡控制器與處理器 IC 5V T1 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray

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