DS21352LB (Maxim) PDF资料下载 Datasheet(128/137 页)

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型号：	DS21352LB
厂商：	Maxim Integrated Products
文件页数：	128/137页
文件大小：	0K
描述：	IC TXRX 1-CHIP T1 3.3V 100-LQFP
产品培训模块：	Lead (SnPb) Finish for COTS
产品变化通告：	Product Discontinuation 20/Feb/2012
标准包装：	90
功能：	单芯片收发器
接口：	HDLC，T1
电路数：	1
电源电压：	3.14 V ~ 3.47 V
电流 - 电源：	75mA
工作温度：	0°C ~ 70°C
安装类型：	表面贴装
封装/外壳：	100-LQFP
供应商设备封装：	100-LQFP（14x14）
包装：	托盘
包括：	DSX-1 和 CSU 线路补偿发生器，HDLC 控制器，带内回路代码发生器和检测器

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.

相关代理商/技术参数	参数描述
DS21352LB+	功能描述:网络控制器与处理器 IC T1 Single Chip Transceivers RoHS:否制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
DS21352LBN	制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS21352L-C02	功能描述:网络控制器与处理器 IC T1 Single Chip Transceivers RoHS:否制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
DS21352LN	功能描述:网络控制器与处理器 IC T1 Single Chip Transceivers RoHS:否制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
DS21352LN+	功能描述:网络控制器与处理器 IC T1 Single Chip Transceivers RoHS:否制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray

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