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SURGE

更新时间： 2024-02-04 05:33:49

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Surge Protection of ISDN S/T-Interfaces (89k)

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SURGE 数据手册

SI96-15

Surging Ideas

TVS Diode Application Note

PROTECTION PRODUCTS

Surge Protection of ISDN S/T-Interfaces

This application note describes how to implement

transient surge protection for ISDN S/T-interfaces.

The protection technique shown is suitable for use in

NT and TE equipment including PC-based ISDN adaptor

cards.

ISDN S/T-interface equipment may be exposed to

transient voltages from a variety of sources including

electrostatic discharge (ESD) and lightning. With expo-

sure of the S/T-interface bus to these transient volt-

ages, supplemental protection components are neces-

sary to protect the terminal equipment from damage or

reliability degradation.

Protection may be implemented on the line side or

device side of the transformer. Although line side

protection has less of an impact on impedance tem-

plates, it is more expensive than device side protection

schemes. Device side protection may have a greater

impact on impedance template margins due to capaci-

tance multiplication by the transformer. Due to the

nature of the transient stresses expected at S/T-

interfaces, line side surge protection is normally not

necessary.

Figure 1 -Enhanced Diode Bridge Protection Circuit

Figure 2 - ISDN S/T-Interface Circuit With Surge Protection

www.semtech.com

Revision 9/2000

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