Datasheet > 10/100

10/100

更新时间： 2024-09-08 23:17:03

品牌	Logo	应用领域
其他 - ETC		以太网局域网（LAN）标准
页数	文件大小	规格书
3页	143K
描述
10/100 Ethernet Protection with SRV05-4 (142k)

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

10/100 数据手册

SI01-17

Surging Ideas

TVS Diode Application Note

PROTECTION PRODUCTS

10/100 ETHERNET PROTECTION

the Ethernet chip. The challenge is to find a TVS

(transient voltage suppressor) that will clamp low

enough as to prevent latch-up or damage to the

Ethernet IC. Also, the protection device must add

minimal loading capacitance as high parasitic capaci-

tance can cause significant degradation to the

100Mbps signal.

10/100 Ethernet ICs are vulnerable to damage from

electrostatic discharge (ESD). The fatal discharge may

originate from a charged cable or a “human body”.

Furthermore, devices used in telecommunications

equipment may be exposed to lightning induced tran-

sients. This application note illustrates a protection

circuit suitable for use in 10/100 Ethernet applica-

tions.

Semtech’s SRV05-4 meets all these criteria. The

circuit diagram of SRV05-4 is shown in Figure 1. It is

in a SOT-23 6L package and may be used to protect

two high-speed line pairs. The SRV05-4 combines

performance with proprietary process technology to

produce a low clamping voltage and capacitance

(typically 3pF line-to-ground and 1pF line-to-line) device

at an operating voltage of 5V. The 8kV contact ESD

response of the SRV05-4 can be seen in Figure 2.

Figure 3 shows the capacitance verse reverse voltage

curve. A plot of the SRV05-4 insertion loss from 3kHz

to 3GHz is shown in Figure 4. An eye pattern of the

SRV05-4 operating at 125MHz is shown in Figure 5 in

a line-to-ground configuration and in Figure 6 in a line-

to-line configuration. Figure 2 through 6 shows that

the SRV05-4 will maintain the Ethernet signal integrity

without attenuation. It also offers superior protection

to meet IEC 61000-4-2 level 4 (ESD – 15kV air and

8kV contact), IEC 61000-4-4, level 4 EFT and IEC

61000-4-5 16A (8 x 20µs) lightning surge.

The original 10Base-T Ethernet chips were fairly large

geometry CMOS products that were not very sensitive

to static over-voltage. Newer 10/100 Ethernet de-

vices however have become extremely sensitive to

latch-up or damage as IC manufacturers have moved

to 0.35-micron and smaller line widths. These small

geometries are sensitive to fatal electrostatic dis-

charges that may originate from a charged cable,

lightning or a “human body”.

One of the most common electrostatic discharges is a

Cable Discharge Event (CDE). An Ethernet cable can

store up energy that will discharge into the circuit when

the cable is plugged into the connector causing a CDE.

Another frequent phenomenon is human thumbing of

the connectors of the cable. This charges each of the

connections that will discharge into the circuit upon

contact. Lightning can also induce high voltage onto

the lines that can be transferred to the protected IC.

Discharge from any source into the Ethernet interface

will charge the secondary windings of its transformer.

Once the surge is removed, the secondary winding will

stop charging and will transfer its stored energy to the

primary side where the protected IC sits. The internal

protection in the PHY chip, if any, often is not enough

due to the high energy of the discharges. If the dis-

charge is catastrophic, it will destroy the protected IC.

If it is less severe, it will cause latent failures that are

very difficult to find.

10/100 Ethernet operates at 125MHz clock over a

twisted pair interface. In a typical system, the twisted-

pair interface for each port consists of two differential

signal pairs: one for the transmitter and one for the

receiver, with the transmitter input being the most

sensitive to damage. The fatal discharge occurs

differentially across the transmit or receive line pair

and is capacitively coupled through the transformer to

SRV05-4

Figure 1 - SRV05-4 Schematic and Pin Configuration

Revision 09/14/2001

www.semtech.com

12 3

中文翻译

下载PDF

与10/100相关器件

型号	品牌	获取价格	描述	数据表
10/1008X046	EPCOS	获取价格	CAP,AL2O3,10UF,100VDC,20% -TOL,20% +TOL
10/10-85555	EPCOS	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 10V, 20% +Tol, 20% -Tol, 10uF
10/16-85555	EPCOS	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 16V, 20% +Tol, 20% -Tol, 10uF
10/63-85555	EPCOS	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum, 63V, 20% +Tol, 20% -Tol, 10uF
100	RIEDON	获取价格	Precision Wirewound Resistors
100	PRODUCTWELL	获取价格	SHIELDED SMT POWER INDUCTORS
100	E-SWITCH	获取价格	TOGGLE SWITCHES - MINIATURE
100.000MHZ49SMD/3/10/-20+70/32	EUROQUARTZ	获取价格	Parallel - 3Rd Overtone Quartz Crystal, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, RESIS
100.000MHZ49SMD/50/7.5/-10+60/SR	EUROQUARTZ	获取价格	Series - 3Rd Overtone Quartz Crystal, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, RESISTA
100.000MHZ49TSMD/3/10/-20+70/32	EUROQUARTZ	获取价格	Parallel - 3Rd Overtone Quartz Crystal, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, RESIS

与10/100相关文章

SL74HC10N：高性能三输入与非门解析
2024-09-03

65
AIC1781A 电池充电控制器深度解析
2024-09-03

55
Pickering新高压舌簧继电器亮相汽车测试博览会
2024-08-26

89
采用MCU+MPU双处理器架构实现的创新应用设计探索
2024-08-23

100

产品中心

服务支持

精选活动

关于我们

帮助中心

10/100

10/100 数据手册

与10/100相关器件

与10/100相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

10/100

10/100 数据手册

与10/100相关器件

与10/100相关文章

您还可以找

您在本页遇到什么问题？