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| 型号： | SP207EET-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 3/19页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD LP 24SOIC |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 5/3 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP207E_0_052
RS and RV add up to 330 for IEC61000-4-2.
RC
Device
Under
Test
DC Power
Source
CS
RS
SW1
SW2
RV
Contact-Discharge Model
Figure 8. ESD Test Circuit for IEC6000-4-2
Figure9.ESDTestWaveformforIEC61000-4-2
The Contact Discharge Method applies the
ESDcurrentdirectlytotheEUT.Thismethod
was devised to reduce the unpredictability
of the ESD arc. The discharge current rise
time is constant since the energy is directly
transferred without the air-gap arc.
In situations such as hand held systems, the
ESD charge can be directly discharged to
theequipmentfromapersonalreadyholding
the equipment. The current is transferred
on to the keypad or the serial port of the
equipment directly and then travels through
thePCBandfinallytotheIC.
ThecircuitmodelinFigures7and8represent
the typical ESD testing circuit used for all
three methods. The C
S is initially charged
with the DC power supply when the first
switch(SW1)ison.
Now that the capacitor is charged, the sec-
ondswitch(SW2)isonwhileSW1switches
off. The voltage stored in the capacitor is
then applied through R
S, the current limiting
resistor,ontothedeviceundertest(DUT).
InESDtests,theSW2switchispulsedso
that the device under test receives a dura-
tion of voltage.
For the Human Body Model, the current
limitingresistor(R
S)andthesourcecapacitor
(C
S)are1.5kΩan100pF,respectively.For
IEC6000-4-2, the current limiting resistor
(R
S)andthesourcecapacitor(CS)are330Ω
an 50pF, respectively.
The higher C
S value and lower RS value in
the IEC6000-4-2 model are more stringent
than the Human Body Model. The larger
storage capacitor injects a higher voltage
tothetestpointwhenSW2isswitchedon.
The lower current limiting resistor increases
the current charge onto the test point.
t=0ns
t=30ns
0A
5A
30A
t
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP207EET-TR | 制造商:Exar Corporation 功能描述: |
| SP207EH | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
| SP207EHCA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
| SP207EHCA-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER RS-232 HI SPEED 207 |
| SP207EHCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
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