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SP3232EBCA 参数 Datasheet PDF下载

SP3232EBCA图片预览
型号: SP3232EBCA
PDF下载: 下载PDF文件 查看货源
内容描述: 真正的+ 3.0V至+ 5.5V的RS - 232收发器 [True +3.0V to +5.5V RS-232 Transceivers]
分类和应用:
文件页数/大小: 20 页 / 149 K
品牌: SIPEX [ SIPEX CORPORATION ]
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R
R
S
S
R
R
C
C
SW2  
SW2  
SW1  
SW1  
Device  
Under  
Test  
DC Power  
Source  
C
C
S
S
Figure 18. ESD Test Circuit for Human Body Model  
The circuit models in Figures 18 and 19  
represent the typical ESD testing circuits used  
forallthreemethods. TheCS isinitiallycharged  
with the DC power supply when the first  
switch (SW1) is on. Now that the capacitor is  
charged, the second switch (SW2) is on while  
SW1 switches off. The voltage stored in the  
capacitor is then applied through RS, the current  
limiting resistor, onto the device under test  
(DUT). In ESD tests, the SW2 switch is pulsed  
so that the device under test receives a duration  
of voltage.  
The Contact Discharge Method applies the ESD  
current directly to the EUT. This method 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 the equipment from a  
person already holding the equipment. The  
current is transferred on to the keypad or the  
serial port of the equipment directly and then  
travels through the PCB and finally to the IC.  
Contact-Discharge Module  
Contact-Discharge Module  
R
R
R
R
S
S
R
R
V
V
C
C
SW2  
SW2  
SW1  
SW1  
Device  
Under  
Test  
DC Power  
Source  
C
C
S
S
R
R
and R add up to 330for IEC1000-4-2.  
and R add up to 330for IEC1000-4-2.  
S
S
V
V
Figure 19. ESD Test Circuit for IEC1000-4-2  
Rev. A Date:12/11/03  
SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers  
© Copyright 2003 Sipex Corporation  
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