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VBUS054B-HSF-GS08 参数 Datasheet PDF下载

VBUS054B-HSF-GS08图片预览
型号: VBUS054B-HSF-GS08
PDF下载: 下载PDF文件 查看货源
内容描述: 4线总线端口的ESD保护 [4-Line BUS-port ESD-protection]
分类和应用:
文件页数/大小: 8 页 / 295 K
品牌: VISHAY [ VISHAY ]
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VBUS054B-HS3  
Vishay Semiconductors  
One mode of use is,…  
in the very first moment before any pulses have  
arrived, all three diodes are completely discharged  
(so the diode capacitances are empty of charge) the  
first signal pulse with an amplitude > 0.5 V will drive  
D
1
ZD  
the upper PN-diode (D ) in a forward direction and  
I/O  
1
"sees" the empty capacitance of the Z-diode (ZD).  
Depending on the duration of this pulse and the pause  
to the next one the Z-diodes capacitance can be  
charged up so that the next pulse "sees" a lower  
capacitance. After some pulses the big Z-diode could  
be completely charged up so that the following pulses  
just see the small capacitance of both PN-diodes.  
For some application this can work perfectly.....  
D
2
Gnd  
20405  
For others applications the capacitance must be the  
same all the time from the first till the last pulse.  
VBUS  
D
D
1
2
ZD  
For these applications the appropriate mode of use is  
to connect the Z-diode to the supply voltage.  
In this mode the Z-diode is charged up immediately by  
the supply voltage and both PN-diodes are always  
used in reverse. This keeps their capacitance at a  
minimum.  
I/O  
Gnd  
20406  
www.vishay.com  
6
Document Number 81586  
Rev. 1.4, 07-Oct-08  
For technical support, please contact: ESD-Protection@vishay.com