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參數(shù)資料
| 型號： | SI8440 |
| 廠商： | Silicon Laboratories Inc. |
| 英文描述： | QUAD-CHANNEL DIGITAL ISOLATOR |
| 中文描述： | 四通道數(shù)字隔離 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大小： | 436K |
| 代理商： | SI8440 |
Si8440/1/2
16
Rev. 0.3
4. Layout Recommendations
Dielectric isolation is a set of specifications produced by
the safety regulatory agencies from around the world
that describes the physical construction of electrical
equipment that derives power from a high-voltage
power system such as 100–240 V
AC
systems or
industrial power systems. The dielectric test (or HIPOT
test) given in the safety specifications places a very high
voltage between the input power pins of a product and
the user circuits and the user touchable surfaces of the
product. For the IEC relating to products deriving their
power from the 220–240 V power grids, the test voltage
is 2500 V
AC
(or 3750 V
DC
—the peak equivalent
voltage).
There are two terms described in the safety
specifications:
Creepage—the distance along the insulating surface
an arc may travel.
Clearance—the distance through the shortest path
through air that an arc may travel.
Figure 14 illustrates the accepted method of providing
the proper creepage distance along the surface. For a
220–240 V application, this distance is 8 mm and the
wide body SOIC package must be used. There must be
no copper traces within this 8 mm exclusion area, and
the surface should have a conformal coating such as
solder resist. The digital isolator chip must straddle this
exclusion area.
Figure 14. Creepage Distance
4.1. Supply Bypass
The Si8440 requires a 0.1 μF bypass capacitor between
V
DD1
and GND1 and V
DD2
and GND2. The capacitor
should be placed as close as possible to the package.
4.2. Input and Output Characteristics
The Si8440 inputs and outputs are standard CMOS
drivers/receivers.
4.3. Enable Inputs
The receiver output drivers are enabled when the
Enable input is high and the drivers remain in a high-
impedance state when Enable is low. The Enable input
can be used for multiplexing or as a clock sync input.
Supply currents remain at their nominal values when
Enable is low. The Enable inputs must be tied to a logic
level.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI8440-A-IS | QUAD-CHANNEL DIGITAL ISOLATOR |
| SI8440-B-IS | QUAD-CHANNEL DIGITAL ISOLATOR |
| SI8440-C-IS | QUAD-CHANNEL DIGITAL ISOLATOR |
| SI8441 | QUAD-CHANNEL DIGITAL ISOLATOR |
| SI8441-A-IS | QUAD-CHANNEL DIGITAL ISOLATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI8440AA-C-IS1 | 功能描述:隔離器接口集成電路 QuadCh 1.0kV Isolatr 1M 4/0 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| Si8440AA-C-IS1R | 功能描述:隔離器接口集成電路 QuadCh 1.0kV Isolatr 1M 4/0 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| Si8440AA-D-IS1 | 功能描述:隔離器接口集成電路 QuadCh 1.0kV Isolatr 1M 4/0 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| SI8440AA-D-IS1R | 功能描述:隔離器接口集成電路 QuadCh 1.0kV Isolatr 1M 4/0 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| Si8440AB-C-IS | 功能描述:隔離器接口集成電路 Quad Ch 2.5kV Isolator 1M 4/0 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
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