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| 型号： | CM1231-02SO |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | DIODE ESD CLAMP 2CH SOT23-6 |
| 标准包装： | 3,000 |
| 电极标记： | 2 通道阵列 - 双向 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | CM1231-02SO-ND CM1231-02SOOSTR |
CM1231 ? 02SO
ESD Strike
1 W
ESD
ESD
I/O Connector
I SHUNT1
Protection
Stage 1
I SHUNT2
Protection
Stage 2
I RESIDUAL
ASIC
Figure 2. Dual Clamp ESD Protection Block Diagram
CM1231 ? 02SO ARCHITECTURE OVERVIEW
The PicoGuard XP t two ? stage per channel matched
clamp architecture with isolated clamp rails features a series
element to radically reduce the residual ESD current (I RES )
that enters the ASIC under protection (see Figure 3). From
stage 1 to stage 2, the signal lines go through matched dual
1 W resistors.
The function of the series element (dual 1 W resistors for
the CM1231 ? 02SO) is to optimize the operation of the stage
two diodes to reduce the final I RES current to a minimum
while maintaining an acceptable insertion impedance that is
negligible for the associated signaling levels.
Each stage consists of a traditional low ? cap Dual Rail
Clamp structure which steer the positive or negative ESD
current pulse to either the positive (V P ) or negative (V N )
supply rail.
A zener diode is embedded between V P and V N , offering
two advantages. First, it protects the V CC rail against ESD
strikes. Second, it eliminates the need for an additional
bypass capacitor to shunt the positive ESD strikes to ground.
The CM1231 ? 02SO therefore replaces as many as seven
discrete components, while taking advantage of precision
internal component matching for improved signal integrity,
which is not otherwise possible with discrete components at
the system level.
V P
V N
I ESD
Positive Supply Rail
1 W
I RESIDUAL
Ground Rail
V CC
Circuitry
Under
Protection
Figure 3. CM1231 ? 02SO Block Diagram (I ESD Flow During a Positive Strike)
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