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參數(shù)資料
| 型號(hào)： | CM1223-04ST |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | UNIDIRECTIONAL, SILICON, TVS DIODE, MO-178AB |
| 封裝： | MO-178, 6 PIN |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 573K |
| 代理商： | CM1223-04ST |
2008 California Micro Devices Corp. All rights reserved.
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
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Fax: 408.263.7846
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3
Issue B – 05/13/08
CM1223
Backdrive protection
Backdrive protection is needed to block against back-
drive current flowing from a high potential voltage node
toward a lower potential voltage node through the inter-
face cable.
For example, consider a DVD player connected to a TV
via an HDMI interface. If the DVD player is switched off
and the TV is left on, there is a possibility of reverse
current flow back into the main power supply rail of the
DVD player. Typically, the DVD's power supply has
some form of bulk supply capacitance associated with
it. Because all CMOS logic exhibits a very high imped-
ance on the power rail node when "off", if there is very
little parasitic shunt resistance and as little as a few mil-
liamps of "backdrive" current flowing back into the
power rail, it is possible over time to charge that bulk
supply capacitance to some intermediate level. If this
level rises above the power-on-reset (POR) voltage
level of some of the integrated circuits, the DVD player
may not reset properly when the DVD player is turned
back on.
To avoid this situation, the CM1223 with integrated
backdrive protection diode was designed to block back-
drive current, guaranteeing no more than 5μA on any I/
O pin when the I/O pin voltage is greater than the
CM1223 supply voltage.
Figure 1. Backdrive Protection Diagram.
One Channel
CM1223
Integrated Backdrive
Protection Diode
D1
D2
CBULK
+
“Off
IBACKDRIVE = 0
VDD_SINK
VDD_SOURCE
I/O
Discrete Backdrive
Protection Diode
D1
D2
CBULK
+
“Off
IBACKDRIVE = 0
VDD_SINK
VDD_SOURCE
I/O
One Channel
CM1213
HOST
ASIC
Peripheral
ASIC
HOST
ASIC
Peripheral
ASIC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CM1223-08MR | 功能描述:ESD 抑制器 8-Channel ESD Array Backdrive Protection RoHS:否 制造商:STMicroelectronics 通道:8 Channels 擊穿電壓:8 V 電容:45 pF 端接類型:SMD/SMT 封裝 / 箱體:uQFN-16 功率耗散 Pd: 工作溫度范圍:- 40 C to + 85 C |
| CM1223-08MS | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Industry First Low Capacitance ESD Protection Arrays w/Backdrive Protection |
| CM1223-SBX2LW-Z | 制造商:Fema Electronics Corporation 功能描述: |
| CM1223-SGT2LW-Z | 制造商:Fema Electronics Corporation 功能描述: |
| CM1224 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:2- and 4-Channel Low Capacitance ESD Protection Arrays |
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