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參數(shù)資料
| 型號(hào)： | MIC811 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 復(fù)位半導(dǎo)體 |
| 英文描述： | Microprocessor Reset Circuit(微處理器復(fù)位電路（監(jiān)視基于微處理器系統(tǒng)的電源）) |
| 中文描述： | 微處理器復(fù)位電路（微處理器復(fù)位電路（監(jiān)視基于微處理器系統(tǒng)的電源）） |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | MIC811 |
Microprocessor Reset
The RESET pin is asserted whenever VCC falls below
the reset threshold voltage or if MR (manual reset) is
forced low. The reset pin remains asserted for a period
of 240ms after VCChas risen above the reset threshold
voltage or MR has returned high. The reset function
ensures the microprocessor is properly reset and powers
up into a known condition after a power failure. RESET
will remain valid with VCCas low as 1.4V.
VCCTransients
The MIC811/MIC812 are relatively immune to negative-
going VCCglitches below the reset threshold. Typically,
a negative-going transient 125mV below the reset
threshold with a duration of 50
μ
s (25
μ
s for
MIC81_R/S/T) or less will not cause an unwanted reset.
Interfacing to Bidirectional Reset Pins
The MIC811/MIC812 can interface with
μ
Ps with
bidirectional reset pins by connecting a 4.7K
resistor in
series with the MIC811/MIC812 output and the
μ
P reset
pin.
RESET Valid to 0V
A resistor can be added from the RESET pin to ground
to ensure the RESET output remains low with VCC
down to 0V. A 100K
resistor connected from RESET
to ground is recommended. The size of the resistor
should be large enough to not load the RESET output
and small enough to pull-down any stray leakage
currents.
Circuit Description
Figure 2. Reset Timing Diagram
Figure 3. RESET Valid to VCC= 0V.
VCC
MR
RESET
t1
t1
Vthr
MIC811/MIC812 Microprocessor Reset Circuits
5
VCC
RESET
μP
RESET
VCC
MIC811
VCC
100K
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| MIC811_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Microprocessor Reset Circuits |
| MIC811_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Microprocessor Reset Circuits |
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| MIC8114 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Microprocessor Reset Circuit |
| MIC8114_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Microprocessor Reset Circuit |
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