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參數(shù)資料
| 型號： | MIC812_U |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 復位半導體 |
| 英文描述： | Microprocessor Reset Circuits |
| 中文描述： | 微處理器復位電路 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 159K |
| 代理商： | MIC812_U |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC812 | Microprocessor Reset Circuit(微處理器復位電路（監(jiān)視基于微處理器系統(tǒng)的電源）) |
| MIC820 | Teeny Ultra Low Power Op Amp |
| MIC820BC5 | Teeny Ultra Low Power Op Amp |
| MIC833 | 30000 SYSTEM GATE 3.3 VOLT LOGIC CELL AR - NOT RECOMMENDED for NEW DESIGN |
| MIC833BM5 | 30000 SYSTEM GATE 3.3 VOLT LOGIC CELL AR - NOT RECOMMENDED for NEW DESIGN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC820 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Teeny Ultra Low Power Op Amp |
| MIC820BC5 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Teeny Ultra Low Power Op Amp |
| MIC826 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Voltage Supervisor with Watchdog Timer,Manual Reset, and Dual Outputs In 1.6mm x 1.6mm TDFN |
| MIC826LYMT T5 | 制造商:Micrel Inc 功能描述:SUPERVISOR 制造商:Micrel Inc 功能描述:MIC826 Series Dual Output 5.5 V Voltage Supervisor Manual Reset/Watchdog -TDFN-6 制造商:Micrel Inc 功能描述:SUPERVISOR, Threshold Voltage:4.625V, No. of Supervisors / Monitors:1, Supply Voltage Min:1V, Supply Voltage Max:5.5V, Reset Type:Active-High, Active-Low, Digital IC Case Style:TDFN, No. of Pins:6, Supply Current:4.8A, Delay |
| MIC826LYMT TR | 功能描述:監(jiān)控電路 Voltage Supervisor Watchdog/Dual Output RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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