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參數(shù)資料
| 型號： | MIC708T |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | μP Supervisory Circuit(μP監(jiān)控電路（帶電源故障警告和手動復位）) |
| 中文描述： | 微處理器監(jiān)控電路（微處理器監(jiān)控電路（帶電源故障警告和手動復位）） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 185K |
| 代理商： | MIC708T |
6
the WDI pin will reset the watchdog timer. The output of
the watchdog timer (WDO) will remain high if WDI sees
a valid transition within the watchdog timeout period. If
VCC falls below the reset threshold voltage then WDO
goes low immediately regardless of WDI. Likewise,
WDO goes high immediately after VCC exceeds the
reset threshold. WDO can be connected to MR to
generate a reset pulse upon watchdog timeout.
Microprocessor Reset
The RESET pin is asserted whenever VCC falls below
the reset threshold voltage or when MR goes low. The
reset pin remains asserted for a period of 200ms after
VCC has risen above the reset threshold voltage and
MR goes 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.
Power Fail Warning
An additional comparator which is independent of other
functions on the MIC706/MIC708 is provided for early
warning of power failure. An external voltage divider
can be used to compare unregulated DC to an internal
1.25V reference. The voltage divider ratio on the input
of the power fail comparator (PFI) can be chosen so as
to trip the power fail comparator a few milliseconds
before VCC falls below the maximum reset threshold
voltage. The output of the power fail comparator (PFO)
can be used to interrupt the microprocessor when used
in this mode and execute shut-down procedures prior to
power loss.
Watchdog Timer
The microprocessor can be monitored by connecting
the WDI pin (watchdog input) to a bus line or I/O line. If
a transition doesn’t occur on the WDI pin within the
watchdog timeout period, then WDO will go low. A
minimum pulse of 50ns (4.5V supply) or 100ns (2.7V
supply) or any transition low-to-high or high-to-low on
+
-
1.25V
R1
R2
Unregulated DC
PFO
PFI
Figure 3. Power Fail Comparator
Circuit Description
Figure 4. Reset Timing Diagram
VCC
MR
RESET
V
RT
t
MR
t
MD
t
RS
t
RS
WDO
MIC706P/R/S/T, MIC708R/S/T
μ
P Supervisory Circuits
相關PDF資料 |
PDF描述 |
|---|---|
| MIC706R | μP Supervisory Circuit(μP監(jiān)控電路（帶看門狗定時器，微處理器復位，電源故障警告和手動復位功能）) |
| MIC706T | μP Supervisory Circuit(μP監(jiān)控電路（帶看門狗定時器，微處理器復位，電源故障警告和手動復位功能）) |
| MIC708R | μP Supervisory Circuit(μP監(jiān)控電路（帶電源故障警告和手動復位）) |
| MIC708S | μP Supervisory Circuit(μP監(jiān)控電路（帶電源故障警告和手動復位）) |
| MIC7111 | 40000 SYSTEM GATE 3.3 VOLT LOGIC CELL AR - NOT RECOMMENDED for NEW DESIGN |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC708TM | 功能描述:IC SUPERVISOR 3.08V VTH 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:標準傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC708TM TR | 功能描述:IC SUPERVISOR MPU 3.08V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:標準傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC708TMY | 功能描述:監(jiān)控電路 P Supervisor, Pwr Fail Detect, 3.08V VTH, SOIC-08 (Lead Free) 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: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 |
| MIC708TMY TR | 功能描述:監(jiān)控電路 P Supervisor, Pwr Fail Detect, 3.08V VTH, SOIC-08 (Lead Free) 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: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 |
| MIC708TN | 功能描述:IC SUPERVISOR 3.08V VTH 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:標準傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
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