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參數(shù)資料
| 型號(hào)： | MIC2777-XXBM5 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Dual Micro-Power Low Voltage Supervisor Advance Information |
| 中文描述： | 雙路微功率低電壓監(jiān)控進(jìn)展信息 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 375K |
| 代理商： | MIC2777-XXBM5 |
September 29, 2000
5
MIC2777
MIC2777
Micrel
Functional Diagram
GND
V
DD
IN
MIC2777
V
REF
V
REF
RST
R
S
Q
/Q
/RST
Delay
Line
One Shot
Functional Description
IN, Under-Voltage Detector Input
The voltage present at the IN pin is compared to the internal
300mV reference voltage. A reset is triggered if and when V
IN
falls below V
REF
. Typically, a resistor divider is used to scale
the input voltage to be monitored such that V
IN
will fall below
V
REF
as the voltage being monitored falls below the desired
trip-point. Hysteresis is employed to prevent chattering due to
noise. The comparator on the IN input is relatively immune to
very brief negative-going transients.
V
DD
Input
The V
DD
pin is both the power supply terminal and a moni-
tored input voltage. The voltage at this pin is continually
compared against the internal reference. The trip-point at
which a reset occurs is factory programmed. A reset is
triggered if and when V
DD
falls below the trip-point. Hyster-
esis is employed to prevent chattering due to noise. The
comparator on the V
DD
input is relatively immune to very brief
negative-going transients.
RST, /RST Reset Output
Typically, the MIC2777 is used to monitor the power supplies
of intelligent circuits such as microcontrollers and micropro-
cessors. By connecting the appropriate reset output of a
MIC2777 to the reset input of a
μ
C or
μ
P, the processor will
be properly reset at power-on and during power-down and
brown-out conditions.
The reset outputs are asserted any time V
DD
or V
IN
drops
below the corresponding threshold voltage. The reset out-
puts remain asserted for t
RST
(min) after V
IN
and/or V
DD
subsequent return above the threshold boundaries and/or
/MR is released. A reset pulse is also generated at power-on.
Manual Reset
The ability to initiate a reset via external logic or a manual
switch is provided in addition to the MIC2777
’
s automatic
supervisory functions. Typically, a momentary push-button
switch is connected such that IN is shorted to ground when
the switch contacts close. Assuming V
DD
and V
IN
are within
tolerance when the switch is released, the reset outputs will
be de-asserted no less than 140ms later. IN can also be
driven by an open-drain or open-collector logic signal.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2778-1BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2778-1BM5 TR | 功能描述:IC SUPERVISOR ADJ HYSTER SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC2778-1YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2778-1YM5 TR | 功能描述:監(jiān)控電路 V-Supervisor w/Adj. Hysteresis, Open-Drain Ouput, 1% Accuracy (Lead Free) RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MIC2778-1YM5-TR | 功能描述:Supervisor Open Drain or Open Collector 1 Channel SOT-23-5 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 受監(jiān)控電壓數(shù):1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 140 ms 電壓 - 閾值:可調(diào)節(jié)/可選擇 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
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