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參數(shù)資料
| 型號： | 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)控進展信息 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 375K |
| 代理商： | MIC2777-XXBM5 |
September 29, 2000
7
MIC2777
MIC2777
Application Information
Micrel
IN
/RST
RST
VDD
GND
MIC2777-23
R1
676k
1%
R2
324k
1%
/RESET
VCORE
VI/O
GND
V
CORE
1.0V
5%
MICROPROCESSOR
V
I/O
2.5V
±
5%
Figure 1. MIC2777 Example Design
Transient response
The MIC2777 is inherently immune to very short negative-
going
“
glitches.
”
Very brief transients may exceed the voltage
thresholds without tripping the output.
As shown in Figure 3a and 3b, in general the narrower the
transient, the deeper the threshold overdrive that will be
ignored by the MIC2777. The graph represents the typical
allowable transient duration for a given amount of threshold
overdrive that will not generate a reset.
0
5
10
15
20
25
30
35
40
0
100
200
300
M
μ
s
RESET COMP. OVERDRIVE, V
REF
–
V
IN
(mV)
Figure 3a. Typical INPUT Transient Response
Typical INPUT
Transient Response
0
20
40
60
80
100
0
500
1000
1500
2000
M
μ
s
RESET COMP. OVERDRIVE, V
REF
–
V
DD
(mV)
Typical V
DD
Transient Response
Figure 3b. Typical V
DD
Transient Response
Ensuring Proper Operation at Low Supply
At levels of V
DD
below 1.2V, the MIC2777
’
s /RST output
cannot turn on sufficiently to produce a valid logic-low on
/RST. In this situation, other circuits driven by /RST could be
allowed to float, causing undesired operation. (In most cases,
however, it is expected that the circuits driven by the MIC2777
will be similarly inoperative at V
DD
≤
1.2V.)
If a given application requires that /RST be valid below V
DD
= 1.2V, this can be accomplished by adding a pull-down
resistor to the /RST output. A value of 100k
is recom-
mended as this is usually an acceptable compromise of
quiescent current and pull-down current. The resistor
’
s value
is not critical, however. See Figure 4.
The statements above also apply to the MIC2777
’
s RST
output. That is, to ensure valid RST signal levels at V
DD
<
1.2V, a pull-up resistor (as opposed to a pull-down) should be
added to the RST output. A value of 100k
is typical for this
application as well. See Figure 5.
IN
/RST
RST
VDD
GND
MIC2777-XX
R1
R2
/RESET
VCC
GND
V
CC
MICROPROCESSOR
100k
Rpull-down
Figure 4. MIC2777 Valid /RST Below 1.2V
IN
RST
/RST
VDD
GND
MIC2777-XX
R1
R2
RESET
VCC
GND
V
CC
MICROPROCESSOR
100k
Rpull-up
Figure 5. MIC2777 Valid RST Below 1.2V
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相關代理商/技術參數(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 |
| 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 |
| 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:簡單復位/加電復位 受監(jiān)控電壓數(shù):1 輸出:開路漏極或開路集電極 復位:低有效 復位超時: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 供應商器件封裝:SOT-23-5 標準包裝:1 |
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