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參數(shù)資料
| 型號： | MAX6841HUKD1+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Ultra-Low-Voltage µP Reset Circuits and Voltage Detectors |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 214K |
| 代理商： | MAX6841HUKD1+T |
MAX6841–MAX6845
RESET IN decreases. The MAX6843/MAX6844/
MAX6845 assert a reset when the voltage at RESET IN
falls below the RESET IN threshold (VRSTIN). The low-
leakage current at RESET IN allows for relatively large-
value resistors to be used, which reduces power
consumption. For example, for VCC-TH = 0.9V, if R2 =
100k
, then R1 = 26.3k.
Applications Information
VCC Falling Transients
The MAX6841–MAX6845 are relatively immune to short-
duration falling VCC transients (glitches). Figure 2
shows typical transient duration vs. reset comparator
overdrive, for which the MAX6841–MAX6845 do not
generate a reset pulse. The graph was generated using
a falling pulse applied to VCC, starting 0.1V above the
actual reset threshold and ending below it by the mag-
nitude indicated (reset comparator overdrive). The
graph indicates the maximum pulse width that a falling
VCC transient can have without causing a reset pulse.
As the magnitude of the transient increases (goes fur-
ther below the reset threshold), the maximum allowable
pulse width decreases. A 0.1F bypass capacitor
mounted as close as possible to the VCC pin provides
additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC = 0
When VCC falls below 0.55V, the MAX6841/MAX6843
push-pull RESET output no longer sinks current; it
becomes an open circuit. Therefore, high-impedance
CMOS-logic inputs connected to RESET can drift to
undetermined voltages. This presents no problem in
most applications, because most P and other circuitry
are inoperative with VCC lower than 0.55V. However, in
applications in which RESET must be valid down to 0,
adding a pulldown resistor to RESET causes any stray
leakage currents to flow to ground, holding RESET low
(Figure 3). R3’s value is not critical; 200k
is large
enough not to load RESET and small enough to pull
RESET to ground.
A 200k
pullup resistor to VCC is also recommended
for the MAX6841/MAX6842/MAX6844 if push-pull
RESET is required to remain valid for VCC
≤ 0.75V.
Interfacing to Ps with Bidirectional
Reset Pins
Because the RESET output on the MAX6842/MAX6845
is open drain, these devices interface easily with Ps
that have bidirectional reset pins. Connecting the P
supervisor’s RESET output directly to the P’s RESET
pin with a single pullup resistor allows either device to
assert reset (Figure 4).
Ultra-Low-Voltage P Reset Circuits and
Voltage Detectors
6
_______________________________________________________________________________________
MAXIMUM TRANSIENT DURATION
vs. OVERDRIVE
OVERDRIVE VTH - VCC (mV)
MAXIMUM
TRANSIENT
DURATION
(
s)
10
150
200
250
300
350
400
450
500
550
600
100
1
100
RESET OCCURS ABOVE THIS LINE
Figure 2. Maximum Transient Duration vs. Overdrive
MAX6841
MAX6843
VCC
RESET
GND
R3
Figure 3. RESET Valid to VCC = 0
MAX6842
MAX6845
VCC
RESET
GND
VCC
RESET
INPUT
GND
P
Figure 4. Interfacing to Microprocessors with Bidirectional
Reset I/0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6841HUKD2 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6841HUKD2+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.313V 8.1UA 5PIN SOT-23 - Rail/Tube |
| MAX6841HUKD2+T | 功能描述:監(jiān)控電路 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(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(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 |
| MAX6841HUKD2-T | 功能描述:監(jiān)控電路 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(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(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 |
| MAX6841HUKD3 | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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