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| 型號： | MAX792R |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門限2.61V,微處理器和非易失存儲器監(jiān)控電路) |
| 中文描述： | 微處理器及非易失存儲器監(jiān)控電路 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 182K |
| 代理商： | MAX792R |
M
Mic roproc essor and Non-Volatile
Memory S upervisory Circ uits
______________________________________________________________________________________
11
Reset Outputs (RESET and
RESET
)
The
RESET
output is active low and typically sinks 1.6mA
at 0.1V. When deasserted,
RESET
sources 1.6mA at
typically V
CC
- 1.5V. The RESET output is the inverse of
RESET. RESET
is guaranteed to be valid down to V
CC
=
1V, and an external 10k
pull-down resistor on
RESET
ensures that it will be valid with V
CC
down to GND
(Figure 5). As V
CC
goes below 1V, the gate drive to the
RESET
output switch reduces accordingly, increasing
the r
DS(ON)
and the saturation voltage. The 10k
pull-
down resistor ensures that the parallel combination of
switch plus resistor will be around 10k
and the satura-
tion voltage will be below 0.4V while sinking 40μA.
When using an external pull-down resistor of 10k
, the
high state for the
RESET
output with V
CC
= 4.75V is typi-
cally 4.60V.
Overvoltage Comparator
The overvoltage comparator is an uncommitted com-
parator that has no effect on the operation of other chip
functions. Use this input to provide overvoltage indica-
tion by connecting a voltage divider from the input sup-
ply, as in Figure 6.
Connect OVI to ground if the overvoltage function is not
used.
OVO
goes low when OVI goes above 1.30V. With
OVI below 1.30V,
OVO
is actively pulled to V
CC
and can
source1μA.
Watc hdog Func tion
The watchdog monitors μP activity via the watchdog
input (WDI). If the μP becomes inactive,
WDO
and
WDPO
are asserted. To use the watchdog function,
connect WDI to a μP bus line or I/O line. If WDI
remains high or low for longer than the watchdog time-
out period (1.6sec nominal),
WDPO
and
WDO
are assert-
ed, indicating a software fault condition (see
Watchdog-Pulse Output and Watchdog Output sec-
tions).
Watchdog Input
If the watchdog function is unused, connect WDI to V
CC
or GND. A change of state (high-to-low, low-to-high, or
a minimum 100ns pulse) at WDI during the watchdog
period resets the watchdog timer. The watchdog timer
MAX792
MAX820
GND
V
CC
REGULATOR
R1
R2
R3
R4
TO
μ
P
TO
μ
P
TO
μ
P NMI
2
1
10
RESET IN/INT
LLIN/REFOUT
RESET
RESET
LOW LINE
V
= 1.3 R1 + R2
R2
)
V
= 1.3 R3 + R4
R4
)
Figure 4c. Alternative connection for external programming mode
RESET
MAX792
MAX820
TO
μ
P RESET
1
10k
Figure 5. Adding an external pull-down resistor ensures
RESET
is valid with V
CC
down to GND.
MAX792
MAX820
6
7
12
GND
3
V
CC
OVI
OVO
OVERVOLTAGE
VOLTAGE REGULATOR
1.30V
Figure 6. Detecting an Overvoltage Condition
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX792S | Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門限1.91V,微處理器和非易失存儲器監(jiān)控電路) |
| MAX792T | Microprocessor and Non-Volatile Memory Supervisory Circuits(復(fù)位門限3.06V,微處理器和非易失存儲器監(jiān)控電路) |
| MAX793 | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有監(jiān)控器、芯片使能和支持備用電池的復(fù)位器) |
| MAX794 | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有可調(diào)閾值監(jiān)控器、芯片使能和支持備用電池的復(fù)位器) |
| MAX796 | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX792RC/D | 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX792RCPE | 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX792RCPE+ | 功能描述:監(jiān)控電路 MPU & NV Memory Supervisor 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX792RCSE | 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX792RCSE+ | 功能描述:監(jiān)控電路 MPU & NV Memory Supervisor 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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