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參數(shù)資料
| 型號(hào)： | MAX820SCPE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply Supervisor |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 272K |
| 代理商： | MAX820SCPE |
M
Microprocessor and Nonvolatile
Memory Supervisory Circuits
______________________________________________________________________________________
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 typi-
cally 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 saturation
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 typically
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.
Watchdog Function
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 timeout period (1.6s
nominal),
WDPO
and
WDO
are asserted, indicating a soft-
ware fault condition (see
Watchdog-Pulse Output
and
Watchdog Output
sections).
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
LOW LINE
= 1.3 R1 + R2
R2
)
V
RESET
= 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX820SCPE+ | 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820SCSE | 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 |
| MAX820SCSE+ | 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820SCSE+T | 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820SCSE-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 |
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