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參數(shù)資料
| 型號(hào)： | MAX801MMJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Interface IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, CDIP8 |
| 封裝： | 0.300 INCH, CERDIP-8 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | MAX801MMJA |
calculate the amount of capacitance required to allow
the shutdown routine to complete before reset is
asserted:
C
HOLD
= (I
LOAD
x t
SHDN
) / (V
LR(min)
)
where t
SHDN
is the time required for the system to com-
plete the shutdown routine (including the V
CC
to low-
line propagation delay), I
LOAD
is the current being
drained from the capacitor, and V
LR
is the low-line to
reset threshold.
Output S upply V oltage
The output supply (OUT) transfers power from V
CC
or
BATT to the μP, RAM, and other external circuitry. At
the maximum source current of 250mA, V
OUT
will typi-
cally be 220mV below V
CC
. Decouple OUT with a 0.1μF
capacitor to ground.
Battery-Bac kup Mode
Battery-backup mode preserves the contents of RAM in
the event of a brownout or power failure. With a backup
battery installed at BATT, the MAX801/MAX808 automati-
cally switches RAM to backup power when V
CC
falls.
Two conditions are required for switchover to battery-
backup mode: 1) V
CC
must be below the reset threshold;
2) V
CC
must be below V
BATT
. Table 1 lists the status of
inputs and outputs during battery-backup mode.
BATT is designed to conduct up to 20mA to OUT dur-
ing battery backup. The PMOS switch on-resistance is
approximately 12
. Figure 4 shows the two series pass
elements (between the BATT input and OUT) that
facilitate UL recognition. V
BATT
can exceed V
CC
during
normal operation without causing a reset.
M
8-Pin μP S upervisory Circ uits
with ±1.5% Reset Ac c urac y
_______________________________________________________________________________________
9
GND
V
CC
TO
μ
P NMI
C
HOLD
C
HOLD
> I
LOAD
x t
SHDN
V
LR
4.5V to 5.5V
LOWLINE
MAX801
MAX808
REGULATOR
Figure 3. Using LOWLINE to Provide a Power-Fail Warning to
the μP
MAX801
MAX808
P
P
P
OUT
V
CC
BATT
0.1
μ
F
CONTROL
CIRCUITRY
Figure 4. V
CC
and BATT to OUT Switch
RESET
Logic low
3
3
RESET
Logic high; the open-circuit
voltage is equal to V
CC
.
—
V
CC
PIN
5
GND
LOWLINE
Ground—0V reference for
all signals
4
4
WDI
WDI is ignored and goes
high impedance.
—
6
BATT
Supply current is 1μA max for
V
BATT
≤
2.8V.
7
7
CE
IN
CE
OUT
High impedance (MAX808)
6
—
Logic high. The open-circuit
output voltage is equal to
V
BATT
(MAX808).
5
—
OUT
OUT is connected to BATT
through two internal PMOS
switches in series.
NAME
8
8
Battery switchover
comparator monitors V
CC
for active switchover.
1
1
Logic low
2
2
MAX801 MAX808
STATUS
Table 1. Input and Output Status in
Battery-Backup Mode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX801N | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Dual Universal Switched Capacitor Filter[MF10/MF10BJ/MF10BN/MF10BWP/MF10BWP-T/MF10CC/D/MF10CJ/MF10CN/MF10CWP/MF10CWP-T ] |
| MAX801NCPA | 功能描述:監(jiān)控電路 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(lèi)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 |
| MAX801NCPA+ | 功能描述:監(jiān)控電路 8-Pim uPower Supervisor 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(lèi)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 |
| MAX801NCSA | 功能描述:監(jiān)控電路 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(lèi)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 |
| MAX801NCSA+ | 功能描述:監(jiān)控電路 8-Pim uPower Supervisor 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(lèi)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 |
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