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參數(shù)資料
| 型號： | MAX807_MJE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Featured レP Supervisory Circuit with 【1.5eset Accuracy |
| 中文描述： | 全功能レP監(jiān)控電路與精度【1.5eset |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 116K |
| 代理商： | MAX807_MJE |
M
Full-Featured μP S upervisory Circ uit with
±1.5% Reset Ac c urac y
______________________________________________________________________________________
11
(see the Chip-Enable Propagation Delay vs. CE OUT
Load Capacitance graph in the Typical Operating
Characteristics). The CE propagation delay is produc-
tion tested from the 50% point on CE IN to the 50%
point on CE OUT using a 50
driver and 50pF of load
capacitance (Figure 8). For minimum propagation
delay, minimize the capacitive load at CE OUT and use
a low output-impedance driver.
Chip-Enable Output
In the enabled mode, the impedance of CE OUT is equiv-
alent to 75
in series with the source driving CE IN. In the
disabled mode, the 75
transmission gate is off and CE
OUT is actively pulled to the higher of V
CC
or V
BATT
. This
source turns off when the transmission gate is enabled.
Low-Line Comparator
The low-line comparator monitors V
CC
with a threshold
voltage typically 52mV above the reset threshold, with
13mV of hysteresis. Use LOW LINE to provide a non-
maskable interrupt (NMI) to the μP when power begins
to fall, to initiate an orderly software shutdown routine.
In most battery-operated portable systems, reserve
energy in the battery provides ample time to complete
the shutdown routine once the low-line warning is
encountered, and before reset asserts. If the system
must contend with a more rapid V
CC
fall time—such as
when the main battery is disconnected, a DC-DC con-
verter shuts down, or a high-side switch is opened dur-
ing normal operation—use capacitance on the V
CC
line
to provide time to execute the shutdown routine (Figure
9). First calculate the worst-case time required for the
system to perform its shutdown routine. Then, with the
worst-case shutdown time, the worst-case load current,
and the minimum low-line to reset threshold (V
LR(min)
),
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, and includes the V
CC
to
low-line propagation delay; and where I
LOAD
is the cur-
rent being drained from the capacitor, V
LR
is the low-
line to reset threshold.
V
CE IN
RESET
THRESHOLD
CE OUT
RESET
RESET
26
μ
s
28
μ
s
26
μ
s
MAX807
CE IN
50pF
C
LOAD
CE OUT
GND
V
RST
MAX
50
DRIVER
V
CC
Figure 7. Reset and Chip-Enable Timing
Figure 8. CE Propagation Delay Test Circuit
GND
V
CC
TO
μ
P NMI
C
HOLD
C
HOLD
> I
LOAD
x t
SHDN
V
LR
4.5V to 5.5V
LOW LINE
MAX807
REGULATOR
Figure 9. Using LOW LINE to Provide a Power-Fail Warning to
the μP
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX807MMJE | 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 |
| MAX807N | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:5V.Isolated.RS-232 Driver Receiver[MAX250/MAX251/MAX250/MAX251/MAX250/MAX251/MAX250C/D/MAX250CPD/MAX250CSD/MAX250CSD-T/MAX250EJD/MAX250EPD/MAX250ESD/MAX250ESD-T/MAX251C/D/MAX251CPD/MAX251CSD/MAX251CSD-T/MAX251EJD/MAX251EPD/MAX251ESD/MAX251ESD-T] |
| MAX807NCPE | 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 |
| MAX807NCPE+ | 功能描述:監(jiān)控電路 Full-Featured uPower 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 |
| MAX807NCUE | 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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