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參數(shù)資料
| 型號(hào)： | MAX6825 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Voltage SOT23 レP Supervisors with Manual Reset and Watchdog Timer |
| 中文描述： | 低電壓、SOT23封裝、微處理器監(jiān)控電路，帶有手動(dòng)復(fù)位及看門(mén)狗定時(shí)器 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 167K |
| 代理商： | MAX6825 |
Disable the watchdog function by leaving WDI uncon-
nected or by three-stating the driver connected to WDI.
The watchdog input is internally driven low during the
first 7/8 of the watchdog timeout period and high for the
last 1/8 of the watchdog timeout period. When WDI is left
unconnected, this internal driver clears the 1.6s timer
every 1.4s. When WDI is three-stated or unconnected,
the maximum allowable leakage current is 10μA and the
maximum allowable load capacitance is 200pF.
Applications Information
Watchdog Input Current
The MAX6821/MAX6822/MAX6823/MAX6824 WDI inputs
are internally driven through a buffer and series resistor
from the watchdog timer (
Figure 1). When WDI is left
unconnected, the watchdog timer is serviced within the
watchdog timeout period by a low-high-low pulse from
the counter chain. For minimum watchdog input current
(minimum overall power consumption), leave WDI low for
the majority of the watchdog timeout period, pulsing it
low-high-low once within the first 7/8 of the watchdog
timeout period to reset the watchdog timer. If WDI is
externally driven high for the majority of the timeout peri-
od, up to 160μA can flow into WDI.
Interfacing to μPs with
Bidirectional Reset Pins
Since the
RESET
output on the MAX6822 is open drain,
it interfaces easily with μPs that have bidirectional reset
pins, such as the Motorola 68HC11. Connecting the μP
supervisor
’
s
RESET
output directly to the microcon-
troller
’
s
RESET
pin with a single pullup resistor allows
either device to assert reset (see Figure 4).
Negative-Going V
CC
Transients
These supervisors are relatively immune to short-dura-
tion, negative-going V
CC
transients (glitches), which
usually do not require the entire system to shut down.
M
Low-Voltage SOT23 μP Supervisors with
Manual Reset and Watchdog Timer
6
_______________________________________________________________________________________
Figure 1. Functional Diagram
Figure 2. Reset Timing Diagram
V
CC
1V
1V
t
RD
V
TH
V
TH
t
RD
RESET
GND
RESET
t
RP
t
RP
MAX6821–
MAX6825
V
CC
V
CC
WDI
(MAX6821
–
MAX6824)
1.26V
GND
RESET
(MAX6821/MAX6824
/
MAX6825)
RESET (MAX6822
–
MAX6825)
MR
(MAX6821/MAX6822/MAX6823,
MAX6825)
RESET
GENERATOR
WATCHDOG
TIMER
WATCHDOG
TRANSITION
DETECTOR
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6825LUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 UP SUPERVISOR WIT - Rail/Tube |
| MAX6825LUK+ | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6825LUK+, SUPERVISORS - Tape and Reel 制造商:Maxim 功能描述:Maxim MAX6825LUK+, Microprocessor Supervisory Circuit 4.63V Reset Threshold 1.8V/2.5V/3V/3.3V/5V 5-pin SOT23 |
| MAX6825LUK+T | 功能描述:監(jiān)控電路 Single 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 |
| MAX6825LUK-T | 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 |
| MAX6825MUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 UP SUPERVISOR WIT - Rail/Tube |
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