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參數(shù)資料
| 型號： | MAX6822LUK+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5 |
| 封裝： | LEAD FREE, SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 355K |
| 代理商： | MAX6822LUK+T |
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 10A 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 160A can flow into WDI.
Interfacing to Ps with
Bidirectional Reset Pins
Since the RESET output on the MAX6822 is open drain,
it interfaces easily with Ps that have bidirectional reset
pins, such as the Motorola 68HC11. Connecting the P
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 VCC Transients
These supervisors are relatively immune to short-dura-
tion, negative-going VCC transients (glitches), which
usually do not require the entire system to shut down.
MAX6821–MAX6825
Low-Voltage SOT23 P Supervisors with
Manual Reset and Watchdog Timer
6
_______________________________________________________________________________________
Figure 1. Functional Diagram
Figure 2. Reset Timing Diagram
VCC
1V
tRD
VTH
tRD
RESET
GND
RESET
tRP
MAX6821–
MAX6825
VCC
WDI
(MAX6821–MAX6824)
1.26V
GND
RESET
(MAX6821/MAX6824/ MAX6825)
RESET (MAX6822
–MAX6825)
MR
(MAX6821–MAX6823,
MAX6825)
RESET
GENERATOR
WATCHDOG
TIMER
WATCHDOG
TRANSITION
DETECTOR
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| MAX6822MUK+T | Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6822MUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 MICROPROCESSOR SU - Cut Tape Product |
| MAX6822MUK+ | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6822MUK+, SUPERVISORS - Tape and Reel 制造商:Maxim 功能描述:Maxim MAX6822MUK+, Microprocessor Supervisory Circuit 4.38V Reset Threshold 1.8V/2.5V/3V/3.3V/5V 5-pin SOT23 |
| MAX6822MUK+T | 功能描述:監(jiān)控電路 Single 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 |
| MAX6822MUK-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 |
| MAX6822RUK | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 MICROPROCESSOR SUPERVISORS - Bulk 制造商:Rochester Electronics LLC 功能描述: |
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