- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385546 > MAX6814 (Maxim Integrated Products, Inc.) 5-Pin Watchdog Timer Circuit PDF資料下載
參數(shù)資料
| 型號： | MAX6814 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5-Pin Watchdog Timer Circuit |
| 中文描述： | 5引腳、看門狗定時器電路 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 631K |
| 代理商： | MAX6814 |
M
5-Pin Watchdog Timer Circuit
4
_______________________________________________________________________________________
MAX6814
V
CC
WDI
GND
WDO
WDO PULSE
GENERATOR
WATCHDOG
TIMER
WATCHDOG
TRANSITION
DETECTOR
UVLO
Figure 1. Functional Diagram
_______________Detailed Description
Watchdog Input
In the MAX6814, the watchdog circuit monitors the μP’s
activity. If the μP does not toggle the watchdog input
(WDI) within t
WD
(1.6s),
WDO
asserts. The internal 1.6s
timer is cleared by either a
WDO
pulse or by toggling
WDI, which detects pulses as short as 50ns. While
WDO
is asserted, the timer remains cleared and does
not count. As soon as
WDO
is released, the timer starts
counting (Figure 3).
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 MAX6814 WDI inputs are internally driven through
a buffer and series resistor from the watchdog counter
(Figure 1). When WDI is left unconnected, the watch-
dog timer is serviced within the watchdog timeout peri-
od 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 clear the watchdog timer. If WDI is externally driven
high for the majority of the timeout period, up to 160μA
can flow into WDI.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6814XK-T | 5-Pin Watchdog Timer Circuit |
| MAX6816EUS | PLASTIC ENCAPSULATED DEVICES |
| MAX6816 | 8-Bit Binary Counters With Input Registers 16-CDIP -55 to 125 |
| MAX6816EUS-T | 【15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers |
| MAX6817 | 【15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6814EVKIT# | 制造商:Maxim Integrated Products 功能描述:EVKIT FOR 5-PIN WATCHDOG TIMER CIRCUIT - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:EVAL KIT FOR MAX6814 |
| MAX6814XK | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6814XK, SUPERVISORS - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:5-PIN WATCHDOG TIMER CIRCUIT - Rail/Tube 制造商:Maxim 功能描述:Maxim MAX6814XK, Watchdog Timer Circuit 2.25V-5.5V 5-pin SC70 |
| MAX6814XK+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 10UA - Rail/Tube |
| MAX6814XK+T | 功能描述:監(jiān)控電路 5-Pin Watchdog Timer Circuit 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6814XK-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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。