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参数资料
| 型号： | MAX6814XK+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | 5-Pin Watchdog Timer Circuit |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | SC-70, 5 PIN |
| 文件页数： | 4/6页 |
| 文件大小： | 631K |
| 代理商： | MAX6814XK+T |
MAX6814
5-Pin Watchdog Timer Circuit
4
_______________________________________________________________________________________
MAX6814
VCC
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 P’s
activity. If the P does not toggle the watchdog input
(WDI) within tWD (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 10A 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 160A
can flow into WDI.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6815LEUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815LEUS-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815MEUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815MEUS-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815REUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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