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| 型号： | MAX6814XK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | IC WATCHDOG TIMER CIRC SC70-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 监视器电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 1.12 s |
| 电压 - 阀值： | 2.19V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 其它名称： | MAX6814XK+TDKR |
5-Pin Watchdog Timer Circuit
V CC
WDO PULSE
MAX6814
UVLO
GENERATOR
WDO
WDI
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
GND
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.
4
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相关代理商/技术参数 |
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| 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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