The MAX705–MAX708/MAX813L microprocessor (μP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in μP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
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A reset output during power-up, power-down, and brownout conditions.
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An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.
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A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V.
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An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of active-low RESET.
Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and μMAX
? packages.
關(guān)鍵特性
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Available in Tiny μMAX Package
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Guaranteed RESET Valid at VCC = 1V
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Precision Supply-Voltage Monitor
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4.65V in MAX705/MAX707/MAX813L
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4.40V in MAX706/MAX708
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200ms Reset Pulse Width
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Debounced TTL/CMOS-Compatible Manual-Reset Input
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Independent Watchdog Timer—1.6s Timeout (MAX705/MAX706)
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Active-High Reset Output (MAX707/MAX708/MAX813L)
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Voltage Monitor for Power-Fail or Low-Battery Warning
應(yīng)用/使用
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汽車電子
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計(jì)算機(jī)：臺式機(jī)、工作站和服務(wù)器
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控制器
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精確的μP監(jiān)控
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智能儀表
