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微处理器监控电路,窗式(最小/最大)看门狗定时及手动复位

业内首款µP监控电路,具有窗式看门狗定时器和手动复位

产品详情

主要特征

应用/用途

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input/Output (WDI/WDO)
Windowed
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
ICC (µA) (max) 45
Package/Pins SOT23/6
Budgetary
Price (See Notes)
2.18
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简化框图

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参量

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input/Output (WDI/WDO)
Windowed
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
ICC (µA) (max) 45
Package/Pins SOT23/6
Budgetary
Price (See Notes)
2.18

主要特征

  • Min/Max (Windowed) Watchdog, 8 Factory-Trimmed Timing Options
  • Pulsed Open-Drain, Active-Low Watchdog Output
  • Power-On Reset
  • Precision Monitoring of +2.5V, +3.0V, +3.3V, and +5.0V Power Supplies
  • Open-Drain or Push-Pull Active-Low RESET Outputs
  • Low-Power Operation (23µA typ)
  • Debounced Manual Reset Input
  • Guaranteed Reset Valid to VCC = +1.2V
  • AEC-Q100 Qualified MAX6324HUT44/V+T

应用/用途

  • 汽车
  • 嵌入式控制系统
  • 工业
  • 医疗

描述

The MAX6323/MAX6324 microprocessor (µP) supervisory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity outside an expected window of operation. Six laser-trimmed reset thresholds are available with ±2.5% accuracy from +2.32V to +4.63V. Valid active-low RESET output is guaranteed down to VCC = +1.2V.

The active-low RESET output is either push-pull (MAX6323) or open-drain (MAX6324). active-low RESET is asserted low when VCC falls below the reset threshold, or when the manual reset input (active-low MR) is asserted low. active-low RESET remains asserted for at least 100ms after VCC rises above the reset threshold and active-low MR is deasserted.

The watchdog pulse output (active-low WDPO) utilizes an open-drain configuration. It can be triggered either by a fast timeout fault (watchdog input pulses are too close to each other) or a slow timeout fault (no watchdog input pulse is observed within the timeout period). The watchdog timeout is measured from the last falling edge of watchdog input (WDI) with a minimum pulse width of 300ns. Active-low WDPO is asserted for 1ms when a fault is observed. Eight laser-trimmed timeout periods are available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23 package and operate over the extended temperature range (-40°C to +125°C).

简化框图

MAX6323、MAX6324:典型工作电路 MAX6323、MAX6324:典型工作电路 Zoom icon

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在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心