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微处理器监控电路

工业标准、功能完备的µP监控电路

产品详情

主要特征

应用/用途

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Adjustable Reset Input
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 300
Package/Pins CDIP/16
PDIP/16
SOIC (W)/16
Budgetary
Price (See Notes)
5.96
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简化框图

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参量

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Adjustable Reset Input
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 300
Package/Pins CDIP/16
PDIP/16
SOIC (W)/16
Budgetary
Price (See Notes)
5.96

主要特征

  • Adjustable Low-Line Monitor and Power-Down Reset
  • Power-OK/Reset Time Delay
  • Watchdog Timer—100ms, 1.6s, or Adjustable
  • Minimum Component Count
  • 1µA Standby Current
  • Battery-Backup Power Switching (MAX696)
  • On-Board Gating of Chip-Enable Signals (MAX697)
  • Separate Monitor for Power-Fail or Low-Battery Warning

应用/用途

  • 计算机
  • 控制器
  • 精确的µP电源监控
  • 智能仪表

描述

The MAX696/MAX697 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX696/MAX697 significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components.

The MAX696 and MAX697 are supplied in 16-pin packages and perform six functions:
  1. A reset output during power-up, power-down, and brownout conditions. The threshold for this "lowline" reset is adjustable by an external voltage-divider.
  2. A reset pulse if the optional watchdog timer has not been toggled within a specified time.
  3. Individual outputs for low-line and watchdog fault conditions.
  4. The reset time may be left at its default value of 50ms, or may be varied with an external capacitor or clock pulses.
  5. A separate 1.3V threshold detector for power-fail warning, low-battery detection, or to monitor a power supply other than VCC.
The MAX696 also has battery-backup switching for CMOS RAM, CMOS microprocessor, or other low-power logic.

The MAX697 lacks battery-backup switching, but has write-protection pins (active-low CE IN and active-low CE OUT) for CMOS RAM or EPROM. In addition, it consumes less than 250 microamperes.

简化框图

MAX696、MAX697:原理框图 MAX696、MAX697:原理框图 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

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