| 系统管理器件：MAX705CPA 低成本微处理器监控电路 |
| 来源: 时间: 2007-4-18 18:04:30 |
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概述
MAX705CPA 低成本微处理器监控电路 |
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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:
1) A reset output during power-up, power-down, and brownout conditions.
2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.
3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V.
4) 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 RESET-bar.
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. |
| 关键特性 |
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应用 |
- µMAX Package: Smallest 8-Pin SO
- Guaranteed RESET-bar Valid at VCC = 1V
- Precision Supply-Voltage Monitor
- 4.65V in MAX705/MAX707/MAX813L
- 4.40V in MAX706/MAX708
- 200ms Reset Pulse Width
- Debounced TTL/CMOS-Compatible Manual-Reset Input
- Independent Watchdog Timer-1.6sec Timeout (MAX705/MAX706)
- Active-High Reset Output (MAX707/MAX708/MAX813L)
- Voltage Monitor for Power-Fail or Low-Battery Warning
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主要参数, |
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| Key Specifications: Microprocessor Supervisors |
| Part Number |
Number of Monitored Voltages |
Reset Threshold Range (V) |
Active-Low Reset Output |
Active-High Reset Output |
Min. Reset Timeout Range |
Watchdog Feature |
Nom. Watchdog Timeout Range |
Supervisor Features |
Reset Thresh. Acc. (% at +25°C) |
Max. ICC (µA) |
Package |
Package Type |
Operating Temp. Range (°C) |
| MAX705 |
1 2 |
3.3 to 5.5 |
Push-Pull |
- |
85ms to 300ms |
Input (WDI)
Input/Output (WDI/WDO) |
1s to 2s |
Adjustable Reset Input Manual Reset Power Fail Comparator/Low Line |
2.5 |
350.0 |
8/PDIP
8/SOIC
8/uMAX |
µMAX Plastic DIP SOIC |
-40 to +125 -40 to +85 -55 to +125 0 to +70 |
| MAX706 |
Push-Pull |
- |
Input (WDI)
Input/Output (WDI/WDO) |
1s to 2s |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX707 |
Push-Pull |
Push-Pull |
No Watchdog |
- |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX708 |
Push-Pull |
Push-Pull |
No Watchdog |
- |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX813 |
- |
Push-Pull |
Input/Output (WDI/WDO) |
1s to 2s |
1.5 |
See Data Sheet |
| 注释 |
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Watchdog timer (MAX705,706,813) |
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Power-fail comparator (MAX705-8, 813) | |
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| 图表 |
Typical Operating Circuit 典型电路 |
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相关信息 |
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 | MAX705微处理器监控电路 | | | MAX705/ MAX706/ MAX707/ MAX708微处理器监控电路在上电、掉电或电源不稳定时产生一个低电平复位信号输出、复位脉冲宽度200ms，VCC=1V时，保证/RESET有效；当Watchdog输入在1.6s内未能触发时，将产生低电平有效的Watchdog输出信号；1.25V门限监测器用于掉电警告、低电池检测和监视+5V以外的电源；消抖动的TTL/CMOS兼容的低电平的手动复位输入；MAX707/708除了用一个高电平有效的复位信号...
>>详细内容 | | MAX705/ MAX706/ MAX707/ MAX708微处理器监控电路 | | | MAX705 / MAX706/ MAX707/ MAX708微处理器监控电路在上电、掉电或电源不稳定时产生一个低电平复位信号输出、复位脉冲宽度200ms，VCC=1V时，保证/RESET有效；当Watchdog输入在1.6s内未能触发时，将产生低电平有效的Watchdog输出信号；1.25V门限监测器用于掉电警告、低电池检测和监视+5V以外的电源；消抖动的TTL/CMOS兼容的低电平的手动复位输入；MAX707/708除了用一个高电平有效的复位信号...
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