DS1814A

5V及3.3V MicroMonitor


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说明

The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature-compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize. The DS1814/DS1819 ‘A' and ‘C' perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 'A' and 'B' versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if the strobe input does not change state every 1.12 seconds. The watchdog timer function can be disabled by leaving the watchdog strobe input disconnected.
DS1814、DS1819:原理框图 DS1814、DS1819:原理框图 放大+

关键特性

  • Halts and restarts an out-of-control microprocessor
  • Holds microprocessor in check during power transients
  • Automatically restarts microprocessor after power failure
  • Monitors pushbutton for external override
  • Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring
  • Eliminates the need for discrete components
  • 20% tolerance for use with 3.0V systems
  • Pin- and function-compatible with the MAX823/24/25 products
  • Low cost SOT-23-5 package
  • Industrial temperature range: -40°C to +85°C
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1814A 3.3 to 5.5
Active Low
Push-Pull
85ms to 300msInput (WDI)1s to 2sManual Reset2.515
SOIC(N)/8
$0.72 @1k
DS1814B 3.3 to 5.5
Active High
Active Low
Push-Pull
Input (WDI)1s to 2s-15
SOIC(N)/8
$0.72 @1k
DS1814C 3.3 to 5.5
Active High
Active Low
Push-Pull
No Watchdog-Manual Reset15
SOIC(N)/8
$0.72 @1k
DS1819A 2.5 to 3.3
Active Low
Push-Pull
Input (WDI)1s to 2sManual Reset12
SOIC(N)/8
$2.17 @1k
DS1819B 2.5 to 3.3
Active High
Active Low
Push-Pull
Input (WDI)1s to 2s-12
SOIC(N)/8
$2.17 @1k
DS1819C 2.5 to 3.3
Active High
Active Low
Push-Pull
No Watchdog-Manual Reset12
SOIC(N)/8
$2.17 @1k
查看所有Supervisors (1 Monitored Voltage) (258)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

技术资料

应用笔记 164 Using the DS1814 MicroMonitor to Control Microprocessor Resets

质量和环境数据

申请可靠性报告: DS1814A 
无铅封装的锡(Sn)晶须报告
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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