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Low-Cost, Power-On Reset and Watchdog Controllers

Product Details

Key Features

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
ICC (µA) (max) 5000
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
2.48
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
ICC (µA) (max) 5000
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
2.48

Key Features

  • Precision Voltage Monitor
  • Power-OK/Reset Time Delay
  • Watchdog Timer
  • Minimum Component Count

Applications/Uses

  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments

Description

The MAX698/MAX699 monitor the +5V supply in microprocessor (µP) and digital systems. They supply a active-low RESET pulse of at least 140ms duration on power-up, power-down, and during low-voltage brownout conditions. Circuit reliability is increased at reduced cost by eliminating all external components and adjustments.

The MAX699 includes all features of the MAX698, but also provides a watchdog input to monitor microprocessor activity. The active-low RESET output goes low if the watchdog input (WDI) is not toggled within 1 second. The watchdog feature can be disabled by leaving WDI open.

Both parts are supplied in 8-lead PDIP and 16-lead 0.3in wide small outline (SO) packages and are specified from 0°C to +70°C for C grade devices and -40°C to +85°C for E devices. The SO versions, with more pins than the 8-lead PDIP, have additional outputs not available in DIP packages. These are RESET (without inversion) and watchdog output (active-low WDO).

Simplified Block Diagram

MAX698, MAX699: Typical Operating Circuit MAX698, MAX699: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .