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Microprocessor and Nonvolatile Memory Supervisory Circuits

Microprocessor and Non-Volatile Memory Supervisory Circuits

Product Details

Key Features

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) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Cap Adjustable
Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 150
Package/Pins PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes)
4.51
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Simplified Block Diagram

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Parameters

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) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Cap Adjustable
Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 150
Package/Pins PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes)
4.51

Key Features

  • Manual-Reset Input
  • 200ms Power OK/Reset Time Delay
  • Independent Watchdog Timer-Preset or Adjustable
  • On-Board Gating of Chip-Enable Signals
  • Memory Write-Cycle Completion
  • 10ns (max) Chip-Enable Gate Propagation Delay
  • Voltage Monitor for Overvoltage Warning
  • ±2% Reset and Low-Line Threshold Accuracy (MAX820, external programming mode)

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP Monitoring
  • Intelligent Instruments

Description

The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include the following:
  • µP reset: Assertion of RESET and active-low RESET outputs during power-up, power-down, and brownout conditions. Active-low RESET is guaranteed valid for VCC down to 1V.
  • Manual-reset input.
  • Two-stage power-fail warning: A separate low-line comparator compares VCC to a preset threshold 120mV above the reset threshold; the low-line and reset thresholds can be programmed externally.
  • Watchdog fault output: Assertion of active-low WDO if the watchdog input is not toggled within a preset timeout period.
  • Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout that causes hardware shutdown.
  • Write protection of CMOS RAM, EEPROM, or other memory devices.
The MAX792 and MAX820 are identical, except the MAX820 guarantees higher low-line and reset threshold accuracy (±2%).

Simplified Block Diagram

MAX792, MAX792L, MAX792M, MAX792R, MAX792S, MAX792T, MAX820, MAX820L, MAX820M, MAX820R, MAX820S, MAX820T: Typical Operating Circuit MAX792, MAX792L, MAX792M, MAX792R, MAX792S, MAX792T, MAX820, MAX820L, MAX820M, MAX820R, MAX820S, MAX820T: 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 .