MAX817

PRODUCTION

+5V Microprocessor Supervisory Circuits

Low-Power, Small Size Microprocessor Supervisory Circuit with Battery-Backup

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • Precision Supply-Voltage Monitor:
    • 4.65V (MAX81_L)
    • 4.40V (MAX81_M)
  • 11µA Quiescent Supply Current
  • 200ms Reset Time Delay
  • Watchdog Timer with 1.6sec Timeout (MAX817/MAX818)
  • Battery-Backup Power Switching; Battery Voltage Can Exceed VCC
  • Battery Freshness Seal
  • On-Board, 3ns Gating of Chip-Enable Signals (MAX818)
  • Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819)
  • Manual Reset Input (MAX819)

The MAX817/MAX818/MAX819 microprocessor (µP) supervisory circuits simplify power-supply monitoring, battery control, and chip-enable gating in µP systems by reducing the number of components required. These devices are designed for use in +5V-powered systems. Low supply current (11µA typical) and small package size make these devices ideal for portable applications. The MAX817/MAX818/MAX819 are specifically designed to ignore fast transients on VCC. Other supervisory functions include active-low reset, backup-battery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide in the full data sheet lists the specific functions available from each device.

These devices offer two pretrimmed reset threshold voltages for ±5% or ±10% power supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX817/ MAX818/MAX819 are available in space-saving µMAX® packages, as well as 8-pin DIP/SO.

Applications

  • Battery-Powered Computers/Controllers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Portable Equipment
MAX817
+5V Microprocessor Supervisory Circuits
MAX817L, M, MAX818L, M, MAX819L, M: Typical Operating Circuit
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Supervisory Circuits & Reset ICs 4
MAX6361
PRODUCTION SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6362
PRODUCTION SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6363
PRODUCTION SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6364
PRODUCTION SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
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