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MAX818L - +5V Microprocessor Supervisory Circuits

General Description

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.

Key Features

  • o Precision Supply-Voltage Monitor: 4.65V (MAX81_L) 4.40V (MAX81_M) o 11µA Quiescent Supply Current o 200ms Reset Time Delay o Watchdog Timer with 1.6sec Timeout (MAX817/MAX818) o Battery-Backup Power Switching; Battery Voltage Can Exceed VCC o Battery Freshness Seal o On-Board, 3ns Gating of Chip-Enable Signals (MAX818) o Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819) o Manual Reset Input (MAX819) MAX817L/M, MAX818L/M, MAX819L/M.
  • _____________________Sel.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-0494; Rev 1; 3/96 +5V Microprocessor Supervisory Circuits _______________General Description 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, backupbattery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide below lists the specific functions available from each device.