MAX817LEPA

\+ 5V微处理器监控电路 +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, backup battery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide below lists the specific functions available from each device.

Features

♦ 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

Applications

  Battery-Powered Computers and Controllers

  Embedded Controllers

  Intelligent Instruments

  Critical µP Monitoring

  Portable Equipment