模拟IC Analog IC
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
