The MAX791 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. The 50µA supply current makes the MAX791 ideal for use in portable equipment, while the 6ns chip-enable propagation delay and 250mA output capability (25mA in battery-backup mode) make it suitable for larger, higher-performance equipment. The MAX791 comes in 16-pin DIP and narrow SO packages and provides the following functions: * µP reset-RESET-bar output is asserted during power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V, even with no battery in the circuit. * Manual-reset input. * A 1.25V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V. * Two-stage power-fail warning-a separate low-line comparator compares VCC to a threshold 150mV above the reset threshold. * Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic. * Software monitoring of backup-battery voltage. * A watchdog-fault output is asserted if the watchdog input has not been toggled within either a preset or an adjustable timeout period. * Write protection of CMOS RAM or EEPROM. * Pulsed watchdog output, to give advance warning of impending WDO-bar assertion caused by watchdog timeout. Applications * Computers: Desktop, Workstation, Server * Controllers * Critical µP Monitoring * Intelligent Instruments * Portable Battery-Powered Equipment * Precision 4.65V Voltage Monitoring * 200ms Power-OK/Reset Time Delay * Independent Watchdog Timer-Preset or Adjustable * 1µA Standby Current * Power Switching * 250mA Output in VCC Mode * 25mA Output in Battery-Backup Mode * On-Board Gating of Chip-Enable Signals * Memory Write-Cycle Completion * 6ns CE Gate Propagation Delay * MaxCap™ or SuperCap™ Compatible * Voltage Monitor for Power-Fail or Low-Battery Warning * Backup-Battery Monitor * Guaranteed RESET-bar Valid to VCC = 1V https://elecena.pl/product/22337670/microprocessor-supervisory-circuit 2022-12-29 https://elecena.pl/product/22337670/microprocessor-supervisory-circuit 2025-01-20