MAX792 Datasheet | Maxim Integrated

Description The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include the following: 1) µP reset: Assertion of RESET and RESET outputs during power-up, power-down, and brownout conditions. RESET is guaranteed valid for VCC down to 1V. 2) Manual-reset input. 3) Two-stage power-fail warning: A separate low-line parator pares VCC to a preset threshold 120m V above the reset threshold; the low-line and reset thresholds can be programmed externally. 4) Watchdog fault output: Assertion of WDO if the watchdog input is not toggled within a preset timeout period. 5) Pulsed watchdog output: Advance warning of impending WDO assertion from watchdog timeout that causes hardware shutdown. 6) Write protection of CMOS RAM, EEPROM, or other memory devices. The MAX792 and MAX820 are identical, except the MAX820 guarantees higher low-line and reset threshold accuracy (±2%). o Manual-Reset Input o 200ms Power-OK / Reset Time Delay o Independent Watchdog Timer- Preset or Adjustable o On-Board Gating of Chip-Enable Signals o Memory Write-Cycle pletion o 10ns (max) Chip-Enable Gate Propagation Delay o Voltage Monitor for Overvoltage Warning o ±2% Reset and Low-Line Threshold Accuracy (MAX820, external programming mode) Features MAX792/MAX820 Ordering Information PART- - MAX792_CPE MAX792_CSE MAX792_C/D TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO Dice- Ordering Information continued at end of data sheet. - Dice are tested at TA = +25°C, DC parameters only. - - These parts offer a choice of five different reset threshold voltages. Select the letter corresponding to the desired nominal reset threshold voltage and insert it into the blank to plete the part number. SUFFIX L M T S R RESET THRESHOLD (V) 4.62 4.37 3.06 2.91 2.61 Applications puters Controllers Intelligent Instruments Critical µP Power Monitoring Typical...