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MAX792RMJE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX792RMJE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page Microprocessor and Non-Volatile Memory Supervisory Circuits ________________________________________________________________ Maxim Integrated Products 1 19-0147; Rev. 2; 6/98 General 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 dur- ing power-up, power-down, and brownout condi- tions. RESET is guaranteed valid for VCC down to 1V. 2) Manual-reset input. 3) Two-stage power-fail warning: A separate low-line comparator compares VCC to a preset threshold 120mV above the reset threshold; the low-line and reset thresholds can be programmed externally. 4) Watchdog fault output: Assertion of WDO if the watch- dog 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%). Applications Computers Controllers Intelligent Instruments Critical µP Power Monitoring Features 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 Completion 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) 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 volt- ages. Select the letter corresponding to the desired nominal reset threshold voltage and insert it into the blank to complete the part number. MAX792 4 5 7 8 9 1 10 6 14 ADDRESS DECODER RESET IN/INT LLIN/ REFOUT OVI SWT 3 VCC GND 12 MR RESET LOW LINE OVO CE IN CE OUT 0.1µF VCC RAM A0-A15 VCC GND NMI RESET µP 13 Typical Operating Circuit PART** TEMP. RANGE PIN-PACKAGE MAX792_CPE 0°C to +70°C 16 Plastic DIP MAX792_CSE 0°C to +70°C 16 Narrow SO MAX792_C/D 0°C to +70°C Dice* SUFFIX RESET THRESHOLD (V) 4.62 4.37 3.06 2.91 2.61 L M T S R For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Ordering Information |
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