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MAX818L Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX818L Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page _______________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 specif- ically 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. These devices offer two pretrimmed reset threshold volt- ages for ±5% or ±10% power supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX817/ MAX818/MAX819 are available in space-saving µMAX packages, as well as 8-pin DIP/SO. ________________________Applications Battery-Powered Computers and Controllers Embedded Controllers Intelligent Instruments Critical µP Monitoring Portable Equipment ____________________________Features o Precision Supply-Voltage Monitor: 4.65V (MAX81_L) 4.40V (MAX81_M) o 11µA Quiescent Supply Current o 200ms Reset Time Delay o Watchdog Timer with 1.6sec Timeout (MAX817/MAX818) o Battery-Backup Power Switching; Battery Voltage Can Exceed VCC o Battery Freshness Seal o On-Board, 3ns Gating of Chip-Enable Signals (MAX818) o Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819) o Manual Reset Input (MAX819) +5V Microprocessor Supervisory Circuits ________________________________________________________________ Maxim Integrated Products 1 WDI GND PFO PFI 1 2 8 7 BATT RESET VCC OUT MAX817 DIP/SO/ µMAX TOP VIEW 3 4 6 5 _________________Pin Configurations 19-0494; Rev 1; 3/96 PART† MAX817_CPA MAX817_CSA MAX817_CUA 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 8 Plastic DIP 8 SO 8 µMAX ______________Ordering Information _____________________Selector Guide Ordering Information continued on last page. †These parts offer a choice of reset threshold voltage. From the table below, select the suffix corresponding to the desired threshold and insert it into the blank to complete the part number. For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 SUFFIX RESET THRESHOLD (V) L 4.65 M 4.40 FEATURE MAX817 L/M Active-Low Reset Backup-Battery Switchover MAX818 L/M MAX819 L/M Power-Fail Comparator — Watchdog Input — Battery Freshness Seal Manual Reset Input — — Chip-Enable Gating — Pin-Package 8-DIP/SO/ µMAX 8-DIP/SO/ µMAX — 8-DIP/SO/ µMAX Low-Power, Pin- Compatible Upgrades for: MAX690A/ MAX692A — MAX703/ MAX704 Typical Operating Circuit appears at end of data sheet. Pin Configurations continued at end of data sheet. *Patents Pending |
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