MAX801L MAXIM [Maxim Integrated Products], MAX801L Datasheet
MAX801L
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MAX801L Summary of contents
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Rev 0; 6/96 _______________General Description The MAX801/MAX808 microprocessor (µP) supervisory circuits monitor and control the activities of +5V µPs by providing backup-battery switchover, low-line indica- tion, and µP reset. Additional features include a watch- dog for the MAX801 and ...
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Supervisory Circuits with ±1.5% Reset Accuracy ABSOLUTE MAXIMUM RATINGS Input Voltage (with respect to GND) V .......................................................................-0. ....................................................................-0.3V to +6V BATT All Other Pins........................................-0. Input Current V Peak ..........................................................................1. Continuous ...
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ELECTRICAL CHARACTERISTICS (continued 4.6V to 5.5V for the MAX80_L Typical values are MIN MAX CC PARAMETER SYMBOL RESET AND LOW-LINE V CC Reset Threshold V RST ...
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Supervisory Circuits with ±1.5% Reset Accuracy ELECTRICAL CHARACTERISTICS (continued 4.6V to 5.5V for the MAX80_L Typical values are MIN MAX CC PARAMETER SYMBOL CHIP-ENABLE ...
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Operating Characteristics (continued 5V 2.8V, no load +25°C, unless otherwise noted.) CC BATT A MAX808 CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCE 8 50 DRIVER 100 ...
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Supervisory Circuits with ±1.5% Reset Accuracy ____________________________Typical Operating Characteristics (continued 5V 2.8V, no load +25°C, unless otherwise noted.) CC BATT A BATTERY CURRENT vs. INPUT SUPPLY VOLTAGE ...
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Description (continued) PIN NAME MAX801 MAX808 5 — RESET CE OUT — — WDI CE IN — BATT 8 8 OUT V CC BATT BATTERY-BACKUP COMPARATOR RESET COMPARATOR LOW-LINE COMPARATOR 2.275V GND CE IN ...
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Supervisory Circuits with ±1.5% Reset Accuracy V V RST LOWLINE RESET V RESET t RP (MAX801 OUT (MAX808) V BATT SHOWN FOR 5V ...
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REGULATOR LOWLINE HOLD MAX801 MAX808 GND C > HOLD LOAD SHDN V LR Figure 3. Using LOWLINE to Provide a Power-Fail Warning to the µP calculate the amount of capacitance required ...
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Supervisory Circuits with ±1.5% Reset Accuracy MAX801 Watchdog Timer The watchdog monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within 1.6sec, reset asserts for the reset timeout period. The internal 1.6sec timer ...
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V (max) RST V CC MAX808 OUT 50 DRIVER GND Figure 7. MAX808 CE Gate Test Circuit Chip-Enable Output In enabled mode, CE OUT’s impedance is equivalent to 75Ω in series with the source driving CE IN. ...
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Supervisory Circuits with ±1.5% Reset Accuracy Watchdog Software Considerations To help the watchdog timer keep a closer watch on software execution, you can set and reset the watch- dog input at different points in the program, rather than ...