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MC34064DM Datasheet(PDF) 9 Page - Microsemi Corporation |
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MC34064DM Datasheet(HTML) 9 Page - Microsemi Corporation |
9 / 10 page U NDER VOL T AGE S ENSING C IRCUIT MC33064/MC34064 PRODUCT DA T ABOOK 1996/1997 9 Copyright © 1999 Rev. 1.3 6/99 P RODUCTION D AT A S HEET TYPICAL APPLICA TION CIRCUITS FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET A time delayed reset can be accomplished with the addition of C DLY. For systems with extremely fast power supply rise times (< 500ns) it is recommended that the RC DLY time constant be greater than 5.0µs. V TH(MPU) is the microprocessor reset input threshold. Overheating of the logic level power MOSFET due to insufficient gate voltage can be prevented with the above circuit. When the input signal is below the 4.6 volt threshold of the MC34064, its output grounds the gate of the L2 MOSFET. FIGURE 17. — VOLTAGE MONITOR FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION V TH(MPU) V IN 1 - t DLY = R CDLY In 1 FIGURE 16. — SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V POWER SUPPLY 1.2 V REF MICROPROCESSOR CIRCUIT RESET C DLY R V IN 1.2 V REF LOAD RESET V IN POWER SUPPLY 1.2 V REF RESET V IN 1.0k 1.2 V REF RESET V IN 270 4.3V V CC R L SMP60N03-10L |
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