MC33064DM View Datasheet(PDF) - Microsemi Corporation
Part Name
Description
Manufacturer
MC33064DM Datasheet PDF : 10 Pages
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PRODUCT DATABOOK 1996/1997
MC33064/MC34064
UNDERVOLTAGE SENSING CIRCUIT
PRODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET
VIN
POWER
SUPPLY
RESET
R
CDLY
MICROPROCESSOR
CIRCUIT
FIGURE 16. — SWITCHING THE LOAD OFF WHEN
BATTERY REACHES BELOW 4.3V
1.2 VREF
VIN
LOAD
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 RCDLY time constant be greater than 5.0µs.
VTH(MPU) is the microprocessor reset input threshold.
tDLY = R CDLY In
1
1
-
VTH(MPU)
VIN
1.2 VREF
FIGURE 17. — VOLTAGE MONITOR
VIN
POWER
SUPPLY
1.0k
RESET
FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
VCC
4.3V
270
RL
SMP60N03-10L
VIN
RESET
1.2 VREF
1.2 VREF
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.
Copyright © 1999
Rev. 1.3 6/99
9
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