MC33064 Microsemi Corporation, MC33064 Datasheet - Page 9

• Manufacturer Part Number: MC33064
• Description: (MC33064 / MC34064) UNDERVOLTAGE SENSING CIRCUIT
• Manufacturer: Microsemi Corporation

Copyright © 1999
Rev. 1.3
A time delayed reset can be accomplished with the addition of C
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RC
V
POWER
TH(MPU)
SUPPLY
6/99
POWER
SUPPLY
FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET
is the microprocessor reset input threshold.
V
IN
1.2 V
t
FIGURE 17. — VOLTAGE MONITOR
DLY
REF
V
= R C
IN
1.2 V
DLY
REF
DLY
In
time constant be greater than 5.0µs.
1 -
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
V
1
TH(MPU)
V
RESET
IN
T Y P I C A L A P P L I C A T I O N C I R C U I T S
U
P
N D E R V O L T A G E
R O D U C T I O N
R
C
DLY
MICROPROCESSOR
RESET
CIRCUIT
DLY
1.0k
.
S
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 L
E N S I N G
D
4.3V
A T A
FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
2
MOSFET.
FIGURE 16. — SWITCHING THE LOAD OFF WHEN
C
S
I R C U I T
V
IN
H E E T
1.2 V
V
IN
BATTERY REACHES BELOW 4.3V
REF
1.2 V
MC33064/MC34064
REF
270
RESET
RESET
V
CC
R
SMP60N03-10L
L
LOAD
9