MC34164 Microsemi Corporation, MC34164 Datasheet - Page 7

• Manufacturer Part Number: MC34164
• Description: 5V UNDERVOLTAGE SENSING CIRCUIT
• Manufacturer: Microsemi Corporation

Copyright © 1997
Rev. 1.5
11/97
POWER
SUPPLY
FIGURE 7. — SWITCHING THE LOAD OFF WHEN
2
1.2 V
BATTERY VOLTAGE REACHES BELOW 4.3V
4
REF
FIGURE 9. — VOLTAGE MONITOR
2
1.2 V
3
REF
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
5 V U
1
RESET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
P
R O D U C T I O N
N D E R V O L T A G E
RESET
1
1.0k
LOAD
D
S
4.3V
POWER
SUPPLY
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
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 4.3 volt threshold of the MC34164, its
output grounds the gate of the L
E N S I N G
TH(MPU)
A T A
FIGURE 10. — MOSFET LOW-VOLTAGE GATE DRIVE PROTECTION
FIGURE 8. — LOW-VOLTAGE MICROPROCESSOR RESET
is the microprocessor reset input threshold.
S
2
H E E T
1.2 V
C
t
I R C U I T
DLY
2
3
REF
1.2 V
= R C
MC33164/MC34164
3
REF
DLY
DLY
In
time constant be greater than 5.0µs.
2
1 -
270
MOSFET.
V
1
TH(MPU)
V
1
IN
1
R
RESET
C
DLY
MICROPROCESSOR
V
CIRCUIT
CC
R
SMP60N03-10L
L
DLY
.
7