lx7001 Microsemi Corporation, lx7001 Datasheet - Page 8

• Manufacturer Part Number: lx7001
• Description: Transient Immune Undervoltage Sensing Circuit
• Manufacturer: Microsemi Corporation

LX7001
8
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
TH(MPU)
POWER
SUPPLY
POWER
SUPPLY
FIGURE 13. — LOW VOLTAGE MICROPROCESSOR RESET.
is the microprocessor reset input threshold.
V
FIGURE 15. — VOLTAGE MONITOR.
IN
t
1.2 V
DLY
V
= R C
REF
IN
1.2 V
REF
DLY
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
T
RANSIENT
V
1
TH(MPU)
V
IN
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
RESET
P
R O D U C T I O N
R
C
DLY
I
M M U N E
MICROPROCESSOR
RESET
CIRCUIT
1.0k
DLY
U
NDERV O LTAGE
.
4.3V
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 LX7001C, its output grounds the gate
of the L
D
A T A
FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.
2
MOSFET.
S
FIGURE 14. — SWITCHING THE LOAD OFF WHEN
V
ENSING
S
IN
1.2 V
H E E T
V
IN
1.2 V
REF
BATTERY REACHES BELOW 4.3V.
REF
C
IRCUIT
270
RESET
RESET
V
CC
Copyright © 1999
R
SMP60N03-10L
L
Rev. 1.2
LOAD
6/99