X40430 INTERSIL [Intersil Corporation], X40430 Datasheet - Page 4

• Manufacturer Part Number: X40430
• Description: Triple Voltage Monitor with Integrated CPU Supervisor
• Manufacturer: INTERSIL [Intersil Corporation]

Low Voltage V
During operation, the X40430, X40431, X40434,
X40435
RESET/RESET if supply voltage falls below a preset
minimum V
the microprocessor from operating in a power fail or
brownout
remains active until the voltage drops below 1V. It also
remains active until V
for
Low Voltage V2 Monitoring
The X40430 also monitors a second voltage level and
asserts V2FAIL if the voltage falls below a preset mini-
mum V
RESET to prevent the microprocessor from operating
in a power fail or brownout condition or used to inter-
rupt the microprocessor with notification of an impend-
ing power failure.
For the X40430 and X40431 the V2FAIL signal
remains active until the V2MON drops below 1V
(V2MON falling). It also remains active until V2MON
returns and exceeds V
cuitry monitors the power supply connected to V2MON
pin. If V
For the X40434 and X40435, the V2FAIL signal
remains active until V
active until V2MON returns and exceeds V
sense circuitry is powered by V
cannot be monitored.
Low Voltage V3 Monitoring
The X40430, X40431, X40434, X40435 also monitors
a third voltage level and asserts V3FAIL if the voltage
falls below a preset minimum V
nal is either ORed with RESET to prevent the micro-
processor from operating in a power fail or brownout
condition or used to interrupt the microprocessor with
notification of an impending power failure. The V3FAIL
signal remains active until the V3MON drops below 1V
(V3MON falling). It also remains active until V3MON
returns and exceeds V
This voltage sense circuitry monitors the power supply
connected to V3MON pin. If V
be monitored.
Early Low V
This
RESET/RESET whenever V
voltage and returns high when V
V
(t
PURST
TRIP1
t
PURST
CMOS
TRIP2
) on this pin.
CC
voltage. There is no power-up delay circuitry
.
monitors
= 0, V2MON can still be monitored.
TRIP1
condition.
. The V2FAIL signal is either ORed with
CC
CC
Detection (LOWLINE)
output
. The RESET/RESET signal prevents
(V1 Monitoring)
the
CC
CC
TRIP3
TRIP2
The
drops below 1V and remains
goes
returns and exceeds V
4
V
.
CC
CC
. This voltage sense cir-
CC
RESET/RESET
CC
TRIP3
falls below the V
LOW
= 0, V3MON can still
level
. If V
. The V3FAIL sig-
CC
X40430, X40431, X40434, X40435
CC
and
earlier
exceeds the
= 0, V2MON
TRIP2
asserts
signal
. This
TRIP1
TRIP1
than
Figure 2. Two Uses of Multiple Voltage Monitoring
Notice: No external components required to monitor three voltages.
6-10V
Unreg.
Supply
1M
390K
1.8V
3.0V
Reg
Reg
Reg
5V
3.3V
5V
X40431-A
V
V2MON
V3MON
(1.7V)
X40431-B
V
V2MON
V3MON
CC
CC
RESET
V2FAIL
V3FAIL
RESET
V2FAIL
V3FAIL
V
CC
V
CC
July 29, 2005
System
Reset
Power
Fail
Interrupt
System
Reset
FN8251.0