ICL7665SACPAZ Intersil, ICL7665SACPAZ Datasheet - Page 9

• Manufacturer Part Number: ICL7665SACPAZ
• Description: IC VOLT DETECTOR OVER/UND 8-DIP
• Manufacturer: Intersil
• Type: Multi-Voltage Supervisorr

Specifications of ICL7665SACPAZ

• Number Of Voltages Monitored: 2
• Output: Open Drain or Open Collector
• Reset: Active High
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Reset Timeout: -

NO HYSTERESIS
Overvoltage V
Overvoltage V
HYSTERESIS PER FIGURE 10A
V
Overvoltage V
V
V
Undervoltage V
V
HYSTERESIS PER FIGURE 11
V
Overvoltage V
V
V
Overvoltage V
V
U1
L1
U2
L2
U1
L1
U2
L2
FIGURE 11. AN ALTERNATIVE HYSTERESIS CIRCUIT
R
R
=
=
=
=
=
=
=
=
21
11
R
R
R
R
R
R
R
11
12
11
12
11
12
R
11
R
R
R
R
R
+
12
31
+ R
+ R
+ R
+
P
11
12
TRIP
TRIP
TRIP
+ R
11
TRIP
TRIP
+ R
R
TABLE 1. SET-POINT EQUATIONS
TRIP
+ R
R
R
12
R
R
R
21
22
21
R
11
22
12
R
21
21
11
12
R
22
22
21
22
=
=
+ R
+ R
+ R31
x V
x V
x V
R
+ R
R
31
32
32
x V
31
SET1
SET2
SET1
OUT1
HYST1
SET1
32
R
R
SET2
x V
11
12
x V
V
x V
x V
R
R
IN
+ R
+ R
12
SET1
11
SET2
V+
SET1
SET2
9
21
22
HYST2
OUT2
SET2
x V
x V
SET1
SET2
R
R
P
32
R
R
22
12
ICL7665S
Applications
Single Supply Fault Monitor
Figure 12 shows an over/under voltage fault monitor for a
single supply. The overvoltage trip point is centered around
5.5V and the undervoltage trip point is centered around 4.5V.
Both have some hysteresis to prevent erratic output ON and
OFF conditions. The two outputs are connected in a wired
OR configuration with a pullup resistor to generate a power
OK signal.
Multiple Supply Fault Monitor
The ICL7665S can simultaneously monitor several supplies
when connected as shown in Figure 13. The resistors are
chosen such that the sum of the currents through R
R
two input voltage are at the desired low voltage detection
point. The current through R
1.3V/R
voltage of both supplies being monitored. The trip voltage of
one supply while the other supply is at the nominal voltage
will be different that the trip voltage when both supplies are
below their nominal voltages.
The other side of the ICL7665S can be used to detect the
absence of negative supplies. The trip points for OUT1
depend on both the negative supply voltages and the actual
voltage of the +5V supply.
R
OPEN VOLTAGE
DETECTOR
V
V
21B
21
U
L
= 5.45V
FIGURE 12. FAULT MONITOR FOR A SINGLE SUPPLY
= 5.55V
13MΩ
, and R
324kΩ
11
5%
100kΩ
. The voltage at the V
R
31
31
is equal to the current through R
HYST1
V
OUT1
SET1
+5V SUPPLY
V+
HYST2
V
11
OUT2
SET2
SET
at this point is equal to
input depends on the
R
1MΩ
V+
32
100kΩ
249kΩ
7.5MΩ
5%
OPEN VOLTAGE
DETECTOR
V
V
U
L
11
= 4.45V
= 4.55V
R
POWER
OK
when the
22
21A
April 5, 2006
FN3182.8
,