CAT8801
200 nA Microprocessor
Power Supply Supervisors
Description
The CAT8801 is a supervisory circuit that monitors power supplies
in digital systems and provides a reset signal whenever the system’s
input voltage is below a prescribed minimum level. The CAT8801
replaces popular voltage supervisors such as MAX809 in applications
where operating current is a primary consideration.
CAT8801 generates a reset signal, which is asserted while the power
supply voltage is below a preset threshold level and remains asserted
for at least 140 ms after the power supply level has risen above that
level. Nine industry standard threshold levels are offered to support
+5.0 V, +3.3 V, +3.0 V, +2.5 V and +1.8 V systems. ON Semiconductor’s
floating gate technology, used in programming the trigger thresholds,
makes it possible to quickly offer any custom reset threshold value
should the 9 standard voltage thresholds not meet a system’s needs.
The CAT8801 features a Push−Pull CMOS RESET output (active
LOW) and is fully specified over the industrial temperature range of
−40°C
to 85°C.
CAT8801 is available in compact 3−pin SOT23 and SC−70
packages.
Features
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SOT−23
TB SUFFIX
CASE 527AG
SC−70
SD SUFFIX
CASE 419AB
PIN CONNECTIONS
1
GND
CAT8801
2
RESET
3−Lead SOT−23
3−Lead SC−70
(Top View)
3
V
CC
•
Precision Voltage Monitoring of +1.8 V, +2.5 V, +3.0 V, +3.3 V and
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+5.0 V Power Supplies
Ultra Low 200 nA Supply Current
±1.2%
Voltage Threshold Accuracy
270 ms Power−On Reset Timeout
Reset Signal Valid Down to V
CC
= 1 V
No External Components Necessary
High Immunity to Power−Supply Transients
Industrial Temperature Range:
−40°C
to +85°C
Available in RoHS−compliant SOT−23 and SC−70 Packages
Computers
Servers
Laptops
Cable Modems
Wireless Communications
Embedded Control Systems
Power Meters
PDAs and Handheld Equipment
THRESHOLD SUFFIX SELECTOR
Threshold Suffix
L
M
T
S
R
Z
Y
W
V
Nominal Threshold
4.625
4.380
3.075
2.925
2.630
2.320
2.190
1.670
1.580
Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
©
Semiconductor Components Industries, LLC, 2010
May, 2010
−
Rev. 4
1
Publication Order Number:
CAT8801/D
CAT8801
Table 1. PIN DESCRIPTION
Pin #
1
2
3
Name
GND
RESET
V
CC
Ground
Active LOW reset. RESET is asserted if V
CC
falls below the reset threshold and remains low for at least
140 ms after V
CC
rises above the reset threshold.
Power supply voltage that is monitored.
Description
Block Diagram
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
VOLTAGE
REFERENCE
CAT8801
GND
DIGITAL
DELAY
RESET
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Any pin with respect to ground
Input Current, V
CC
Output Current, RESET
Rate of Rise, V
CC
Continuous Power Dissipation
Derate 2.2 mW/°C above 70°C (SC−70)
Derate 4 mW/°C above 70°C (SOT−23)
Operating Temperature Range
Storage Temperature Range
Lead Soldering Temperature (10 seconds)
175
320
−40
to +85
−65
to +150
300
°C
°C
°C
Ratings
−0.3
to +6.0
20
20
100
Units
V
mA
mA
V/ms
mW
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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2
CAT8801
Table 3. ELECTRICAL CHARACTERISTICS
(Note 1)
(V
CC
= Full range, T
A
=
−40°C
to +85°C unless otherwise noted. Typical values at T
A
= +25°C.)
Symbol
V
CC
Range
I
CC
V
TH
Supply Current
Parameter
Test Conditions
T
A
= 0°C to +70°C
T
A
=
−40°C
to +85°C
V
TH
< V
CC
< 5.5 V
V
TH
< V
CC
< 3.6 V
Reset Threshold Voltage (Note 2)
L
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +25°C
T
A
=
−40°C
to +85°C
4.570
4.500
4.327
4.262
3.038
3.000
2.890
2.850
2.598
2.559
2.292
2.257
2.164
2.131
1.650
1.625
1.561
1.537
2
0.1
V
CC
= V
TH
to (V
TH
– 100 mV)
T
A
=
−40°C
to +85°C
I
SINK
= 2 mA
I
SOURCE
= 0.5 mA
0.8 x V
CC
140
20
270
50
460
0.4
1.580
1.670
2.190
2.320
2.630
2.925
3.075
4.380
Min
1.0
1.2
200
175
4.625
Typ
Max
5.5
5.5
400
350
4.681
4.750
4.433
4.498
3.112
3.150
2.960
3.000
2.662
2.701
2.348
2.383
2.216
2.249
1.690
1.715
1.599
1.623
%
mV/°C
ms
ms
V
V
V
nA
Units
V
M
T
S
R
Z
Y
W
V
V
TH_HYS
Threshold Hysteresis
Reset Threshold Temperature Coefficient
V
CC
to Reset Delay
Reset Active Timeout Period
V
OL
V
OH
RESET Output Voltage Low
RESET Output Voltage High
1. Production testing done at T
A
= +25°C; limits over temperature guaranteed by design.
2. Measured on falling edge of V
CC
.
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CAT8801
TYPICAL OPERATING CHARACTERISTICS
(V
CC
= Full range, T
A
=
−40°C
to +85°C unless otherwise noted. Typical values at T
A
= +25°C.)
350
V
CC
= 5.5 V
300
t
RST
(ms)
I
SB
(nA)
220
200
180
160
140
V
CC
= 1.8 V
120
200
−50
100
−50
V
CC
= 1.8 V
V
CC
= 5.5 V
250
−25
0
25
50
75
100
−25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 1. Power−Up Reset Timeout
5.0
POWER−DOWN RESET DELAY (ms)
4.5
4.0
3.5
3.0
2.5
−50
NORMALIZED THRESHOLD
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
−50
Figure 2. Supply Current vs. Temperature
−25
0
25
50
75
100
−25
0
25
50
75
100
125
150
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. Power−Down Reset Delay vs.
Temperature
Figure 4. Normalized Reset Threshold vs.
Temperature
Description
Reset Timing
The reset signal is asserted LOW for the CAT8801 when the power supply voltage falls below the threshold trip voltage and
remains asserted for at least 140 ms after the power supply voltage has risen above the threshold.
Threshold
Voltage
Reset Timeout Period
140ms
minimum
Power
Supply
Voltage
5V
0V
RESET
5V
0V
Figure 5. Reset Timing Diagram
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