CAX803, CAX809, CAX810
3-Pin Microprocessor
Power Supply Supervisors
Description
The CAX803, CAX809, and CAX810 are supervisory circuits that
monitor power supplies in digital systems. The CAX803, CAX809,
and CAX810 are direct replacements for the MAX803, MAX809 and
MAX810 in applications operating over the industrial temperature range.
These devices generate a reset signal, which is asserted while the
power supply voltage is below a preset threshold level and for at least
140 ms after the power supply level has risen above that level. The
underlying floating gate technology, Analog EEPROM used by
ON Semiconductor, makes it possible to offer any custom reset
threshold value. Seven industry standard threshold levels are offered
to support +5.0 V, +3.3 V, +3.0 V and +2.5 V systems.
The CAX803 has an open−drain RESET output (active LOW). The
CAX803 requires a pull−up resistor on the reset output.
The CAX809 features a push−pull RESET output (active LOW) and
the CAX810 features a push−pull RESET output (active HIGH).
Fast transients on the power supply are ignored and the output is
guaranteed to be in the correct state at V
CC
levels as low as 1.0 V.
The CAX803, CAX809, and CAX810 are available in the compact
3−pin SOT−23 package.
Features
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SOT−23
TB SUFFIX
CASE 527AG
PIN CONFIGURATION
1
GND
3
V
CC
2
RESET
(RESET)
(Top View)
CAX803
CAX809
(CAX810)
3−Lead SOT23
•
Precision Monitoring of
•
•
•
•
•
•
•
•
•
•
•
•
•
•
+5.0 V (−5%,
−10%, −20%),
+3.3 V (−5%,
−10%),
+3.0 V (−10%) and
+2.5 V (−5%) Power Supplies
Offered in Three Output Configurations:
−
CAX803: Open−Drain Active LOW Reset
−
CAX809: Push−Pull Active LOW Reset
−
CAX810: Push−Pull Active HIGH Reset
Direct Replacements for the MAX803, MAX809 and MAX810 in
Applications Operating over the Industrial Temperature Range
Reset Valid down to V
CC
= 1.0 V
10
mA
Power Supply Current
Power Supply Transient Immunity
Industrial Temperature Range:
−40°C
to +85°C
Available in SOT−23 Package
These Devices are Pb−Free and are RoHS Compliant
Computers, Servers, Laptops, Cable Modems
Wireless Communications
Embedded Control Systems
White Goods, Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
MARKING DIAGRAMS
XXXMG
G
SOT−23
XXX
M
G
= Specific Device Code
= Month Code
= Pb−Free Package
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
Applications
©
Semiconductor Components Industries, LLC, 2012
October, 2012
−
Rev. 1
1
Publication Order Number:
CAX803/D
CAX803, CAX809, CAX810
Table 1. THRESHOLD SUFFIX SELECTOR
Nominal Threshold Voltage
4.63 V
4.55 V
4.38 V
4.00 V
3.08 V
2.93 V
2.63 V
2.32 V
Threshold Suffix Designation
L
H
M
J
T
S
R
Z
Table 2. PIN DESCRIPTIONS
Pin Number
CAX803
1
2
−
3
CAX809
1
2
−
3
CAX810
1
−
2
3
Name
GND
RESET
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.
Active HIGH reset. RESET is asserted if V
CC
falls below the reset threshold and
remains high for at least 140 ms after V
CC
rises above the reset threshold.
Power supply voltage that is monitored.
Description
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameter
Any pin with respect to ground
Input Current, V
CC
Output Current, RESET, RESET
Rate of Rise, V
CC
Continuous Power Dissipation
Derate 4 mW/°C above 70°C (SOT23)
Operating Temperature Range
Storage Temperature Range
Lead Soldering Temperature (10 sec)
Rating
−0.3
to +6.0
20
20
100
320
−40
to +85
−65
to +105
300
Units
V
mA
mA
V/ms
mW
°C
°C
°C
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
CAX803, CAX809, CAX810
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
DIGITAL
DELAY
RESET
VOLTAGE
REFERENCE
GND
CAX803
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
DIGITAL
DELAY
RESET
VOLTAGE
REFERENCE
GND
CAX809
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
DIGITAL
DELAY
RESET
VOLTAGE
REFERENCE
GND
CAX810
Figure 1. Block Diagrams
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CAX803, CAX809, CAX810
Table 4. ELECTRICAL CHARACTERISTICS
(V
CC
= Full range, T
A
=
−40°C
to +85°C, unless otherwise specified. Typical values at T
A
= +25°C and V
CC
= 5 V for the L/H/M/J
versions, V
CC
= 3.3 V for the T/S versions, V
CC
= 3 V for the R version and V
CC
= 2.5 V for the Z/V versions.)
Symbol
Parameter
V
CC
Range
I
CC
V
TH
Supply Current
Conditions
T
A
= 0°C to +70°C
T
A
=
−40°C
to +85°C
T
A
=
−40°C
to +85°C
L Threshold
V
CC
< 5.5 V, J/L/M/H
V
CC
< 3.6 V, R/S/T/Z/V
T
A
= +25°C
T
A
=
−40°C
to +85°C
H Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
M Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
J Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
T Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
S Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
R Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
Z Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
Reset Threshold Tempco
T
D
T
R
V
OL
V
CC
to Reset Delay (Note 2)
Reset Active Timeout Period
RESET Output Voltage Low
(Open−drain active LOW,
CAX803 and push−pull,
active LOW, CAX809)
V
CC
= V
TH
to (V
TH
−
100 mV)
T
A
=
−40°C
to +85°C
V
CC
= V
TH
min, I
SINK
= 1.2 mA
CAX803R/S/T/Z, CAX809R/S/T/Z/V
V
CC
= V
TH
min, I
SINK
= 3.2 mA
CAX803J/L/M, CAX809J/L/M/H
V
CC
> 1.0 V, I
SINK
= 50
mA
V
OH
RESET Output Voltage High
(Push−pull, active LOW,
CAX809)
V
CC
= V
TH
max, I
SOURCE
= 500
mA
CAX809R/S/T/Z/V
V
CC
= V
TH
max, I
SOURCE
= 800
mA
CAX809J/L/M/H
V
CC
> V
TH
max, I
SINK
= 1.2 mA
CAX810R/S/T/Z
V
CC
> V
TH
max, I
SINK
= 3.2 mA
CAX810J/L/M
1.8 V < V
CC
V
TH
min,
I
SOURCE
= 150
mA
0.8 V
CC
0.8 V
CC
V
CC
−
1.5
0.3
0.4
V
V
140
4.56
4.50
4.48
4.43
4.31
4.25
3.93
3.89
3.04
3.00
2.89
2.85
2.59
2.55
2.28
2.25
30
20
240
460
0.3
0.4
0.3
V
2.32
2.63
2.93
3.08
4.00
4.38
4.55
Min
1.0
1.2
15
10
4.63
Typ
(Note 1)
Max
5.5
5.5
25
15
4.70
4.75
4.62
4.67
4.45
4.50
4.06
4.10
3.11
3.15
2.96
3.00
2.66
2.70
2.35
2.38
ppm/°C
ms
ms
V
V
mA
Units
V
Reset Threshold Voltage
V
OL
RESET Output Voltage Low
(Push−pull, active HIGH,
CAX810)
V
OH
RESET Output Voltage High
(Push−pull, active HIGH,
CAX810)
1. Production testing done at T
A
= +25°C; limits over temperature guaranteed by design only.
2. RESET output for the CAX809; RESET output for the CAX810.
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CAX803, CAX809, CAX810
(V
CC
= Full range, T
A
=
−40°C
to +85°C, unless otherwise specified. Typical values at T
A
= +25°C and V
CC
= 5 V for the
L/M/J versions, V
CC
= 3.3 V for the T/S versions, V
CC
= 3 V for the R version and V
CC
= 2.5 V for the Z version.)
NORMALIZED SUPPLY CURRENT (mA)
260
POWER−UP RESET TIMEOUT (mS)
240
220
200
180
160
−50
V
CC
= 2.5 V
V
CC
= 5 V
1.9
1.6
1.3
1.0
0.7
0.4
0
−50
TYPICAL OPERATING CHARACTERISTICS
0
50
TEMPERATURE (°C)
100
150
0
50
TEMPERATURE (°C)
100
150
Figure 2. Power−up Reset Timeout vs.
Temperature
POWER−DOWN RESET DELAY (mS)
14
NORMALIZED THRESHOLD
12
10
8
6
4
2
0
−50
0
50
TEMPERATURE (°C)
100
1.0002
1.0000
0.9998
0.9996
0.9994
0.9992
0.9990
0.9988
0
Figure 3. Supply Current vs. Temperature
(No Load, CAX8xxR/S/T/Z)
150
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 4. Power−down Reset Delay vs.
Temperature (CAX8xxR/S/T/Z)
Figure 5. Normalized Reset Threshold vs.
Temperature
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