3-Pin Microprocessor Power Supply Supervisors

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 VCC 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
3
VCC
2
•
•
•
•
•
•
•
CAX803
CAX809
(CAX810)
RESET
(RESET)
(Top View)
• Precision Monitoring of
•
3−Lead SOT23
GND
+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 VCC = 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
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
•
•
•
•
•
•
Computers, Servers, Laptops, Cable Modems
Wireless Communications
Embedded Control Systems
White Goods, Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
© 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
Threshold Suffix Designation
4.63 V
L
4.55 V
H
4.38 V
M
4.00 V
J
3.08 V
T
2.93 V
S
2.63 V
R
2.32 V
Z
Table 2. PIN DESCRIPTIONS
Pin Number
CAX803
CAX809
CAX810
Name
1
1
1
GND
2
2
−
RESET
Active LOW reset. RESET is asserted if VCC falls below the reset threshold and
remains low for at least 140 ms after VCC rises above the reset threshold.
−
−
2
RESET
Active HIGH reset. RESET is asserted if VCC falls below the reset threshold and
remains high for at least 140 ms after VCC rises above the reset threshold.
3
3
3
VCC
Description
Ground
Power supply voltage that is monitored.
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Units
−0.3 to +6.0
V
20
mA
Output Current, RESET, RESET
20
mA
Rate of Rise, VCC
100
V/ms
Continuous Power Dissipation
Derate 4 mW/°C above 70°C (SOT23)
320
Any pin with respect to ground
Input Current, VCC
mW
Operating Temperature Range
−40 to +85
°C
Storage Temperature Range
−65 to +105
°C
300
°C
Lead Soldering Temperature (10 sec)
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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CAX803, CAX809, CAX810
VCC
VCC
VCC
TOLERANCE
BIAS
+
RESET
DIGITAL
DELAY
–
VOLTAGE
REFERENCE
CAX803
GND
VCC
VCC
VCC
TOLERANCE
BIAS
+
DIGITAL
DELAY
–
VOLTAGE
REFERENCE
RESET
CAX809
GND
VCC
VCC
VCC
TOLERANCE
BIAS
+
DIGITAL
DELAY
–
VOLTAGE
REFERENCE
RESET
CAX810
GND
Figure 1. Block Diagrams
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CAX803, CAX809, CAX810
Table 4. ELECTRICAL CHARACTERISTICS
(VCC = Full range, TA = −40°C to +85°C, unless otherwise specified. Typical values at TA = +25°C and VCC = 5 V for the L/H/M/J
versions, VCC = 3.3 V for the T/S versions, VCC = 3 V for the R version and VCC = 2.5 V for the Z/V versions.)
Symbol
Parameter
VCC Range
ICC
VTH
Supply Current
Reset Threshold Voltage
Conditions
Min
V
5.5
TA = −40°C to +85°C
1.2
5.5
TA = −40°C
to +85°C
VCC < 5.5 V, J/L/M/H
15
25
VCC < 3.6 V, R/S/T/Z/V
10
15
L Threshold
TA = +25°C
4.56
4.63
4.70
TA = −40°C to +85°C
4.50
TA = +25°C
4.48
TA = −40°C to +85°C
4.43
TA = +25°C
4.31
TA = −40°C to +85°C
4.25
TA = +25°C
3.93
TA = −40°C to +85°C
3.89
TA = +25°C
3.04
TA = −40°C to +85°C
3.00
TA = +25°C
2.89
TA = −40°C to +85°C
2.85
TA = +25°C
2.59
TA = −40°C to +85°C
2.55
TA = +25°C
2.28
TA = −40°C to +85°C
2.25
J Threshold
T Threshold
S Threshold
R Threshold
Z Threshold
Reset Threshold Tempco
TD
VCC to Reset Delay (Note 2)
VCC = VTH to (VTH − 100 mV)
TR
Reset Active Timeout Period
TA = −40°C to +85°C
VOL
RESET Output Voltage Low
(Open−drain active LOW,
CAX803 and push−pull,
active LOW, CAX809)
VOH
Units
1.0
M Threshold
VOL
Max
TA = 0°C to +70°C
H Threshold
VOH
Typ
(Note 1)
140
mA
V
4.75
4.55
4.62
4.67
4.38
4.45
4.50
4.00
4.06
4.10
3.08
3.11
3.15
2.93
2.96
3.00
2.63
2.66
2.70
2.32
2.35
2.38
30
ppm/°C
20
ms
240
460
ms
VCC = VTH min, ISINK = 1.2 mA
CAX803R/S/T/Z, CAX809R/S/T/Z/V
0.3
V
VCC = VTH min, ISINK = 3.2 mA
CAX803J/L/M, CAX809J/L/M/H
0.4
VCC > 1.0 V, ISINK = 50 mA
0.3
RESET Output Voltage High
(Push−pull, active LOW,
CAX809)
VCC = VTH max, ISOURCE = 500 mA
CAX809R/S/T/Z/V
0.8 VCC
VCC = VTH max, ISOURCE = 800 mA
CAX809J/L/M/H
VCC − 1.5
RESET Output Voltage Low
(Push−pull, active HIGH,
CAX810)
VCC > VTH max, ISINK = 1.2 mA
CAX810R/S/T/Z
0.3
VCC > VTH max, ISINK = 3.2 mA
CAX810J/L/M
0.4
RESET Output Voltage High
(Push−pull, active HIGH,
CAX810)
1.8 V < VCC VTH min,
ISOURCE = 150 mA
1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only.
2. RESET output for the CAX809; RESET output for the CAX810.
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0.8 VCC
V
V
V
CAX803, CAX809, CAX810
TYPICAL OPERATING CHARACTERISTICS
(VCC = Full range, TA = −40°C to +85°C, unless otherwise specified. Typical values at TA = +25°C and VCC = 5 V for the
L/M/J versions, VCC = 3.3 V for the T/S versions, VCC = 3 V for the R version and VCC = 2.5 V for the Z version.)
NORMALIZED SUPPLY CURRENT (mA)
VCC = 5 V
240
220
VCC = 2.5 V
200
180
160
−50
0
50
100
150
1.9
1.6
1.3
1.0
0.7
0.4
0
−50
50
100
150
TEMPERATURE (°C)
Figure 2. Power−up Reset Timeout vs.
Temperature
Figure 3. Supply Current vs. Temperature
(No Load, CAX8xxR/S/T/Z)
14
1.0002
12
1.0000
10
8
6
4
2
0
−50
0
TEMPERATURE (°C)
NORMALIZED THRESHOLD
POWER−DOWN RESET DELAY (mS)
POWER−UP RESET TIMEOUT (mS)
260
0
50
100
0.9998
0.9996
0.9994
0.9992
0.9990
0.9988
150
0
20
40
60
80
100
TEMPERATURE (°C)
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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120
CAX803, CAX809, CAX810
Detailed Descriptions
Reset Timing
The reset signal is asserted LOW for the CAX803/CAX809 and HIGH for the CAX810 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.
5V
VTH
VCC
0V
TR
TD
Reset Timeout Period
(140 ms
minimum)
5V
RESET/OUT
CAX803, CAX809
0V
5V
RESET
CAX810
0V
Figure 6. Reset Timing Diagram
30
VCC Transient Response
TAMB = 25°C
TRANSIENT DURATION (ms)
The CAX803/CAX809/CAX810 protect mPs against
brownout failure. Short duration transients of 4 msec or less
and 100 mV amplitude typically do not cause a false RESET.
Figure 7 shows the maximum pulse duration of negative−
going VCC transients that do not cause a reset condition.
As the amplitude of the transient goes further below the
threshold (increasing VTH − VCC), the maximum pulse
duration decreases. In this test, the VCC starts from an initial
voltage of 0.5 V above the threshold and drops below it by
the amplitude of the overdrive voltage (VTH − VCC).
25
20
15
CAX809Z
10
CAX809M
5
0
1
10
100
1000
RESET OVERDRIVE VTH − VCC (mV)
Figure 7. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
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CAX803, CAX809, CAX810
Valid RESET with VCC Under 1.0 V
To ensure that the CAX809 RESET pin is in a known state when VCC is under 1.0 V, a >10 kW pull−down resistor between
RESET pin and GND is recommended. For the CAX810, a pull−up resistor from RESET pin to VCC is needed.
Power
Supply
Power
Supply
VCC
VCC
10 kW
CAX810
CAX809
RESET
RESET
10 kW
GND
GND
Figure 8. RESET Valid with VCC Under 1.0 V
Figure 9. RESET Valid with VCC Under 1.1 V
Bi−directional Reset Pin Interfacing
The CAX809/810 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the
CAX809/810 reset output and the mP/mC bi−directional reset pin.
BUF
Power
Supply
Buffered
RESET
VCC
VCC
CAX809
mP
4.7 kW
(For example:
68HC11)
RESET
INPUT
RESET
GND
GND
Bi−directional
I/O Pin
Figure 10. Bi−directional Reset Pin Interfacing
CAX803 Open−Drain RESET Application
Power
Supply
The CAX803 features an open−drain RESET output and
therefore needs a pull−up resistor on the output for proper
operation, as shown on Figure 11. An advantage of the
open−drain output includes the ability to “wire AND”
several outputs together to form an inexpensive logic circuit.
It is also possible to have the pull−up resistor connected to
a different supply which can be higher than the CAX803
VCC pin. The value of the pull−up resistor is not critical in
most applications, typical values being between 5 kW and
10 kW.
VCC
5 kW
CAX803
VCC
mP
RESET
GND
RESET
INPUT
GND
Figure 11. Typical CAX803 Open−Drain
Circuit Configuration
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CAX803, CAX809, CAX810
PACKAGE DIMENSIONS
SOT−23, 3 Lead
CASE 527AG−01
ISSUE O
MIN
SYMBOL
D
3
E1
1
E
2
e
e1
A
0.89
1.12
0.013
0.10
b
0.37
0.50
c
0.085
0.18
D
2.80
3.04
E
2.10
2.64
E1
1.20
1.40
e
0.95 BSC
e1
1.90 BSC
L
0.40 REF
0.54 REF
0º
θ
A
MAX
A1
L1
TOP VIEW
NOM
8º
q
b
L1
A1
SIDE VIEW
L
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC TO-236.
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c
CAX803, CAX809, CAX810
Table 5. ORDERING PART NUMBER
Order Number
Voltage
CAX803LTBI−T3
4.63 V
CAX803MTBI−T3
4.38 V
CAX803JTBI−T3
4.00 V
CAX803TTBI−T3
3.08 V
CAX803STBI−T3
2.93 V
CAX803RTBI−T3
2.63 V
CAX803ZTBI−T3
2.32 V
CAX809LTBI−T3
4.63 V
CAX809HTBI−T3
4.55 V
CAX809MTBI−T3
4.38 V
CAX809JTBI−T3
4.00 V
CAX809TTBI−T3
3.08 V
CAX809STBI−T3
2.93 V
CAX809RTBI−T3
2.63 V
CAX809ZTBI−T3
2.32 V
CAX810LTBI−T3
4.63 V
CAX810MTBI−T3
4.38 V
CAX810JTBI−T3
4.00 V
CAX810TTBI−T3
3.08 V
CAX810STBI−T3
2.93 V
CAX810RTBI−T3
2.63 V
CAX810ZTBI−T3
2.32 V
Top Mark
(Note 3)
Output
Reset
Package
Quantity per Reel
(Note 4)
VKL
Open
Drain
LOW
SOT−23−3
3,000
VLD
CMOS /
Push−Pull
LOW
SOT−23−3
3,000
VHT
CMOS /
Push−Pull
HIGH
SOT−23−3
3,000
3. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents.
4. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
5. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
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CAX803/D