© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 3 1Publication Order Number:
CAT811/D
CAT811
4-Pin Microprocessor
Power Supply Supervisor
with Manual Reset
Description
The CAT811 is a microprocessor supervisory circuit that monitors
power supplies. The CAT811 is a direct replacement for the MAX811
in applications operating over the industrial temperature range and has
a manual reset input.
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 CAT811
features a RESET push−pull output (active LOW).
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 CAT811 is fully specified over the industrial temperature range
(−40°C to 85°C) and is available in a compact 4−pin SOT−143
package.
Features
•Precision Monitoring of
+5.0 V (± 5%, ± 10%, ± 20%),
+3.3 V (± 5%, ± 10%)
•Manual Reset Input
•Output Configuration: Active LOW Reset
•Direct Replacements for the MAX811 in Applications Operating
over the Industrial Temperature Range
•Reset Valid down to VCC = 1.0 V
•6 mA Power Supply Current
•Power Supply Transient Immunity
•Available in SOT−143 Packages with Sn or NiPdAu Green Lead
Finishes
•Industrial Temperature Range: −40°C to +85°C
•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
•Computers, Servers, Laptops and Cable Modems
•Wireless Communications
•Embedded Control Systems
•White Goods, Power Meters
•Intelligent Instruments
•PDAs and Handheld Equipment
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PIN CONFIGURATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
ORDERING INFORMATION
SOT−143
BI SUFFIX
CASE 527AF
(Top View)
RESET
GND VCC
MR
1
2
4
3
1
MARKING DIAGRAM
XXX = Specific Device Code
M = Month Code
G= Pb−Free Package
(Note: Microdot may be in either location)
XXXMG
G
CAT811
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Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION
Nominal Threshold Voltage Threshold Suffix Designation
4.63 V L
3.08 V T
2.93 V S
Table 2. PIN DESCRIPTION
Pin Number Pin Name Description
1 GND Ground.
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.
3 MR Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains active as long as MR is
LOW and for 140 ms after MR returns HIGH. The active low input has an internal 20 kW pull−up resis-
tor. The input should be left open if not used.
4 VCC Power supply voltage that is monitored.
Figure 1. Block Diagrams
CAT811
+
–
RESET
&
DIGITAL
DELAY
TOLERANCE
BIAS
VOLTAGE
REFERENCE
GND
VCC
VCC
VCC
RESET
MR
CAT811
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Table 3. ABSOLUTE MAXIMUM RATINGS
Parameters Ratings Units
Any pin with respect to ground −0.3 to +6.0 V
Input Current, VCC 20 mA
Output Current RESET 20 mA
Rate of Raise, VCC 100 V/ms
Continuous Power Dissipations
Derate 4 mW/°C above +70°C (SOT−143) 320 mW
Storage Temperature Range −65 to +105 °C
Operating Ambient Temperature Range −40 to +85 °C
Lead Soldering Temperature (10 seconds) +300 °C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be af fected.
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(VCC = Full range, TA = −40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5 V for the L version,
VCC = 3.3 V for the T/S versions.)
Parameter Symbol Conditions Min Typ Max Units
VCC Range TA = 0°C to +70°C 1.0 5.5 V
TA = −40°C to +85°C 1.2 5.5
Supply Current ICC TA = −40°C to +85°CVCC < 5.5 V, L 8 20 mA
VCC < 3.6 V, S/T 6 15
Reset Threshold
Voltage VTH L Threshold TA = +25°C 4.56 4.63 4.70 V
TA = −40°C to +85°C 4.50 4.75
T Threshold TA = +25°C 3.04 3.08 3.11
TA = −40°C to +85°C 3.00 3.15
S Threshold TA = +25°C 2.89 2.93 2.96
TA = −40°C to +85°C 2.85 3.00
Reset Threshold
Tempco 30 ppm/°C
VCC to Reset Delay
(Note 3) VCC = VTH to (VTH − 100 mV) 20 ms
Reset Active
Timeout Period TA = −40°C to +85°C 140 240 400 ms
1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only.
2. Glitches of 100 ns or less typically will not generate a reset pulse.
3. RESET output for the CAT811.
CAT811
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Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(VCC = Full range, TA = −40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5 V for the L version,
VCC = 3.3 V for the T/S versions.)
Parameter UnitsMaxTypMinConditionsSymbol
RESET Output
Voltage Low
(Push−pull, active
LOW, CAT811)
VOL VCC = VTH min, ISINK = 1.2 mA CAT811S/T 0.3 V
VCC = VTH min, ISINK = 3.2 mA CAT811L 0.4
VCC > 1.0 V, ISINK = 50 mA0.3
RESET Output
Voltage High
(Push−pull, active
LOW, CAT811)
VOH VCC = VTH max, ISOURCE = 500 mA CAT811S/T 0.8VCC V
VCC = VTH max, ISOURCE = 800 mA CAT811L VCC − 1.5 V
MR Minimum Pulse
Width tMR 10 ms
MR Glitch Immunity (Note 2) 100 ns
MR to RESET
Propagation Delay tMD (Note 3) 0.5 ms
MR Input Threshold VIH VCC > VTH (MAX), CAT811L 2.3V V
VIL 0.8
VIH VCC > VIH (MAX), CAT811S/T 0.7VCC
VIL 0.25VCC
MR Pull−up
Resistance 10 20 75 kW
1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only.
2. Glitches of 100 ns or less typically will not generate a reset pulse.
3. RESET output for the CAT811.
CAT811
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TYPICAL OPERATING CHARACTERISTICS
(VCC = Full range, TA = −40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5 V for the L version,
VCC = 3.3 V for the T/S versions.)
Figure 2. Power−Up Reset Timeout vs.
Temperature Figure 3. Supply Current vs. Temperature
(No Load, CAT811S/T)
TEMPERATURE (°C) TEMPERATURE (°C)
150100500−50
160
180
200
220
240
260
150100500−50
0
2
4
6
8
10
12
Figure 4. Power−Down Reset Delay vs.
Temperature (CAT811S/T) Figure 5. Normalized Reset Threshold vs.
Temperature
TEMPERATURE (°C) TEMPERATURE (°C)
150100500−50
0
2
4
6
8
10
12
14
120100806040200
0.9988
0.9990
0.9992
0.9994
0.9996
0.9998
1.0000
1.0002
POWER−UP RESET TIMEOUT (ms)
SUPPLY CURRENT (mA)
POWER−DOWN RESET DELAY (s)
NORMALIZED THRESHOLD
VCC = 5 V
VCC = 2.5 V
VCC = 5.5 V
VCC = 3.6 V
CAT811
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DETAILED DESCRIPTION
Reset Timing
The reset signal is asserted LOW for the CAT811 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.
5 V
0 V
5 V
0 V
Threshold
Voltage
140 ms
minimum
Figure 6. Reset Timing Diagram
RESET
0 V
RESET
CAT811
CAT812
Reset
Timeout Period
VCC
VCC
VCC Transient Response
The CAT811 protect mPs against brownout failure. Short
duration transients of 4 ms 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).
Figure 7. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
RESET OVERDRIVE VTH − VCC (mV)
1000100101
0
5
10
15
20
25
30
TRANSIENT DURATION (ms)
CAT811Z
TAMB = 25°C
CAT811M
Valid Reset with VCC under 1.0 V
To ensure that the CAT811 RESET pin is in a known state
when VCC is under 1.0 V, a 100 kW pull−down resistor
between RESET pin and GND is recommended; the value
is not critical.
Figure 8. RESET Valid with VCC Under 1.0 V
GND 100 kW
CAT811
Power
Supply VCC
RESETMR
CAT811
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Bi−directional Reset Pin Interfacing
The CAT811 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the CAT811
reset output and the mP/mC bi−directional reset pin.
Figure 9. Bi−directional Reset Pin Interfacing
GND
4.7 kW
CAT811
CAT811
GND
BUF
INPUT
Power
Supply
(for example: 68HC11)
Buffered
Bi−directional I/O Pin
RESET
VCC
MR RESET RESET
mP
Table 5. OTHER SUPERVISORY PRODUCTS
Function CAT1161/3 CAT1162 CAT809 CAT810 CAT811
With 16k Bit Serial EEPROM Memory a a
Watchdog Timer a
Manual Reset Input a a a
Active Low Reset a a
Active High Reset a
Dual Polarity Reset Outputs a a
Package 8−pin DIP
and SOIC 8−pin DIP
and SOIC 3−pin SOT−23
and SC70 3−pin SOT−23
and SC70 4−pin
SOT−143
CAT811
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PACKAGE DIMENSIONS
SOT−143, 4 Lead
CASE 527AF−01
ISSUE A
E1 E
A1
e
e1 b
b2
D
c
A
A2
TOP VIEW
SIDE VIEW END VIEW
L1
L2
L
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC TO-253.
SYMBOL
θ
MIN NOM MAX
q
0°8°
A
A1
A2
b
b2
c
D
E
e
L
L1
0.05
0.75
0.30
0.76
0.40
0.08
2.80
2.10
1.92 BSC
0.54 REF
1.22
0.15
1.07
0.50
0.89
0.60
0.20
3.04
2.64
0.50
0.90
2.90
e1 0.20 BSC
E1 1.20 1.401.30
L2 0.25
0.80
12
43
CAT811
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ORDERING INFORMATION
Order Number
Voltage
Top Mark (Note 4)
Output Reset Package
Quantity
per Reel
(Note 5)
NiPdAu NiPdAu
CAT811LTBI−GT3 4.63 V VEA
Manual
Reset LOW SOT−143−4 3,000
CAT811MTBI−GT3 4.38 V VEA
CAT811JTBI−GT3 4.00 V VEA
CAT811TTBI−GT3 3.08 V VEA
CAT811STBI−GT3 2.93 V VEA
CAT811RTBI−GT3 2.63 V VEA
CAT811ZTBI−GT3 2.32 V VEA
4. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents.
5. 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.
6. 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 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 does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, af filiates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
CAT811/D
P
UBLICATION ORDERING INFORMATION
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USA/Canada
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Phone: 421 33 790 2910
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Phone: 81−3−5817−1050
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Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
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