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
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SOT−143
BI SUFFIX
CASE 527AF
PIN CONFIGURATION
1
GND
4
V
CC
2
RESET
(Top View)
3
MR
•
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 V
CC
= 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
Computers, Servers, Laptops and Cable Modems
Wireless Communications
Embedded Control Systems
White Goods, Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
MARKING DIAGRAM
XXXMG
G
1
XXX
M
G
= Specific Device Code
= Month Code
= Pb−Free Package
(Note: Microdot may be in either location)
Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
©
Semiconductor Components Industries, LLC, 2015
1
July, 2015 − Rev. 3
Publication Order Number:
CAT811/D
CAT811
Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION
Nominal Threshold Voltage
4.63 V
3.08 V
2.93 V
Threshold Suffix Designation
L
T
S
Table 2. PIN DESCRIPTION
Pin Number
1
2
3
Pin Name
GND
RESET
MR
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.
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.
Power supply voltage that is monitored.
Description
4
V
CC
MR
V
CC
V
CC
TOLERANCE
BIAS
+
–
VOLTAGE
REFERENCE
RESET
&
DIGITAL
DELAY
V
CC
RESET
CAT811
GND
Figure 1. Block Diagrams
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CAT811
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameters
Any pin with respect to ground
Input Current, V
CC
Output Current RESET
Rate of Raise, V
CC
Continuous Power Dissipations
Derate 4 mW/°C above +70°C (SOT−143)
Storage Temperature Range
Operating Ambient Temperature Range
Lead Soldering Temperature (10 seconds)
Ratings
−0.3 to +6.0
20
20
100
320
−65 to +105
−40 to +85
+300
Units
V
mA
mA
V/ms
mW
°C
°C
°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 affected.
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(V
CC
= Full range, T
A
= −40°C to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 5 V for the L version,
V
CC
= 3.3 V for the T/S versions.)
Parameter
V
CC
Range
Symbol
Conditions
T
A
= 0°C to +70°C
T
A
= −40°C to +85°C
Supply Current
I
CC
T
A
= −40°C to +85°C
V
CC
< 5.5 V, L
V
CC
< 3.6 V, S/T
Reset Threshold
Voltage
V
TH
L 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
Reset Threshold
Tempco
V
CC
to Reset Delay
(Note 3)
Reset Active
Timeout Period
V
CC
= V
TH
to (V
TH
− 100 mV)
T
A
= −40°C to +85°C
140
4.56
4.50
3.04
3.00
2.89
2.85
30
20
240
400
2.93
3.08
Min
1.0
1.2
8
6
4.63
Typ
Max
5.5
5.5
20
15
4.70
4.75
3.11
3.15
2.96
3.00
ppm/°C
ms
ms
V
mA
Units
V
1. Production testing done at T
A
= +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.
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CAT811
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(V
CC
= Full range, T
A
= −40°C to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 5 V for the L version,
V
CC
= 3.3 V for the T/S versions.)
Parameter
RESET Output
Voltage Low
(Push−pull, active
LOW, CAT811)
RESET Output
Voltage High
(Push−pull, active
LOW, CAT811)
MR Minimum Pulse
Width
MR Glitch Immunity
MR to RESET
Propagation Delay
MR Input Threshold
t
MD
V
IH
V
IL
V
IH
V
IL
MR Pull−up
Resistance
1. Production testing done at T
A
= +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.
10
20
V
CC
> V
IH (MAX)
, CAT811S/T
0.7V
CC
0.25V
CC
75
kW
Symbol
V
OL
Conditions
V
CC
= V
TH min
, I
SINK
= 1.2 mA CAT811S/T
V
CC
= V
TH min
, I
SINK
= 3.2 mA CAT811L
V
CC
> 1.0 V, I
SINK
= 50
mA
V
OH
V
CC
= V
TH max
, I
SOURCE
= 500
mA
CAT811S/T
V
CC
= V
TH max
, I
SOURCE
= 800
mA
CAT811L
t
MR
(Note 2)
(Note 3)
V
CC
> V
TH (MAX)
, CAT811L
2.3V
0.8
0.8V
CC
V
CC
− 1.5
10
100
0.5
Min
Typ
Max
0.3
0.4
0.3
V
V
ms
ns
ms
V
Units
V
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CAT811
TYPICAL OPERATING CHARACTERISTICS
(V
CC
= Full range, T
A
= −40°C to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 5 V for the L version,
V
CC
= 3.3 V for the T/S versions.)
260
POWER−UP RESET TIMEOUT (ms)
12
10
V
CC
= 5.5 V
8
6
4
2
0
−50
V
CC
= 3.6 V
V
CC
= 5 V
220
V
CC
= 2.5 V
200
180
160
−50
0
50
TEMPERATURE (°C)
100
150
SUPPLY CURRENT (mA)
240
0
50
TEMPERATURE (°C)
100
150
Figure 2. Power−Up Reset Timeout vs.
Temperature
14
POWER−DOWN RESET DELAY (s)
NORMALIZED THRESHOLD
12
10
8
6
4
2
0
−50
0
50
TEMPERATURE (°C)
100
150
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, CAT811S/T)
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 4. Power−Down Reset Delay vs.
Temperature (CAT811S/T)
Figure 5. Normalized Reset Threshold vs.
Temperature
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