CAT811, CAT812
4-Pin Microprocessor
Power Supply Supervisors
with Manual Reset
Description
The CAT811 and CAT812 are microprocessor supervisory circuits
that monitor power supplies. The CAT811 and CAT812 are direct
replacements for the MAX811 and MAX812 in applications operating
over the industrial temperature range; both have 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) and
the CAT812 features a RESET push−pull 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 CAT811/812 are fully specified over the industrial temperature
range (−40°C to 85°C) and are available in a compact 4−pin SOT−143
package.
Features
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SOT−143
BI SUFFIX
CASE 527AF
PIN CONFIGURATION
1
GND
2
RESET
(Top View)
3
MR
4
V
CC
•
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
•
Manual Reset Input
•
Offered in Two Output Configurations: CAT811: Active LOW Reset
CAT812: Active HIGH Reset
•
Direct Replacements for the MAX811 and MAX812 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
Applications
MARKING DIAGRAM
XXXMG
G
1
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.
•
•
•
•
•
•
Computers, Servers, Laptops and Cable Modems
Wireless Communications
Embedded Control Systems
White Goods, Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
1
Publication Order Number:
CAT811/D
©
Semiconductor Components Industries, LLC, 2012
October, 2012
−
Rev. 2
CAT811, CAT812
Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION
Nominal Threshold Voltage
4.63 V
4.38 V
4.00 V
3.08 V
2.93 V
2.63 V
2.32 V
Threshold Suffix Designation
L
M
J
T
S
R
Z
Table 2. PIN DESCRIPTION
Pin Number
CAT811
1
2
−
3
CAT812
1
−
2
3
Pin Name
GND
RESET
RESET
MR
Ground.
Active LOW reset. RESET is asserted if V
CC
falls below the reset threshold and re-
mains 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 re-
mains high 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 resistor. The input should be left open if not used.
Power supply voltage that is monitored.
Description
4
4
V
CC
MR
V
CC
V
CC
TOLERANCE
BIAS
+
–
VOLTAGE
REFERENCE
RESET
&
DIGITAL
DELAY
V
CC
RESET
CAT811
GND
MR
V
CC
V
CC
TOLERANCE
BIAS
+
–
VOLTAGE
REFERENCE
RESET
&
DIGITAL
DELAY
V
CC
RESET
CAT812
GND
Figure 1. Block Diagrams
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CAT811, CAT812
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameters
Any pin with respect to ground
Input Current, V
CC
Output Current RESET, 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 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.
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/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.)
Parameter
V
CC
Range
Supply Current
I
CC
V
TH
Symbol
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
V
CC
< 3.6 V, R/S/T/Z
Reset Threshold
Voltage
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
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
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
400
2.32
2.63
2.93
3.08
4.00
4.38
Min
1.0
1.2
8
6
4.63
Typ
Max
5.5
5.5
20
15
4.70
4.75
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
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; RESET output for the CAT812.
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CAT811, CAT812
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/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.)
Parameter
RESET Output
Voltage Low
(Push−pull, active
LOW, CAT811)
RESET Output
Voltage High
(Push−pull, active
LOW, CAT811)
RESET Output
Voltage Low
(Push−pull, active
HIGH, CAT812)
RESET Output
Voltage High
(Push−pull active
HIGH, CAT812)
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; RESET output for the CAT812.
10
20
V
CC
> V
IH (MAX)
, CAT811/812R/S/T/Z
0.7V
CC
0.25V
CC
75
kW
Symbol
V
OL
Conditions
V
CC
= V
TH min
, I
SINK
= 1.2 mA CAT811R/S/T/Z
V
CC
= V
TH min
, I
SINK
= 3.2 mA CAT811J/L/M
V
CC
> 1.0 V, I
SINK
= 50
mA
V
OH
V
CC
= V
TH max
, I
SOURCE
= 500
mA
CAT811R/S/T/Z
V
CC
= V
TH max
, I
SOURCE
= 800
mA
CAT811J/L/M
V
OL
V
CC
> V
TH max
, I
SINK
= 1.2 mA CAT812R/S/T/Z
V
CC
> V
TH max
, I
SINK
= 3.2 mA CAT812J/L/M
V
OH
1.8 V < V
CC
≤
V
TH min
, I
SOURCE
= 150
mA
0.8V
CC
0.8V
CC
V
CC
−
1.5
0.3
0.4
V
Min
Typ
Max
0.3
0.4
0.3
V
V
V
Units
V
t
MR
(Note 2)
(Note 3)
V
CC
> V
TH (MAX)
, CAT811/812L/M/J
10
100
0.5
2.3V
0.8
ms
ns
ms
V
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CAT811, CAT812
(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/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.)
260
POWER−UP RESET TIMEOUT (ms)
240
V
CC
= 5 V
220
V
CC
= 2.5 V
200
180
160
−50
12
10
V
CC
= 5.5 V
8
6
4
2
0
−50
V
CC
= 3.6 V
TYPICAL OPERATING CHARACTERISTICS
0
50
TEMPERATURE (°C)
100
150
SUPPLY CURRENT (mA)
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, CAT8xxR/S/T/Z)
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 4. Power−Down Reset Delay vs.
Temperature (CAT8xxR/S/T/Z)
Figure 5. Normalized Reset Threshold vs.
Temperature
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