CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
with Manual Reset
FEATURES
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
= 1.0V
6µA power supply current
Power supply transient immunity
Available in SOT-143 packages with Sn or
NiPdAu Green Lead finishes.
Industrial temperature range: -40ºC to +85ºC
DESCRIPTION
The CAT811 and CAT812 are microprocessor supervi-
sory 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 140ms after the
power supply level has risen above that level. The
underlying floating gate technology, AE
2(TM)
used by
Catalyst Semiconductor, makes it possible to offer any
custom reset threshold value. Seven industry
standard threshold levels are offered to support
+5.0V, +3.3V, +3.0V and +2.5V 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.
For Ordering Information details, see page 10.
APPLICATION
Computers, Servers, Laptops
Cable modems
Wireless communications
Embedded control systems
White goods
Power meters
Intelligent instruments
PDAs and handheld equipment
THRESHOLD SUFFIX SELECTOR
DESCRIPTION
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
PIN CONFIGURATION
GND
1
CAT811
CAT812
¯¯¯¯¯¯
RESET
2
3
¯¯¯
MR
4
V
CC
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3005 Rev. V
CAT811, CAT812
PIN DESCRIPTION
Pin Number
CAT811 CAT812
1
2
—
1
—
2
Name
GND
¯¯¯¯¯¯
RESET
RESET
Description
Ground
¯¯¯¯¯¯
Active LOW reset. RESET is asserted if V
CC
falls below the reset threshold
and remains low for at least 140ms 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 140ms after V
CC
rises above the reset
threshold.
Manual Reset Input. A logic LOW on ¯¯¯ asserts RESET. RESET remains
MR
active as long as ¯¯¯ is LOW and for 140ms after ¯¯¯ returns HIGH. The
MR
MR
active low input has an internal 20kΩ pull-up resistor. The input should be
left open if not used.
Power supply voltage that is monitored.
3
4
3
4
¯¯¯
MR
V
CC
BLOCK DIAGRAM
MR
V
CC
TOLERANCE
BIAS
RESET
&
DIGITAL
DELAY
V
CC
V
CC
+
–
RESET
VOLTAGE
REFERENCE
CAT811
GND
MR
V
CC
TOLERANCE
BIAS
RESET
&
DIGITAL
DELAY
V
CC
V
CC
+
–
RESET
VOLTAGE
REFERENCE
CAT812
GND
Doc. No. MD-3005 Rev. V
2
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT811, CAT812
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Any pin with respect to ground
Input Current, V
CC
¯¯¯¯¯¯
Output Current RESET, RESET
Rate of Raise, V
CC
Continuous Power Dissipations
Derate 4mW/ºC above +70ºC (SOT-143)
Storage Temperature
Operating Ambient Temperature
Lead Soldering (10 seconds)
Ratings
-0.3 to + 6.0
20
20
100
320
-65 to +105
-40 to +85
+300
Units
V
mA
mA
V/µs
mW
ºC
ºC
ºC
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
= 5V for the
L/M/J versions, V
CC
= 3.3V for the T/S versions, V
CC
= 3V for the R version and V
CC
= 2.5V for the Z version.
Parameter
V
CC
Range
Supply Current
I
CC
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
M Threshold
J Threshold
Reset
Threshold
Voltage
V
TH
T Threshold
S Threshold
R Threshold
Z Threshold
V
CC
< 5.5V, J/L/M
V
CC
< 3.6V, R/S/T/Z
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
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
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
V
Units
V
µA
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-3005 Rev. V
CAT811, CAT812
ELECTRICAL OPERATING CHARACTERISTICS
(continued)
V
CC
= Full range, T
A
= -40°C to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 5V for the
L/M/J versions, V
CC
= 3.3V for the T/S versions, V
CC
= 3V for the R version and V
CC
= 2.5V for the Z version.
Parameter
Reset Threshold
Tempco
V
CC
to Reset
Delay
(2)
Reset Active
Timeout Period
¯¯¯¯¯¯
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)
¯¯¯ Minimum
MR
Pulse Width
¯¯¯ Glitch
MR
Immunity
¯¯¯ to RESET
MR
Propagation Delay
V
CC
= V
TH
to (V
TH
- 100mV)
T
A
= -40˚C to +85˚C
V
CC
= V
TH min
, I
SINK
= 1.2mA
CAT811R/S/T/Z
V
OL
V
CC
= V
TH min
, I
SINK
= 3.2mA
CAT811J/L/M
V
CC
> 1.0V, I
SINK
= 50µA
V
OH
V
CC
= V
TH max
, I
SOURCE
= 500µA
CAT811R/S/T/Z
V
CC
= V
TH max
, I
SOURCE
= 800µA
CAT811J/L/M
V
CC
> V
TH max
, I
SINK
= 1.2mA
CAT812R/S/T/Z
V
CC
> V
TH max
, I
SINK
= 3.2mA
CAT812J/L/M
1.8 V < V
CC
≤
V
TH min
,
I
SOURCE
= 150µA
0.8V
CC
0.8V
CC
V
V
CC
- 1.5
0.3
V
0.4
140
Symbol
Conditions
Min
Typ
(1)
30
20
240
400
0.3
0.4
0.3
V
Max
Units
ppm/˚C
µs
ms
V
OL
V
OH
V
t
MR
Note 3
t
MD
V
IH
Note 2
V
CC
> V
TH (MAX)
, CAT811/812L/M/J
10
100
0.5
2.3V
0.8
V
CC
> V
IH (MAX)
, CAT811/812R/S/T/Z
0.7V
CC
0.25V
CC
10
20
75
µs
ns
µs
¯¯¯ Input
MR
Threshold
V
IL
V
IH
V
IL
V
¯¯¯ Pull-up
MR
Resistance
kΩ
Notes:
(1) Production testing done at T
A
= +25˚C; limits over temperature guaranteed by design only.
¯¯¯¯¯¯
(2) RESET output for the CAT811; RESET output for the CAT812
(3) Glitches of 100ns or less typically will not generate a reset pulse
Doc. No. MD-3005 Rev. V
4
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT811, CAT812
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
= 5V for the
L/M/J versions, V
CC
= 3.3V for the T/S versions, V
CC
= 3V for the R version and V
CC
= 2.5V for the Z version.
POWER-UP RESET TIMEOUT (ms)
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
260
SUPPLY CURRENT (µA)
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
12
V
CC
=5.5V
240
220
200
V
CC
=5V
10
8
6
4
2
0
V
CC
=3.6V
V
CC
=2.5V
180
160
-50
0
50
100
150
TEMPERATURE (°C)
-50
0
50
100
150
TEMPERATURE (°C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
POWER-DOWN RESET DELAY (s)
NORMALIZED THRESHOLD
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
1.0002
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0
20
40
60
80
100
120
14
12
10
8
6
4
2
0
-50
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3005 Rev. V
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