CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
with Manual Reset
FEATURES
DESCRIPTION
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 VCC = 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
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 140ms after the
power supply level has risen above that level. The
2(TM)
used by
underlying floating gate technology, AE
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.
APPLICATION
Computers, Servers, Laptops
Cable modems
Wireless communications
Embedded control systems
White goods
Power meters
Intelligent instruments
PDAs and handheld equipment
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.
PIN CONFIGURATION
THRESHOLD SUFFIX SELECTOR
DESCRIPTION
Nominal Threshold
Voltage
Threshold Suffix
Designation
4.63V
4.38V
4.00V
L
M
J
3.08V
2.93V
2.63V
T
S
R
2.32V
Z
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
GND
1
4
VCC
3
¯¯¯
MR
CAT811
CAT812
¯¯¯¯¯¯
RESET
1
2
Doc. No. MD-3005 Rev. S
CAT811, CAT812
PIN DESCRIPTION
Pin Number
CAT811 CAT812
Name
Description
Ground
¯¯¯¯¯¯ is asserted if VCC falls below the reset threshold
Active LOW reset. RESET
and remains low for at least 140ms after VCC rises above the reset threshold.
Active HIGH reset. RESET is asserted if VCC falls below the reset threshold
and remains high for at least 140ms after VCC 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 140ms after ¯¯¯
MR returns HIGH. The
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.
1
1
GND
2
—
¯¯¯¯¯¯
RESET
—
2
RESET
3
3
¯¯¯
MR
4
4
VCC
BLOCK DIAGRAM
VCC
MR
VCC
VCC
TOLERANCE
BIAS
RESET
&
DIGITAL
DELAY
+
–
RESET
VOLTAGE
REFERENCE
CAT811
GND
VCC
MR
VCC
VCC
TOLERANCE
BIAS
RESET
&
DIGITAL
DELAY
+
–
RESET
VOLTAGE
REFERENCE
CAT812
GND
Doc. No. MD-3005 Rev. S
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT811, CAT812
ABSOLUTE MAXIMUM RATINGS (1)
Parameters
Ratings
Units
-0.3 to + 6.0
V
Input Current, VCC
20
mA
¯¯¯¯¯¯
Output Current RESET, RESET
20
mA
Rate of Raise, VCC
100
V/µs
320
mW
Storage Temperature
-65 to +105
ºC
Operating Ambient Temperature
-40 to +85
ºC
+300
ºC
Any pin with respect to ground
Continuous Power Dissipations
Derate 4mW/ºC above +70ºC (SOT-143)
Lead Soldering (10 seconds)
ELECTRICAL OPERATING CHARACTERISTICS
VCC = Full range, TA = -40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5V for the
L/M/J versions, VCC = 3.3V for the T/S versions, VCC = 3V for the R version and VCC = 2.5V for the Z version.
Parameter
Symbol
VCC Range
Supply Current
ICC
Conditions
Max
1.0
5.5
TA = -40°C to +85°C
1.2
5.5
TA = -40˚C to +85˚C
M Threshold
J Threshold
VTH
Typ
TA = 0°C to +70°C
L Threshold
Reset
Threshold
Voltage
Min
T Threshold
S Threshold
R Threshold
Z Threshold
VCC < 5.5V, J/L/M
8
20
VCC < 3.6V, R/S/T/Z
6
15
4.63
4.70
TA = +25°C
4.56
TA = -40°C to +85°C
4.50
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
Units
V
µA
4.75
4.38
4.45
4.50
4.00
4.06
4.10
3.08
3.11
3.15
2.93
V
2.96
3.00
2.63
2.66
2.70
2.32
2.35
2.38
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.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-3005 Rev. S
CAT811, CAT812
ELECTRICAL OPERATING CHARACTERISTICS (continued)
VCC = Full range, TA = -40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5V for the
L/M/J versions, VCC = 3.3V for the T/S versions, VCC = 3V for the R version and VCC = 2.5V for the Z version.
Parameter
Symbol
Conditions
Min
Reset Threshold
Tempco
VCC to Reset
Delay(2)
VCC = VTH to (VTH - 100mV)
Reset Active
Timeout Period
TA = -40˚C to +85˚C
¯¯¯¯¯¯ Output
RESET
Voltage Low
(Push-pull, active
LOW, CAT811)
¯¯¯¯¯¯ Output
RESET
Voltage High
(Push-pull, active
LOW, CAT811)
VOL
VOH
RESET Output
Voltage Low
(Push-pull, active
HIGH, CAT812)
VOL
RESET Output
Voltage High
(Push-pull active
HIGH, CAT812)
VOH
¯¯¯
MR Minimum
Pulse Width
¯¯¯
MR Glitch
Immunity
¯¯¯
MR to RESET
Propagation Delay
¯¯¯
MR Input
Threshold
140
Typ (1)
Max
30
ppm/˚C
20
µs
240
400
VCC = VTH min, ISINK = 1.2mA
CAT811R/S/T/Z
0.3
VCC = VTH min, ISINK = 3.2mA
CAT811J/L/M
0.4
VCC > 1.0V, ISINK = 50µA
0.3
VCC = VTH max, ISOURCE = 500µA
CAT811R/S/T/Z
0.8VCC
VCC = VTH max, ISOURCE = 800µA
CAT811J/L/M
VCC - 1.5
ms
V
V
VCC > VTH max, ISINK = 1.2mA
CAT812R/S/T/Z
0.3
VCC > VTH max, ISINK = 3.2mA
CAT812J/L/M
0.4
1.8 V < VCC ≤ VTH min,
ISOURCE = 150µA
Units
V
0.8VCC
V
10
µs
tMR
Note 3
100
ns
tMD
Note 2
0.5
µs
VIH
VCC > VTH (MAX), CAT811/812L/M/J
2.3V
VIL
VIH
0.8
VCC > VIH (MAX), CAT811/812R/S/T/Z
V
0.7VCC
VIL
0.25VCC
¯¯¯
MR Pull-up
Resistance
10
20
30
kΩ
Notes:
(1) Production testing done at TA = +25˚C; limits over temperature guaranteed by design only.
¯¯¯¯¯¯ output for the CAT811; RESET output for the CAT812
(2) RESET
(3) Glitches of 100ns or less typically will not generate a reset pulse
Doc. No. MD-3005 Rev. S
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT811, CAT812
TYPICAL OPERATING CHARACTERISTICS
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
260
12
240
SUPPLY CURRENT (µA)
POWER-UP RESET TIMEOUT (ms)
VCC = Full range, TA = -40°C to +85°C unless otherwise noted. Typical values at TA = +25°C and VCC = 5V for the
L/M/J versions, VCC = 3.3V for the T/S versions, VCC = 3V for the R version and VCC = 2.5V for the Z version.
VCC=5V
220
200
VCC=2.5V
180
VCC=5.5V
10
8
VCC=3.6V
6
4
2
0
160
-50
0
50
100
-50
150
0
TEMPERATURE (°C)
150
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
1.0002
14
NORMALIZED THRESHOLD
POWER-DOWN RESET DELAY (s)
100
TEMPERATURE (°C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
12
10
8
6
4
2
0
-50
50
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0
50
100
150
0
TEMPERATURE (°C)
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
20
40
60
80
100
120
TEMPERATURE (°C)
5
Doc. No. MD-3005 Rev. S
CAT811, CAT812
DETAILED DESCRIPTION
RESET TIMING
The reset signal is asserted LOW for the CAT811 and
HIGH for the CAT812 when the power supply voltage
falls below the threshold trip voltage and remains
asserted for at least 140ms after the power supply
voltage has risen above the threshold.
Threshold
Voltage
Power 5V
Supply
Voltage 0V
Reset Timeout Period
140ms
minimum
5V
RESET
CAT811
0V
5V
RESET
CAT812
0V
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE
The CAT811/812 protect µPs against brownout
failure. Short duration transients of 4µs or less and
100mV amplitude typically do not cause a false
RESET.
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 0.5V above the threshold and
drops below it by the amplitude of the overdrive
voltage (VTH - VCC).
Figure 2 shows the maximum pulse duration of
negative-going VCC transients that do not cause a
reset condition.
TRANSIENT DURATION (s)
30
TAMB = 25°C
25
20
15
CAT8xxZ
10
5
0
CAT8xxM
1
10
100
1000
RESET OVERDRIVE VTH - VCC (mV)
Figure 2. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
Doc. No. MD-3005 Rev. S
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT811, CAT812
VALID RESET WITH VCC UNDER 1.0V
¯¯¯¯¯¯ pin is in a known
To ensure that the CAT811 RESET
state when VCC is under 1.0V, a 100kΩ pull-down
¯¯¯¯¯¯ pin and GND is
resistor between RESET
recommended; the value is not critical. For the
CAT812, a pull-up resistor from RESET pin to VCC is
needed.
Power
Supply
Power
Supply
VCC
VCC
100kΩ
CAT811
MR
CAT812
RESET
GND
MR
100kΩ
RESET
GND
Figure 4. RESET Valid with VCC under 1.1V
¯¯¯¯¯¯ Valid with VCC under 1.0V
Figure 3. RESET
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT811/812 can interface with µP/µC bidirectional reset pins by connecting a 4.7kΩ resistor in
series with the CAT811/812 reset output and the
µP/µC bi-directional reset pin.
BUF
Power
Supply
VCC
CAT811
(for example: 68HC11)
µP
4.7kΩ
MR
Buffered
RESET
RESET
RESET
INPUT
GND
CAT811
GND
Bi-directional I/O Pin
Figure 5. Bi-directional Reset Pin Interfacing
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-3005 Rev. S
CAT811, CAT812
OTHER SUPERVISORY PRODUCTS
Function
With 16k Bit Serial EEPROM
Memory
Watchdog Timer
CAT1161/3
CAT1162
CAT809
CAT810
CAT811
CAT812
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
4-pin
SOT-143
Manual Reset Input
Active Low Reset
Active High Reset
Dual Polarity Reset Outputs
Package
Doc. No. MD-3005 Rev. S
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT811, CAT812
PACKAGE OUTLINE DRAWING
SOT-143 4-Lead (TB) (1)
SYMBOL
MIN
NOM
MAX
A
0.80
1.22
D
A1
0.05
0.15
e
A2
0.75
b
0.30
0.50
b2
0.76
0.89
E1
e1
E
c
0.08
D
2.80
E
2.10
E1
1.20
A2
1.30
1.40
2.64
1.92 BSC
0.20 BSC
0.50
L1
0.54 REF
L2
0.25
θ
TOP VIEW
0.20
3.04
e
0.40
0°
0.60
8°
c
θ
A
1.07
2.90
e1
L
b
0.90
L2
L
b1
A1
L1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC satndard TO-253.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. MD-3005 Rev. S
CAT811, CAT812
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
CAT
Device #
811
Suffix
S
Company ID
Product Number
811: Push-Pull/Active Low Output
812: Push-Pull/Active High Output
Trip Level
L: 4.63V
M: 4.38V
J: 4.00V
T: 3.08V
S: 2.93V
R: 2.63V
Z: 2.32V
TB
Package
TB: SOT-143
I
-G
T10
Lead Finish
Blank: Matte-Tin
G: NiPdAu
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
10: 10,000/Reel
Temperature Range
I = Industrial (-40ºC to 85ºC)
For Product Top Mark Codes, click here:
http://www.catsemi.com/techsupport/producttopmark.asp
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2)
The standard lead finish is NiPdAu. Contact factory for other package availability.
(3)
This device used in the above example is a CAT811STBI-GT10 (SOT-143 4-Lead, Push-Pull/Active Low Output, trip level of 2.85V to
3.00V, NiPdAu, Tape & Reel, 10,000/Reel)
(4)
For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. MD-3005 Rev. S
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
10/22/2003
L
Updated Ordering Information
12/22/2003
M
Updated Features Replaced power-up reset timeout vs. temperature graph with updated
one Replaced VCC Transient Response graph with updated one
03/22/2004
N
General data sheet updates
03/25/2004
O
Updated Electrical Characteristics (Reset Active Timeout Period Max)
03/25/2004
P
Corrected Pin Configure diagram
09/28/2004
Q
Minor changes
12/28/2005
R
Updated Features Updated Ordering Information Updated Top Marking
S
Add “MD-“ to document number
Add Block Diagrams
Updated Package Outline Drawing
Update Example of Ordering Information
04/18/2008
Copyrights, Trademarks and Patents
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Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
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Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Catalyst Semiconductor 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 Catalyst Semiconductor product could create a situation where personal
injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled
"Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical
semiconductor applications and may not be complete.
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Corporate Headquarters
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Santa Clara, CA 95054
Phone: 408.542.1000
Fax:
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Document No: MD-3005
Revision:
S
Issue date:
04/18/08
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