CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors with Manual Reset
FEATURES
s
Precision monitoring of
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, 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 +5.0 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 V
cc
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 SOT143 package.
+5.0 V (
±
5%,
±
10%,
±
20%),
+3.3 V (
±
5%,
±
10%),
+3.0 V (
±
10%) and
+2.5 V (
±
5%) power supplies
s
Manual reset input
s
Offered in two output configurations:
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
s
Direct replacements for the MAX811 and
MAX812 in applications operating over the
industrial temperature range
s
Reset valid down to V
CC
= 1.0 V
s
6
µ
A power supply current
s
Power supply transient immunity
s
Available in SOT-143 packages with Sn or
NiPdAu Green Lead finishes.
s
Industrial temperature range: -40°C to +85°C
°
°
APPLICATIONS
s
Computers
s
Servers
s
Laptops
s
Cable modems
s
Wireless communications
s
Embedded control systems
s
White goods
s
Power meters
s
Intelligent instruments
s
PDAs and handheld equipment
THRESHOLD SUFFIX SELECTOR
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
1
PIN CONFIGURATION
GND
1
CAT811
CAT812
4
VCC
RESET
2
3
MR
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 3005, Rev. R
CAT811, CAT812
ORDERING INFORMATION
Prefix
CAT
Company ID
Device Type
811: Push-Pull / Active Low Output
812: Push-Pull / Active High Output
The device shown in the examples (CAT811STBI-
GT10) has an Active Low, Push-Pull output; a trip level
of 2.85V to 3.00V and is provided in the Green SOT-23
package with a NiPdAu lead finish on tape and reel
with 10,000 units.
* NiPdAu is a Lead Finish Option on the Green
Packages only. Unless indicated with the “G” green
packages are shipped with a Sn Matte Lead Finish.
Device #
811
Suffix
S
Trip Level
L: 4.63V
M: 4.38V
J: 4.00V
T: 3.08V
S: 2.93V
R: 2.63V
Z: 2.32V
TBI
Package Type
EUS: 4 pin SOT-143
TBI: 4 pin SOT-143 Green
Parts per Reel
T3: 3K units
T10: 10K units
GT3: 3K units (NiPdAu Lead Finish)*
GT10: 10K units (NiPdAu Lead Finish)*
GT10
TOP MARKING
Parts and
Threshold
CAT811L
CAT811M
CAT811J
CAT811T
CAT811S
CAT811R
CAT811Z
CAT812L
CAT812M
CAT812J
CAT812T
CAT812S
CAT812R
CAT812Z
SOT-143
Green Sn
Matte Lead
Finish
(1) (2)
DHYM
DJYM
CKYM
DLYM
DMYM
DNYM
CPYM
DRYM
DTYM
DUYM
DVYM
DWYM
DXYM
CYYM
SOT-143
Green
NiPdAu Lead
Finish
(1) (2)
SOT-143
(1)
AMYM
ANYM
AZYM
APYM
AQYM
ARYM
AYYM
ASYM
ATYM
AUYM
AVYM
AWYM
AXYM
CIYM
ERYM
ESYM
Notes
1) The “YM” in the SOT-143 package marking indicates the Year
and Month of production.
2) All NiPdAu devices will be marked to indicate product type and
package. Threshold and full part numbers will be provided on box
and reel labels as well as all Shipping documents.
PIN DESCRIPTIONS
Pin Number
CAT811
1
2
—
CAT812
1
—
2
GND
RESET
RESET
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
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.
2
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Name
Description
3
3
MR
4
Doc. No. 3005, Rev. R
4
V
CC
CAT811, CAT812
ABSOLUTE MAXIMUM RATINGS*
Any pin with respect to ground .......... -0.3 V to +6.0 V
Input Current, V
CC
............................................. 20 mA
Output Current, RESET,
RESET ......................
20 mA
Rate of Rise, V
CC .............................................................
100 V/µs
Continuous Power Dissipation
Derate 4mW/°C above 70°C (SOT143) ........ 320 mW
Operating Temperature Range ........... -40°C to +85°C
Storage Temperature Range ............ -65°C to +105°C
Lead Soldering Temperature (10 sec) .............. 300°C
*COMMENT
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.
ELECTRICAL 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
VCC 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, J/L/M
V
CC
< 3.6 V, 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
S Threshold
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
Units
V
µA
L Threshold
M Threshold
J Threshold
Reset
Threshold
Voltage
V
TH
T Threshold
V
R Threshold
Z Threshold
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc No. 3005, Rev. R
CAT811, CAT812
ELECTRICAL 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
= 5 V for
L/M/J versions, V
CC
= 3.3 V for T/S versions, V
CC
= 3 V for R version and V
CC
= 2.5 V for Z version.
Parameter
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timeout Period
V
CC
= V
TH
to (V
TH
- 100 mV)
T
A
= -40˚C to +85˚C
V
CC
= V
TH
min, I
SINK
= 1.2 mA
RESET
Output Voltage Low
(Push-pull, active LOW,
CAT811)
CAT811R/S/T/Z
V
OL
V
CC
= V
TH
min, I
SINK
= 3.2 mA
CAT811J/L/M
V
CC
> 1.0 V, I
SINK
= 50
µA
V
CC
= V
TH
max, I
SOURCE
= 500
µA
RESET
Output Voltage High
(Push-pull, active LOW,
CAT811)
V
OH
CAT811R/S/T/Z
V
CC
= V
TH
max, I
SOURCE
= 800
µA
CAT811J/L/M
V
CC
> V
TH
max, I
SINK
= 1.2 mA
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
t
MD
V
IH
MR
Input Threshold
V
IL
V
IH
V
IL
MR
Pull-up Resistance
Note 1: Production testing done at T
A
= +25˚C; limits over temperature guaranteed by design only.
Note 2:
RESET
output for the CAT811; RESET output for the CAT812
Note 3: Glitches of 100 ns or less typically will not generate a reset pulse.
Symbol
Conditions
Min
Typ
(1)
30
20
Max
Units
ppm/˚C
µs
140
240
400
0.3
ms
0.4
0.3
0.8 V
CC
V
V
V
CC
- 1.5
0.3
V
0.4
CAT812R/S/T/Z
V
OL
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
µA
0.8 V
CC
V
t
MR
Note 3
10
100
µs
ns
µs
Note 2
V
CC
> V
TH (MAX)
, CAT811/812L/M/J
2.3 V
0.5
0.8
V
V
CC
> V
IH (MAX)
, CAT811/812R/S/T/Z
0.7V
CC
0.25V
CC
10
20
30
kΩ
Doc. No. 3005, Rev. R
4
© 2005 by Catalyst Semiconductor, Inc.
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
= 5 V for
L/M/J versions, V
CC
=3.3 V for T/S versions, V
CC
= 3 V for R version and V
CC
= 2.5 V for Z version.
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
12
VCC=5.5V
POWER-UP RESET TIMEOUT (mS)
260
SUPPLY CURRENT (µA)
240
220
200
VCC=5V
10
8
6
4
2
0
VCC=3.6V
VCC=2.5V
180
160
-50
0
50
100
150
-50
0
50
100
150
TEMPERATURE (˚C)
TEMPERATURE (˚C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
1.0002
POWER-DOWN RESET DELAY (µS)
14
NORMALIZED THRESHOLD
0
50
100
150
12
10
8
6
4
2
0
-50
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0
20
40
60
80
100
120
TEMPERATURE (˚C)
TEMPERATURE (˚C)
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 3005, Rev. R
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
