CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
FEATURES
s
Precision monitoring of
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Direct replacements for the MAX811 and
+5.0 V (+/- 5%, +/- 10%, +/- 20%),
+3.3 V (+/- 5%, +/ 10%),
+3.0 V (+/- 10%) and
+2.5 V (+/- 5%) power supplies
s
Offered in two output configurations:
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
Compact 4-pin SOT143 package
s
Industrial temperature range: -40˚C to +85˚C
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
s
Manual reset input
APPLICATIONS
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Computers
s
Servers
s
Laptops
s
Cable modems
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Wireless communications
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Embedded control systems
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White goods
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Power meters
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Intelligent instruments
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PDAs and handheld equipment
DESCRIPTION
The CAT811 and CAT812 are
µP
supervisory circuits
that monitor power supplies in digital systems. 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.
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
(RESET)
2
3
© 2004 by Catalyst Semiconductor, Inc., Patent Pending
Characteristics subject to change without notice
Doc. No. 3005, Rev. P
CAT811, CAT812
ORDERING INFORMATION
Ordering Part Number
CAT811_EUS-T
CAT811_EUS-T10
CAT811_TBI-T
CAT811_TBI-T10
CAT812_EUS-T
CAT812_EUS-T10
CAT812_TBI-T
CAT812_TBI-T10
RESET Polarity
Push-Pull
RESET
Push-Pull
RESET
Push-Pull
RESET
Push-Pull
RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Package
4-pin, SOT143
4-pin, SOT143
4-pin, SOT143 Green
4-pin, SOT143 Green
4-pin, SOT143
4-pin, SOT143
4-pin, SOT143 Green
4-pin, SOT143 Green
Parts per Reel
3k
10k
3k
10k
3k
10k
3k
10k
Insert threshold suffix (L, M, J, T, S, R or Z) into the blank position. Example: CAT811LTBI-T for 4.63 V, and lead-free SOT143 package.
TOP MARKING
SOT143
CAT811L
CAT811M
CAT811J
CAT811T
CAT811S
CAT811R
CAT811Z
CAT812L
CAT812M
CAT812J
CAT812T
CAT812S
CAT812R
CAT812Z
Where YM stands for Year and Month.
AMYM
ANYM
AZYM
APYM
AQYM
ARYM
AYYM
ASYM
ATYM
AUYM
AVYM
AWYM
AXYM
CIYM
SOT143 Green
DHYM
DJYM
CKYM
DLYM
DMYM
DNYM
CPYM
DRYM
DTYM
DUYM
DVYM
DWYM
DXYM
CYYM
Doc. No. 3005, Rev. P
2
Patent Pending
CAT811, CAT812
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. It can be driven by TTL or CMOS logic or shorted to ground
by a switch.
Power supply voltage that is monitored.
Name
Description
3
3
MR
4
4
V
CC
Patent Pending
3
Doc. No. 3005, Rev. P
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
J Threshold
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
R Threshold
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
Reset
Threshold
Voltage
V
TH
T Threshold
V
Z Threshold
Doc. No. 3005, Rev. P
4
Patent Pending
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
Patent Pending
5
Doc. No. 3005, Rev. P
微控制器 MCU
