1
CAT809, CAT810
3-Pin Microprocessor Power Supply Supervisors
FEATURES
s
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
s
Offered in two output configurations:
- CAT809: Active LOW reset
- CAT810: Active HIGH reset
s
Direct replacements for the MAX809 and
MAX810 in applications operating over the
industrial temperature range
s
Reset valid down to V
CC
= 1.0 V
s
6
A power supply current
s
Power supply transient immunity
s
Compact 3-pin SOT23 and SC70 packages
s
Industrial temperature range: -40C to +85C
2004 by Catalyst Semiconductor, Inc., Patent Pending
Characteristics subject to change without notice
Doc. No. 3004, Rev. S
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
DESCRIPTION
The CAT809 and CAT810 are
P supervisory circuits
that monitor power supplies in digital systems. The
CAT809 and CAT810 are direct replacements for the
MAX809 and MAX810 in applications operating over the
industrial temperature range.
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 CAT809 features a
RESET
push-pull output (active
LOW) and the CAT810 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 CAT809/810 are fully specified over the industrial
temperature range (-40C to 85C) and are available in
compact 3-pin SOT23 and SC70 packages.
PIN CONFIGURATION
CAT809
(CAT810)
GND
RESET
(RESET)
VCC
3-Lead SOT23
3-Lead SC70
1
2
3
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Threshold Suffix
Voltage
Designation
4.63V
L
4.38V
M
4.00V
J
3.08V
T
2.93V
S
2.63V
R
2.32V
Z
HA
LOGEN FREE
TM
LEAD FREE
2
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
ORDERING INFORMATION
Insert threshold suffix (L, M, J, T, S, R or Z) into the blank position. Example: CAT809LTBI-T for 4.63 V.
TOP MARKING
Where YM stands for Year and Month for the SOT23 package and the blank is replaced by the assembly location for the SC70 package.
3
2
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B
D
_
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B
A
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_
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9
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3
CAT809, CAT810
Patent Pending
Doc. No. 3004, Rev. S
PIN DESCRIPTIONS
Pin Number
CAT809
CAT810
1
1
GND
Ground
2
--
RESET
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.
--
2
RESET
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.
3
3
V
CC
Power supply voltage that is monitored.
Name Description
4
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
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/
s
Continuous Power Dissipation
Derate 2.2mW/C above 70C (SC70) ......... 175 mW
Derate 4mW/C above 70C (SOT23) ......... 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
= +25C 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
Symbol
Conditions
Min
Typ
Max
Units
VCC Range
T
A
= 0C to +70C
1.0
5.5
T
A
= -40C to +85C
1.2
5.5
V
CC
< 5.5 V, J/L/M
8
20
V
CC
< 3.6 V, R/S/T/Z
6
15
T
A
= +25C
4.56
4.63
4.70
T
A
= -40C to +85C
4.50
4.75
T
A
= +25C
4.31
4.38
4.45
T
A
= -40C to +85C
4.25
4.50
T
A
= +25C
3.93
4.00
4.06
T
A
= -40C to +85C
3.89
4.10
T
A
= +25C
3.04
3.08
3.11
T
A
= -40C to +85C
3.00
3.15
T
A
= +25C
2.89
2.93
2.96
T
A
= -40C to +85C
2.85
3.00
T
A
= +25C
2.59
2.63
2.66
T
A
= -40C to +85C
2.55
2.70
T
A
= +25C
2.28
2.32
2.35
T
A
= -40C to +85C
2.25
2.38
T
A
= -40C to +85C
Supply Current
I
CC
V
A
L Threshold
M Threshold
J Threshold
T Threshold
S Threshold
R Threshold
Z Threshold
V
Reset
Threshold
Voltage
V
TH
5
CAT809, CAT810
Patent Pending
Doc. No. 3004, Rev. S
ELECTRICAL CHARACTERISTICS
V
CC
= Full range, T
A
= -40C to +85C unless otherwise noted. Typical values at T
A
= +25C 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
Symbol
Conditions
Min
Typ
(1)
Max
Units
Reset Threshold Tempco
30
ppm/C
V
CC
to Reset Delay (Note 2)
V
CC
= V
TH
to (V
TH
- 100 mV)
20
s
Reset Active Timeout Period
T
A
= -40C to +85C
140
240
400
ms
V
CC
= V
TH
min, I
SINK
= 1.2 mA
CAT809R/S/T/Z
V
CC
= V
TH
min, I
SINK
= 3.2 mA
CAT809J/L/M
V
CC
> 1.0 V, I
SINK
= 50
A
0.3
V
CC
= V
TH
max, I
SOURCE
= 500
A
CAT809R/S/T/Z
V
CC
= V
TH
max, I
SOURCE
= 800
A
CAT809J/L/M
V
CC
> V
TH
max, I
SINK
= 1.2 mA
CAT810R/S/T/Z
V
CC
> V
TH
max, I
SINK
= 3.2 mA
CAT810J/L/M
(continued)
Note 1: Production testing done at T
A
= +25C; limits over temperature guaranteed by design only.
Note 2:
RESET
output for the CAT809; RESET output for the CAT810
V
OL
0.4
V
V
V
OH
RESET
Output Voltage High
(Push-pull, active LOW,
CAT809)
V
OL
RESET Output Voltage Low
(Push-pull, active HIGH,
CAT810)
V
V
OH
1.8 V < V
CC
V
TH
min, I
SOURCE
= 150
A
0.8 V
CC
0.8 V
CC
V
CC
- 1.5
V
RESET
Output Voltage Low
(Push-pull, active LOW,
CAT809)
0.4
RESET Output Voltage High
(Push-pull active HIGH,
CAT810)
0.3
0.3
6
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
TYPICAL OPERATING CHARACTERISTICS
V
CC
= Full range, T
A
= -40C to +85C unless otherwise noted. Typical values at T
A
= +25C 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.
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
12
10
8
6
4
2
0
-50 0 50 100 150
SUPPL
Y CURRENT (
A)
TEMPERATURE (C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
14
12
10
8
6
4
2
0
POWER-DOWN RESET DELA
Y (
S)
TEMPERATURE (C)
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
260
240
220
200
180
160
POWER-UP RESET TIMEOUT (mS)
TEMPERATURE (C)
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
NORMALIZED THRESHOLD
TEMPERATURE (C)
VCC=3.6V
VCC=5.5V
-50 0 50 100 150
VCC=5V
VCC=2.5V
-50 0 50 100 150
7
CAT809, CAT810
Patent Pending
Doc. No. 3004, Rev. S
DETAILED DESCRIPTIONS
RESET TIMING
The reset signal is asserted LOW for the CAT809 and HIGH for the CAT810 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.
V
CC
TRANSIENT RESPONSE
The CAT809/810 protect
Ps against brownout failure. Short duration transients of 4
sec or less and 100 mV
amplitude typically do not cause a false RESET.
Figure 2 shows the maximum pulse duration of negative-going V
CC
transients that do not cause a reset condition. As
the amplitude of the transient goes further below the threshold (increasing V
TH
- V
CC
), the maximum pulse duration
decreases. In this test, the V
CC
starts from an initial voltage of 0.5V above the threshold and drops below it by the
amplitude of the overdrive voltage (V
TH
- V
CC
).
5V
0V
5V
0V
5V
0V
CAT809
CAT810
Threshold
Voltage
140ms
minimum
Reset Timeout Period
Power
Supply
Voltage
RESET
RESET
FIGURE 1. RESET TIMING DIAGRAM
FIGURE 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
30
25
20
15
10
5
0
TRANSIENT DURA
TION [
s)
RESET OVERDRIVE VTH - VCC [mV]
1 10 100 1000
TAMB = 25
C
CAT809M
CAT809Z
8
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
VALID RESET WITH V
CC
UNDER 1.0 V
To ensure that the CAT809
RESET
pin is in a known state when V
CC
is under 1.0 V, a 100 k
pull-down resistor
between
RESET
pin and GND is recommended; the value is not critical. For the CAT810, a pull-up resistor from
RESET pin to V
CC
is needed.
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT809/810 can interface with
P/
C bi-directional reset pins by connecting a 4.7 k
resistor in series with the
CAT809/810 reset output and the
P/
C bi-directional reset pin.
CAT809
GND
VCC
100k
Power
Supply
RESET
CAT810
GND
VCC
100k
Power
Supply
RESET
FIGURE 3.
RESET
RESET
RESET
RESET
RESET
Valid with VCC Under 1.0 V
FIGURE 4. RESET Valid with VCC Under 1.1 V
FIGURE 5. Bi-directional Reset Pin Interfacing
CAT809
GND
VCC
4.7k
Power
Supply
RESET
Buffered
RESET
BUF
RESET
INPUT
GND
Bi-directional I/O Pin
P
(For example: 68HC11)
9
CAT809, CAT810
Patent Pending
Doc. No. 3004, Rev. S
OTHER SUPERVISORY PRODUCTS
Function
CAT1161/3
CAT1162
CAT809
CAT810
CAT811
CAT812
With 16k Bit Serial EEPROM Memory
Watchdog Timer
Manual Reset Input
Active Low Reset
Active High Reset
Dual Polarity Reset Outputs
Package
8-pin
8-pin
3-pin
3-pin
4-pin
4-pin
DIP and SOIC
DIP and SOIC
SOT23 and
SOT23 and
SOT143
SOT143
SC70
SC70
10
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
PACKAGE INFORMATION
Plastic SOT-23 (3-Pin)
Inches
Millimeters
Min
Max
Min
Max
Plastic SOT-23 (3-Pin)
A
0.0350
0.0441
0.89
1.12
A1
0.0005
0.0039
0.013
0.10
B
0.0146
0.0197
0.37
0.50
c
0.0033
0.0071
0.085
0.18
D
0.1102
0.1197
2.80
3.04
E
0.0472
0.0551
1.20
1.40
e
0.0350
0.0406
0.89
1.03
e1
0.0701
0.0807
1.78
2.05
H
0.0827
0.1039
2.10
2.64
0
8
0
8
L
0.0083
0.0161
0.275
0.41
L1
0.0160
0.0270
0.275
0.685
NOTE:
1. THIS PART IS COMPLIANT WITH JEDEC
SPECIFICATION TO-236AB
2. DIE IS FACE UP FOR MOLD AND TRIM/FORM
3. DIMENSIONS ARE EXCLUSIVE OF MOLD
FLASH AND METAL BURR
B
H
E
e1
A1
A
D
E
c
L
e
L1
11
CAT809, CAT810
Patent Pending
Doc. No. 3004, Rev. S
PACKAGE INFORMATION
SC-70 Package (3-Lead)
e
b
E1
E
3
2
1
c
L1
L
E
A2
A
A1
D
Inches
Millimeters
Min
Max
Min
Max
Plastic SC-70 (3-Pin)
A
0.0315
0.0433
0.80
1.10
A1
0.0000
0.0039
0.00
0.10
A2
0.0315
0.0394
0.80
1.00
b
0.0059
0.00118
0.15
0.30
c
0.0035
0.0071
0.09
0.18
D
0.0709
0.0866
1.80
2.20
E
0.0453
0.0531
1.15
1.35
E1
0.0709
0.0945
1.80
2.40
e
0.00255 BSC
0.65BSC
L
0.0102
0.0181
0.26
0.46
L1
0.0108
0.0226
0.275
0.575
NOTE:
1. THIS PART IS COMPLIANT WITH EIAJ
SPECIFICATION SC-70
2. DIE IS FACE UP FOR MOLD. DIE IS FACING
DOWN FOR TRIM/FORM
3. DIMENSIONS ARE EXCLUSIVE OF MOLD
FLASH AND METAL BURR
12
CAT809, CAT810
Doc. No. 3004, Rev. S
Patent Pending
REVISION HISTORY
Date
Rev.
Reason
10/29/2003
N
Updated VCC Transient Response text and Figure 2
10/30/2003
O
Updated Power Up Reset Timeout vs. Temperature curve
3/10/2004
P
Corrected temperature range
Updated Description
Updated Ordering Information
Updated Absolute Maximum Ratings
Updated Electrical Characteristics
03/23/2004
Q
Updated Description
Updated Ordering Information
Updated Absolute Maximum Ratings
Updated Electrical Characteristics
Updated Typical Operating Characteristics
Updated Package Information
3/25/2004
R
Changed Preliminary designation to Final
Updated Max Reset Active Timout Period in Electrical Characteristics
Updated package drawings
5/10/2004
S
Updated top marking table
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Publication #:
3004
Revison:
S
Issue date:
5/10/04
Patent Pending
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