1
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
Doc. No. MD-3004, Rev. Z
CAT803, CAT809, CAT810
3-Pin Microprocessor Power Supply Supervisors
FEATURES
Precision monitoring of
+5.0V (-5%, -10%, -20%),
+3.3V (-5%, -10%),
+3.0V (-10%) and
+2.5V (-5%) power supplies






industrial temperature range
Reset valid down to VCC = 1.0V
6µA power supply current
Power supply transient immunity


packages

Computers
Servers

Cable modems

Embedded control systems

Power meters

ndheld equipment
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■

The CAT803, CAT809, and CAT810 are supervisory
circuits that monitor power supplies in digital systems. The
CAT803, CAT809, and CAT810 are direct replacements
for the MAX803, 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 oating gate
technology, AE2(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 CAT803 has an open-drain RESET output (active
LOW). The CAT803 requires a pull-up resistor on the
reset output.
The CAT809 features a push-pull RESET output (active
LOW) and the CAT810 features a push-pull RESET
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 1.0V.
The CAT803, CAT809, and CAT810 are available in both
the compact 3-pin SOT-23 and SC-70 packages.

(CAT803)
CAT809
(CAT810)
GND
RESET
(RESET)
VCC
3-Lead SOT23
3-Lead SC70
1
2
3


Voltage


4.63V L
4.38V M
4.00V J
3.08V T
2.93V S
2.63V R
2.32V Z

CAT803, CAT809, CAT810
2
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT803
VCC
VCC
GND
RESET
+
–
DIGITAL
DELAY
VCC
TOLERANCE
BIAS
VOLTAGE
REFERENCE
CAT810
VCC
VCC
RESET
+
–
DIGITAL
DELAY
VCC
TOLERANCE
BIAS
VOLTAGE
REFERENCE
GND
CAT809
VCC
VCC
RESET
+
–
DIGITAL
DELAY
VCC
TOLERANCE
BIAS
VOLTAGE
REFERENCE
GND

  
CAT803 CAT809 CAT810
1 1 1 GND Ground
2 2 — RESET Active LOW reset. RESET is asserted if VCC falls below the reset thresh-
old and remains low for at least 140ms after VCC rises above the reset
threshold.
— — 2 RESET Active HIGH reset. RESET is asserted if VCC falls below the reset thresh-
old and remains high for at least 140ms after VCC rises above the reset
threshold.
3 3 3 VCC Power supply voltage that is monitored.

CAT803, CAT809, CAT810
3Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC 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 Typ  Units
VCC Range TA = 0ºC to +70ºC 1.0 5.5 V
TA = -40ºC to +85ºC 1.2 5.5
Supply Current ICC TA = -40ºC to +85ºC VCC < 5.5V, J/L/M 8 20 µA
VCC < 3.6V, R/S/T/Z 6 15
Reset
Threshold
Voltage
VTH L Threshold TA = +25ºC 4.56 4.63 4.70 V
TA = -40ºC to +85ºC 4.50 4.75
M Threshold TA = +25ºC 4.31 4.38 4.45
TA = -40ºC to +85ºC 4.25 4.50
J Threshold TA = +25ºC 3.93 4.00 4.06
TA = -40ºC to +85ºC 3.89 4.10
T Threshold TA = +25ºC 3.04 3.08 3.11
TA = -40ºC to +85ºC 3.00 3.15
S Threshold TA = +25ºC 2.89 2.93 2.96
TA = -40ºC to +85ºC 2.85 3.00
R Threshold TA = +25ºC 2.59 2.63 2.66
TA = -40ºC to +85ºC 2.55 2.70
Z Threshold TA = +25ºC 2.28 2.32 2.35
TA = -40ºC to +85ºC 2.25 2.38
(1)
Any pin with respect to ground -0.3V to +6.0V
Input Current, VCC 20mA
Output Current, RESET, RESET 20mA
Rate of Rise, VCC 100V/µs
Continuous Power Dissipation
Derate 2.2mW/ºC above 70ºC (SC70) 175 mW
Derate 4mW/ºC above 70ºC (SOT23) 320 mW
Operating Temperature Range -40ºC to +85ºC
Storage Temperature Range -65ºC to +105ºC
Lead Soldering Temperature (10 sec) 300ºC

(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 specication
is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
CAT803, CAT809, CAT810
4
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 5V for
L/M/J versions, VCC = 3.3V for T/S versions, VCC = 3V for R version and VCC = 2.5V for Z version.
(continued)

(1) Production testing done at TA = +25ºC; limits over temperature guaranteed by design only.
(2) RESET output for the CAT809; RESET output for the CAT810.
Parameter Symbol Conditions Min Typ(1)  Units
Reset Threshold Tempco 30 ppm/ºC
VCC to Reset Delay (Note 2) TDVCC = VTH to (VTH - 100 mV) 20 µs
Reset Active Timeout Period TRTA = -40ºC to +85ºC 140 240 460 ms
RESET Output Voltage Low
(Open-drain active LOW,
CAT803 and push-pull,
active LOW, CAT809)
VOL
VCC = VTH min, ISINK = 1.2mA
CAT803R/S/T/Z, CAT809R/S/T/Z
0.3
VVCC = VTH min, ISINK = 3.2mA
CAT803J/L/M, CAT809J/L/M
0.4
VCC > 1.0V, ISINK = 50µA 0.3
RESET Output Voltage High
(Push-pull, active LOW,
CAT809) VOH
VCC = VTH max, ISOURCE = 500µA
CAT809R/S/T/Z
0.8 VCC
V
VCC = VTH max, ISOURCE = 800µA
CAT809J/L/M
VCC - 1.5
RESET Output Voltage Low
(Push-pull, active HIGH,
CAT810) VOL
VCC > VTH max, ISINK = 1.2mA
CAT810R/S/T/Z
0.3
V
VCC > VTH max, ISINK = 3.2mA
CAT810J/L/M
0.4
RESET Output Voltage High
(Push-pull active HIGH,
CAT810)
VOH
1.8V < VCC VTH min,
ISOURCE = 150µA
0.8 VCC
V
CAT803, CAT809, CAT810
5Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 5V for
L/M/J versions, VCC=3.3V for T/S versions, VCC = 3V for R version and VCC = 2.5V 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
SUPPLY CURRENT (µA)
TEMPERATURE (˚C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
14
12
10
8
6
4
2
0
POWER-DOWN RESET DELAY (µS)
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
CAT803, CAT809, CAT810
6
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
0V
CAT803, CAT809
5V
0V
5V
RESET/OUT
RESET
TD
VTH
VCC
TR
(140ms
minimum)
Reset Timeout Period
CAT810
0V
5V


The reset signal is asserted LOW for the CAT803/
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.

TRANSIENT DURATION (µs)
VCC
The CAT803/CAT809/CAT810 protect µPs against
brownout failure. Short duration transients of 4µsec
or less and 100mV amplitude typically do not cause a
false RESET.
Figure 2 shows the maximum pulse duration of negative-
going VCC transients that do not cause a reset condition.

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).
CAT803, CAT809, CAT810
7Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CC
To ensure that the CAT809 RESET pin is in a known
state when VCC is under 1.0V, a >10kΩ pull-down resistor
between RESET pin and GND is recommended. For
the CAT810, a pull-up resistor from RESET pin to VCC
is needed.
CAT809
GND 10kΩ
Power
Supply
RESET
CAT810
GND
10kΩ
Power
Supply
RESET
VCC VCC
Figure 3. RESET Valid with VCC Under 1.0V CC Under 1.1V

CAT809
GND
VCC
Power
Supply
RESET
Buffered
RESET
BUF
RESET
INPUT
GND
Bi-directional
I/O Pin
µP (For example:
68HC11)
VCC

The CAT809/810 can interface with µP/µC bi-directional
reset pins by connecting a 4.7kΩ resistor in series with
the CAT809/810 reset output and the µP/µC bi-directional
reset pin.
CAT803, CAT809, CAT810
8
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
 RESET 
The CAT803 features an open-drain RESET output
and therefore needs a pull-up resistor on the output for
proper operation, as shown on Figure 6. An advantage
of the open-drain output includes the ability to “wire
AND” several outputs together to form an inexpensive
logic circuit. It is also possible to have the pull-up resistor
connected to a different supply which can be higher than
the CAT803 VCC pin. The value of the pull-up resistor
is not critical in most applications, typical values being
between 5kΩ and 10kΩ.
CAT803
GND
VCC
Power
Supply
RESET RESET
INPUT
GND
µP
VCC
5kΩ

CAT803, CAT809, CAT810
9Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice



(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard TO-236.
θ
CAT803, CAT809, CAT810
10
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-203.
θ
E1 E
D
A
L
L1 L2
e e
bA1
A2
c
TOP VIEW
SIDE VIEW END VIEW
θ
1
θ
1
PACKAGE OUTLINE DRAWING
SC-70 3-Lead (SB, SD)
Doc. No. SC703-046-01
01/31/08
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-203.
SYMBOL MIN NOM MAX
A 0.80 1.10
A1 0.00 0.10
A2 0.80 0.90 1.00
b 0.15 0.30
c 0.08 0.22
D 1.80 2.00 2.20
E 1.80 2.10 2.40
E1 1.15 1.25 1.35
e 0.65 BSC
L 0.26 0.36 0.46
L1 0.42 REF
L2 0.15 BSC
θ 0° 8°
θ1 4° 10°
CAT803, CAT809, CAT810
11 Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

Prefix Device # Suffix
809 S TBI G–
Device Type
803: Open-Drain / Active Low Output
809: Push-Pull / Active Low Output
810: Push-Pull / Active High Output
CAT
Trip Level
L: 4.63V
M: 4.38V
J: 4.00V
T: 3.08V
S: 2.93V
R: 2.63V
Z: 2.32V
Company ID Package Type
(1)
TBI: SOT-23 Green
SDI: SC70 Green
Lead Finish
Blank: Matte-Tin
G: NiPdAu
T10
T: Tape & Reel
3: 3000/Reel
10: 10000/Reel


(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead nish is NiPdAu. Contact factory for other lead nishes.
(3) The device used in the example above is a CAT809STBI-GT10 (Push-Pull / Active Low Output, trip level of 2.85V to 3.00V NiPdAu, Tape
and Reel).
(4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales ofce.
(1)
SOT-23
PbSn Finish(2)

Matte Finish(2)


Finish(2)(3)

PbSn Finish(2)

Matte Finish(2)


Finish(2)(3)
CAT803x N/A RPYM RNYM N/A RP__ RN__
CAT809x PAYM PBYM NRYM PA__ PB__ NR__
CAT810x PCYM PDYM NSYM PC__ PD__ NS__

(1) All theshold trip level options have the same marking.
(2) The “YM” in the SOT-23 package marking indicates the Year and Month of roduction and the “_” in the SC70 package marking indicates the
assembly location.
(3) 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.
CAT803, CAT809, CAT810
12
Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

(1) Contact Factory for availability.
CAT803LSDI(1) CAT803LSDI-G CAT809LSDI(1) CAT809LSDI-G CAT810LSDI(1) CAT810LSDI-G
CAT803MSDI(1) CAT803MSDI-G CAT809MSDI(1) CAT809MSDI-G CAT810MSDI(1) CAT810MSDI-G
CAT803JSDI(1) CAT803JSDI-G CAT809JSDI(1) CAT809JSDI-G CAT810JSDI(1) CAT810JSDI-G
CAT803TSDI(1) CAT803TSDI-G CAT809TSDI(1) CAT809TSDI-G CAT810TSDI(1) CAT810TSDI-G
CAT803SSDI(1) CAT803SSDI-G CAT809SSDI(1) CAT809SSDI-G CAT810SSDI(1) CAT810SSDI-G
CAT803RSDI(1) CAT803RSDI-G CAT809RSDI(1) CAT809RSDI-G CAT810RSDI(1) CAT810RSDI-G
CAT803ZSDI(1) CAT803ZSDI-G CAT809ZSDI(1) CAT809ZSDI-G CAT810ZSDI(1) CAT810ZSDI-G
CAT803LTBI(1) CAT803LTBI-G CAT809LTBI(1) CAT809LTBI-G CAT810LTBI(1) CAT810LTBI-G
CAT803MTBI(1) CAT803MTBI-G CAT809MTBI(1) CAT809MTBI-G CAT810MTBI(1) CAT810MTBI-G
CAT803JTBI(1) CAT803JTBI-G CAT809JTBI(1) CAT809JTBI-G CAT810JTBI(1) CAT810JTBI-G
CAT803TTBI(1) CAT803TTBI-G CAT809TTBI(1) CAT809TTBI-G CAT810TTBI(1) CAT810TTBI-G
CAT803STBI(1) CAT803STBI-G CAT809STBI(1) CAT809STBI-G CAT810STBI(1) CAT810STBI-G
CAT803RTBI(1) CAT803RTBI-G CAT809RTBI(1) CAT809RTBI-G CAT810RTBI(1) CAT810RTBI-G
CAT803ZTBI(1) CAT803ZTBI-G CAT809ZTBI(1) CAT809ZTBI-G CAT810ZTBI(1) CAT810ZTBI-G

CAT803, CAT809, CAT810
13 Doc. No. MD-3004, Rev. Z © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice

 Rev. 
29-Oct-03 N Updated VCC Transient Response text and Figure 2
30-Oct-03 O Updated Power Up Reset Timeout vs. Temperature curve
3-Oct-04 P Corrected temperature range
Updated Description
Updated Ordering Information
Updated Absolute Maximum Ratings
Updated Electrical Characteristics
23-Mar-04 Q Updated Description
Updated Ordering Information
Updated Absolute Maximum Ratings
Updated Electrical Characteristics
Updated Typical Operating Characteristics
Updated Package Information
25-Mar-04 R Changed Preliminary designation to Final
Updated Max Reset Active Timeout Period in Electrical Characteristics
Updated package drawings
5-Oct-04 S Updated top marking table
28-Feb-05 T Updated Features
Updated Ordering Information
Updated Top Marking
17-Feb-06 Q Updated Typical Operating Characteristics
10-Aug-06 U Updated Features
Updated Description
Updated Max Reset Active Timeout Period in Electrical Characteristics
Updated Figure 1
Updated Package Information
Correct Revision Number
17-Oct-06 V Updated Top Marking
Updated Detailed Description
Adding CAT803
12-Feb-07 W Updated Electrical Characteristics
Updated Figure 1
Updated Ordering Information
20-Mar-07 X Updated Detailed Descriptions
31-Jan-08 Y Added MD- to Document Number
Added Block Diagrams
Updated Package Outline Drawings
Updated Example of Ordering Information
Updated Ordering Part Number
05-Nov-08 Z Change logo and ne print to ON Semiconductor
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any
products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out
of the application or use of any product or circuit, and specically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters
which may be provided in SCILLC data sheets and/or specications can and do vary in different applications and actual performance may vary over time. All operating parameters, including
“Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC
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 SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any
such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its ofcers, employees, subsidiaries, afliates, and distributors harmless against all claims, costs,
damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even
if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Afrmative Action Employer. This literature is subject to all
applicable copyright laws and is not for resale in any manner.



P.O. Box 5163, Denver, Colorado 80217 USA
 303-675-2175 or 800-344-3860 Toll Free USA/Canada
 303-675-2176 or 800-344-3867 Toll Free USA/Canada
 orderlit@onsemi.com
 800-282-9855 Toll Free
USA/Canada

Phone: 421 33 790 2910

Phone: 81-3-5773-3850

 http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative