ANALOG DEVICES ADM803, ADM809, ADM810 Service Manual
Microprocessor Supervisory Circuits
www.BDTIC.com/ADI
FEATURES
Specified over temperature
Low power consumption: 17 μA
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
Reset assertion down to 1 V V
140 ms minimum power-on reset
Open-drain
Push-pull
RESET
output (ADM803)
RESET
output (ADM809)
Push-pull RESET output (ADM810)
SC70 and SOT-23 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
CC
in 3-Lead SC70 and SOT-23
ADM803/ADM809/ADM810
FUNCTIONAL BLOCK DIAGRAMS
ADM803
V
CC
V
REF
ADM809/ADM810
V
CC
V
REF
V
CC
RESET
GENERATOR
240ms
GND
RESET
GENERATOR
240ms
GND
RESET
RESET
(RESET)
GENERAL DESCRIPTION
The ADM803/ADM809/ADM810 supervisory circuits monitor
the power supply voltage in microprocessor systems. They
provide a reset output during power-up, power-down, and
brownout conditions. On power-up, an internal timer holds
reset asserted for 240 ms. This holds the microprocessor in a
reset state until conditions have stabilized. The reset output
remains operational with V
ADM809 provide an active low reset signal (
the ADM810 provides an active high signal (RESET) output.
The ADM809 and ADM810 have push-pull outputs, whereas
the ADM803 has an open-drain output, which requires an
external pull-up resistor.
as low as 1 V. The ADM803 and
CC
RESET
), whereas
V
CC
ADM803/ADM809
RESET
GND GND
*R
PULL-UP
*ADM803 ONLY
Figure 1.
V
CC
MICROPROCESSOR
SYSTEM
RESET
INPUT
Seven reset threshold voltage options are available, suitable for
monitoring a variety of supply voltages (see Table 3).
The reset comparator features built-in glitch immunity, making
it immune to fast transients on V
.
CC
The ADM803/ADM809/ADM810 consume only 17 μA, making
them suitable for low power, portable equipment. The ADM803
is available in a 3-lead SC70; the ADM809/ADM810 are available
in 3-lead SOT-23 and 3-lead SC70 packages.
03736-001
Rev. H
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved.
ADM803/ADM809/ADM810
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
REVISION HISTORY
8/08—Rev. G to Rev. H
Added Figure 4; Renumbered Sequentially .................................. 5
Changes to Figure 8 .......................................................................... 6
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide .......................................................... 10
9/06—Rev. F to Rev. G
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide ............................................................ 9
6/05—Rev. E to Rev. F.
Changes to Ordering Guide ............................................................ 4
Updated Outline Dimensions ......................................................... 9
2/05—Rev. D to Rev. E.
Changes to Ordering Guide ............................................................ 4
2/05—Rev. C to Rev. D.
Changes to Ordering Guide ............................................................ 4
Updated Outline Dimensions ......................................................... 8
5/03—Rev. B to Rev. C.
Added ADM803 .................................................................. Universal
Changes to Features .......................................................................... 1
Changes to General Description .................................................... 1
Changes to Figure 1 .......................................................................... 1
Changes to Specifications ................................................................ 2
Changes to Table I ............................................................................ 3
Updated Ordering Guide ................................................................. 4
Pin Configurations and Function Descriptions ............................5
Typical Performance Characteristics ..............................................6
Interfacing to Other Devices ............................................................8
Ensuring a Valid Reset Output Down to VCC = 0 V .................8
Benefits of an Accurate Reset Threshold ...................................8
Interfacing to Microprocessors with Multiple Interrupts ........8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
1/03—Rev. A to Rev. B.
Changes to Specifications ................................................................. 2
Changes to Table I ............................................................................. 3
Changes to Ordering Guide ............................................................. 4
Changes to TPCs 1–3, and TPC 7 ................................................... 5
Updated Outline Dimensions .......................................................... 7
10/02—Rev. 0 to Rev. A.
Addition of SC70 package ................................................. Universal
Change to General Description ....................................................... 1
Changes to Specifications ................................................................. 2
Changes to Absolute Maximum Ratings ........................................ 3
Change to Table I ............................................................................... 3
Change to Ordering Guide ............................................................... 4
Change to TPC 1 ............................................................................... 5
Updated Outline Dimensions .......................................................... 7
4/97—Revision 0: Initial Version
Rev. H | Page 2 of 12
ADM803/ADM809/ADM810
www.BDTIC.com/ADI
SPECIFICATIONS
VCC = full operating range, TA = T
Z models, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
VCC OPERATING VOLTAGE RANGE 1.0 5.5 V TA = 0°C to 70°C
1.2 5.5 V TA = −40°C to +125°C
Supply Current 24 35 μA VCC < 5.5 V, ADM8xxL/M/J, TA = −40°C to +85°C
17 30 μA VCC < 3.6 V, ADM8xxR/S/T/Z, TA = −40°C to +85°C
60 μA VCC < 5.5 V, ADM8xxL/M/J, TA = 85°C to 125°C
60 μA VCC < 3.6 V, ADM8xxR/S/T/Z, TA = 85°C to 125° C
RESET VOLTAGE THRESHOLD
ADM8xxL 4.56 4.63 4.70 V TA = 25°C
4.50 4.75 V TA = −40°C to +85°C
4.44 4.82 V TA = −40°C to +125°C
ADM8xxM 4.31 4.38 4.45 V TA = 25°C
4.25 4.50 V TA = −40°C to +85°C
4.20 4.56 V TA = −40°C to +125°C
ADM8xxJ 3.93 4.00 4.06 V TA = 25°C (ADM809/ADM810 only)
3.80 4.20 V TA = −40°C to +125°C (ADM809/ADM810 only)
ADM8xxT 3.04 3.08 3.11 V TA = 25°C
3.00 3.15 V TA = −40°C to +85°C
2.95 3.21 V TA = −40°C to +125°C
ADM8xxS 2.89 2.93 2.96 V TA = 25°C
2.85 3.00 V TA = −40°C to +85°C
2.81 3.05 V TA = −40°C to +125°C
ADM8xxR 2.59 2.63 2.66 V TA = 25°C
2.55 2.70 V TA = −40°C to +85°C
2.52 2.74 V TA = −40°C to +125°C
ADM8xxZ 2.28 2.32 2.35 V TA = 25°C
2.25 2.38 V TA = −40°C to +85°C
2.22 2.42 V TA = −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 30 ppm/°C
VCC to Reset Delay 20 μs VCC = VTH to (VTH − 100 mV)
RESET ACTIVE TIMEOUT PERIOD 140 240 460 ms TA = −40°C to +85°C
100 840 ms TA = 85°C to 125°C
RESET OUTPUT VOLTAGE LOW (ADM803/ADM809)
0.4 V
0.3 V VCC > 1.0 V, I
RESET OUTPUT VOLTAGE HIGH (ADM809)
0.8 VCC V VCC > VTH max, I
V
RESET OUTPUT VOLTAGE LOW (ADM810)
0.3 V VCC = VTH min, I
0.4 V VCC = VTH min, I
RESET OUTPUT VOLTAGE HIGH (ADM810)
0.8 VCC V 1.8 V < VCC < VTH min, I
RESET OPEN-DRAIN OUTPUT
Leakage Current (ADM803) 1 μA
MIN
to T
, VCC typical = 5 V for L/M/J models, 3.3 V for T/S models, 3 V for R models, and 2.5 V for
MAX
3.89 4.10 V TA = −40°C to +85°C (ADM809/ADM810 only)
0.3 V
VCC = VTH min, I
= 1.2 mA, ADM803R/S/T/Z,
SINK
ADM809R/S/T/Z
= VTH min, I
V
CC
= 3.2 mA, ADM803L/M/J,
SINK
ADM809L/M/J
= 50 μA
SINK
= 500 μA, ADM809R/S/T/Z
SOURCE
− 1.5 V VCC > VTH max, I
CC
= 800 μA, ADM809L/M/J
SOURCE
= 1.2 mA, ADM810R/S/T/Z
SINK
= 3.2 mA, ADM810L/M/J
SINK
= 150 μA
SOURCE
> VTH, RESETdeasserted
V
CC
Rev. H | Page 3 of 12
ADM803/ADM809/ADM810
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Ratings
VCC −0.3 V to +6 V
RESET, RESET
−0.3 V to VCC + 0.5 V
Input Current
VCC 20 mA
Output Current
RESET, RESET (Push-Pull)
RESET (Open Drain)
20 mA
−0.3 V to +6.0 V
Rate of Rise, VCC 100 V/μs
θJA Thermal Impedance
SC70 146°C/W
SOT-23 270°C/W
Lead Temperature (Soldering, 10 sec) 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
Storage Temperature Range −65°C to +150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 3. Reset Threshold Options
RESET Model Threshold (V)
ADM8xxL 4.63
ADM8xxM 4.38
ADM8xxJ (ADM809/ADM810 Only) 4.00
ADM8xxT 3.08
ADM8xxS 2.93
ADM8xxR 2.63
ADM8xxZ 2.32
V
RESET
V
CC
REF
t
1
t
1 = RESET TIME = 240ms TYP
= RESET VOL T AG E T HRE SHO L D
V
REF
V
REF
Figure 2. Power Fail Reset Timing
V
REF
t
1
V
REF
03736-003
ESD CAUTION
Rev. H | Page 4 of 12
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