Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
ADM803/ADM809/ADM810
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
CC
140 ms minimum power-on reset
Open-drain RESET output (ADM803)
Push-pull RESET output (ADM809)
Push-pull RESET output (ADM810)
SC70 and SOT-23 packages
FUNCTIONAL BLOCK DIAGRAMS
ADM803
V
CC
V
REF
RESET
GENERATOR
240ms
RESET
GND
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
V
CC
V
CC
ADM809/ADM810
RESET
GENERATOR
240ms
V
REF
RESET
(RESET)
GND
V
CC
*R
PULL-UP
V
CC
MICROPROCESSOR
SYSTEM
RESET
INPUT
03736-001
ADM803/ADM809
RESET
GND
GND
*ADM803 ONLY
Figure 1.
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
CC
as low as 1 V. The ADM803 and
ADM809 provide an active low reset signal (RESET), whereas
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.
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.
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.
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Tel: 781.329.4700
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Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved.
ADM803/ADM809/ADM810
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
Pin Configurations and Function Descriptions ............................5
Typical Performance Characteristics ..............................................6
Interfacing to Other Devices ............................................................8
Ensuring a Valid Reset Output Down to V
CC
= 0 V .................8
Benefits of an Accurate Reset Threshold ...................................8
Interfacing to Microprocessors with Multiple Interrupts ........8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
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
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
SPECIFICATIONS
V
CC
= full operating range, T
A
= T
MIN
to T
MAX
, V
CC
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
Z models, unless otherwise noted.
Table 1.
Parameter
V
CC
OPERATING VOLTAGE RANGE
Supply Current
Min
1.0
1.2
Typ
Max
5.5
5.5
35
30
60
60
4.70
4.75
4.82
4.45
4.50
4.56
4.06
4.10
4.20
3.11
3.15
3.21
2.96
3.00
3.05
2.66
2.70
2.74
2.35
2.38
2.42
Unit
V
V
μA
μA
μA
μA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ppm/°C
μs
ms
ms
V
V
V
V
V
0.3
0.4
RESET OUTPUT VOLTAGE HIGH (ADM810)
0.8 V
CC
RESET OPEN-DRAIN OUTPUT
Leakage Current (ADM803)
1
Rev. H | Page 3 of 12
24
17
Test Conditions/Comments
T
A
= 0°C to 70°C
T
A
= −40°C to +125°C
V
CC
< 5.5 V, ADM8xxL/M/J, T
A
= −40°C to +85°C
V
CC
< 3.6 V, ADM8xxR/S/T/Z, T
A
= −40°C to +85°C
V
CC
< 5.5 V, ADM8xxL/M/J, T
A
= 85°C to 125°C
V
CC
< 3.6 V, ADM8xxR/S/T/Z, T
A
= 85°C to 125° C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= 25°C (ADM809/ADM810 only)
T
A
= −40°C to +85°C (ADM809/ADM810 only)
T
A
= −40°C to +125°C (ADM809/ADM810 only)
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
V
CC
= V
TH
to (V
TH
− 100 mV)
T
A
= −40°C to +85°C
T
A
= 85°C to 125°C
V
CC
= V
TH
min, I
SINK
= 1.2 mA, ADM803R/S/T/Z,
ADM809R/S/T/Z
V
CC
= V
TH
min, I
SINK
= 3.2 mA, ADM803L/M/J,
ADM809L/M/J
V
CC
> 1.0 V, I
SINK
= 50 μA
V
CC
> V
TH
max, I
SOURCE
= 500 μA, ADM809R/S/T/Z
V
CC
> V
TH
max, I
SOURCE
= 800 μA, ADM809L/M/J
V
CC
= V
TH
min, I
SINK
= 1.2 mA, ADM810R/S/T/Z
V
CC
= V
TH
min, I
SINK
= 3.2 mA, ADM810L/M/J
1.8 V < V
CC
< V
TH
min, I
SOURCE
= 150 μA
V
CC
> V
TH
, RESETdeasserted
RESET VOLTAGE THRESHOLD
ADM8xxL
ADM8xxM
ADM8xxJ
ADM8xxT
ADM8xxS
ADM8xxR
ADM8xxZ
4.56
4.50
4.44
4.31
4.25
4.20
3.93
3.89
3.80
3.04
3.00
2.95
2.89
2.85
2.81
2.59
2.55
2.52
2.28
2.25
2.22
4.63
4.38
4.00
3.08
2.93
2.63
2.32
RESET THRESHOLD TEMPERATURE COEFFICIENT
V
CC
to Reset Delay
RESET ACTIVE TIMEOUT PERIOD
RESET OUTPUT VOLTAGE LOW (ADM803/ADM809)
140
100
30
20
240
460
840
0.3
0.4
0.3
RESET OUTPUT VOLTAGE HIGH (ADM809)
0.8 V
CC
V
CC
− 1.5
RESET OUTPUT VOLTAGE LOW (ADM810)
V
V
V
μA
ADM803/ADM809/ADM810
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
V
CC
RESET, RESET
Input Current
V
CC
Output Current
RESET, RESET (Push-Pull)
RESET (Open Drain)
Rate of Rise, V
CC
θ
JA
Thermal Impedance
SC70
SOT-23
Lead Temperature (Soldering, 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Storage Temperature Range
Ratings
−0.3 V to +6 V
−0.3 V to V
CC
+ 0.5 V
20 mA
20 mA
−0.3 V to +6.0 V
100 V/μs
146°C/W
270°C/W
300°C
215°C
220°C
−65°C to +150°C
Table 3. Reset Threshold Options
RESET Model
ADM8xxL
ADM8xxM
ADM8xxJ (ADM809/ADM810 Only)
ADM8xxT
ADM8xxS
ADM8xxR
ADM8xxZ
Threshold (V)
4.63
4.38
4.00
3.08
2.93
2.63
2.32
V
CC
V
REF
V
REF
V
REF
V
REF
RESET
t
1
t
1 = RESET TIME = 240ms TYP
t
1
03736-003
V
REF
= RESET VOLTAGE THRESHOLD
Figure 2. Power Fail Reset Timing
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.
ESD CAUTION
Rev. H | Page 4 of 12
ADM803/ADM809/ADM810
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
GND 1
ADM803/
ADM809/
03736-002
GND 1
ADM810
03736-102
3 V
CC
TOP VIEW
(Not to Scale)
RESET 2
3 V
CC
TOP VIEW
(Not to Scale)
RESET 2
Figure 3. ADM803/ADM809 Pin Configuration
Figure 4. ADM810 Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
ADM803/ADM809
1
N/A
2
3
ADM810
1
2
N/A
3
Mnemonic
GND
RESET
RESET
V
CC
Description
Ground Reference for All Signals; 0 V.
Active High Logic Output. RESET remains high while V
CC
is below the reset threshold
and remains high for 240 ms (typical) after V
CC
rises above the reset threshold.
Active Low Logic Output. RESET remains low while V
CC
is below the reset threshold
and remains low for 240 ms (typical) after V
CC
rises above the reset threshold.
Supply Voltage Being Monitored.
Rev. H | Page 5 of 12
