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Low Voltage Supervisory Circuits with
Watchdog & Manual Reset in 5-Lead SOT-23
Preliminary Technical Data
ADM6821ADM6825
Rev. PrA
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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
2004 Analog Devices, Inc. All rights reserved.
FEATURES
Precision Low Voltage Monitoring down to 1.8V
9 Reset Threshold Options:
1.58V
to
4.63V
140ms (Min) Reset Timeout
Watchdog Timer with 1.6s Timeout
Manual Reset Input
Reset Output Stages
Push-Pull Active-Low
Open-Drain Active-Low
Push-Pull Active-High
Low Power Consumption (3A)
Guaranteed Reset Output valid to V
CC
=1V
Power Supply Glitch Immunity
Specified from -40C to +125C
5-Lead SOT-23 Package

APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment

GENERAL DESCRIPTION
The ADM6821-ADM6825 are supervisory circuits which
monitor power supply voltage levels and code execution
integrity in microprocessor-based systems. As well as providing
power-on-reset signals, an on-chip watchdog timer can reset the
microprocessor if it fails to strobe within a preset timeout
period. A reset signal can also be asserted by means of an
external push-button, through a manual reset input. The three
parts feature different combinations of watchdog input, manual
reset input and output stage configuration, as shown in table 1.
FUNCTIONAL BLOCK DIAGRAM
RESET
GENERATOR
MR
DEBOUNCE
GND
RESET
V
CC
V
REF
V
CC
ADM6821
WATCHDOG
DETECTOR
WDI




Each part is available in a choice of 9 reset threshold options
ranging from 1.58V to 4.63V. The reset and watchdog timeout
periods are fixed at 140ms (min) and 1.6s (typ), respectively.
The ADM6821-ADM6825 are available in 5-lead SOT-23
packages and typically consume only 3A, making them
suitable for use in low power portable applications.

Table 1. Selection Table
Output Stage
Part No.
Watchdog Timer
Manual Reset
RESET
RESET
ADM6821 Yes
Yes
- Push-Pull
ADM6822 Yes
Yes
Open-Drain -
ADM6823 Yes
Yes Push-Pull -
ADM6824 Yes
- Push-Pull
Push-Pull
ADM6825 -
Yes
Push-Pull
Push-Pull
ADM6821ADM6825
Preliminary Technical Data
Rev.PrA | Page 2 of 7
ADM6821ADM6825--SPECIFICATIONS
Table 2. V
CC
=4. 5V to 5.5V for ADM682_L/M, V
CC
=2.7V to 3.6V for ADM682_T/S/R, V
CC
=2.1V to 2.75V for ADM682_Z/Y,
V
CC
=1.53V to 2.0V for ADM682_W/V, T
A
=-40C to +125C, unless otherwise noted.
Parameter Min
Typ
Max
Units
Test
Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range
1
5.5
V
T
A
=0C to +70C
1.2
5.5
V
T
A
=--40C to +125C
Supply Current (WDI and MR unconnected)
10 24 A
V
CC
=5.5V, no load,
T
A
=--40C to +85C
30
A
V
CC
=5.5V, no load,
T
A
=--40C to +125C
7 16
A
V
CC
=3.6V, no load,
T
A
=--40C to +85C
25
A
V
CC
=3.6V, no load,
T
A
=--40C to +125C
5
12
A
V
CC
=3.6V, no load,
T
A
=--40C to +85C
(ADM6825 only)
20
A
V
CC
=3.6V, no load,
T
A
=--40C to +125C
(ADM6825 only)
RESET THRESHOLD VOLTAGE
ADM682_L
4.50 4.63 4.75 V T
A
=-40C to +85C
4.47
4.78
V
T
A
=-40C to +125C
ADM682_M
4.25 4.38 4.50 V T
A
=-40C to +85C
4.22
4.53
V
T
A
=-40C to +125C
ADM682_T
3.00 3.08 3.15 V T
A
=-40C to +85C
2.97
3.17
V
T
A
=-40C to +125C
ADM682_S
2.85 2.93 3.00 V T
A
=-40C to +85C
2.83
3.02
V
T
A
=-40C to +125C
ADM682_R
2.55 2.63 2.70 V T
A
=-40C to +85C
2.53
2.72
V
T
A
=-40C to +125C
ADM682_Z
2.25 2.32 2.38 V T
A
=-40C to +85C
2.24
2.40
V
T
A
=-40C to +125C
ADM682_Y
2.12 2.19 2.25 V T
A
=-40C to +85C
2.11
2.27
V
T
A
=-40C to +125C
ADM682_W
1.62 1.67 1.71 V T
A
=-40C to +85C
1.61
1.72
V
T
A
=-40C to +125C
ADM682_V
1.52 1.58 1.62 V T
A
=-40C to +85C
RESET THRESHOLD TEMPERATURE COEFFICIENT
60
ppm/C
RESET THRESHOLD HYSTERESIS
2x V
TH
mV
RESET TIMEOUT PERIOD
140
200
280
ms
100
320
ms
V
CC
TO RESET DELAY
20
s
V
CC
= V
TH
to (V
TH
- 100mV)
RESET Output Voltage Low
0.4
V
V
CC
>=4.25V, I
SINK
=3.2mA, reset
asserted
0.3
V
V
CC
>=2.55V, I
SINK
=1.2mA, reset
asserted
0.3
V
V
CC
>=1.25V, I
SINK
=100uA, reset
asserted
0.3
V
V
CC
>=1.0V, I
SINK
=50uA, reset
asserted, T
A
=-40C to +85C
RESET Output Voltage High
0.8
V
CC
V
V
CC
>=4.75V, I
SOURCE
=800uA,
reset not asserted
Preliminary Technical Data
ADM6821ADM6825
Rev.PrA | Page 3 of 7
Parameter Min
Typ
Max
Units
Test
Conditions/Comments
0.8
V
CC
V
V
CC
>=3.15V, I
SOURCE
=500uA,
reset not asserted
0.8
V
CC
V
V
CC
>=1.8V, I
SOURCE
=200uA,
reset not asserted
RESET Output Voltage High
0.8
V
CC
V
CC
>=4.25V, I
SOURCE
=800uA,
reset asserted
0.8
V
CC
V
CC
>=2.55V, I
SOURCE
=500uA,
reset asserted
0.8
V
CC
V
CC
>=1.50V, I
SOURCE
=100uA,
reset asserted
0.8
V
CC
V
CC
>=1.0V, I
SOURCE
=1uA,
reset asserted, T
A
=-40C to +85C
RESET Output Voltage Low
0.4
V
V
CC
>=4.75V, I
SINK
=3.2mA,
reset not asserted
0.3
V
V
CC
>=3.15V, I
SINK
=1.2mA,
reset not asserted
0.3
V
V
CC
>=1.8V, I
SINK
=500uA,
reset not asserted
WATCHDOG INPUT (ADM6821-ADM6824)
Watchdog Timeout Period
1.12
1.6
2.40
s
WDI Pulse Width
50
ns
V
IL
=0.4V, V
IH
=0.8
V
CC
,
WDI Input Threshold
V
IL
0.3xV
CC
V
V
IH
0.7xV
CC
V
WDI Input Current
120
160
A
V
WDI
= V
CC
, time average
-20 -15
A
V
WDI
=0, time average
MANUAL RESET INPUT (ADM6821-ADM6823/ADM6825)
MR Input Threshold
0.3xV
CC
V
0.7xV
CC
V
MR Input Pulse Width
1 s
MR Glitch Rejection
100 ns
MR Pull-up Resistance
25 50 75 k
MR to Reset Delay
200 ns
ABSOLUTE MAXIMUM RATINGS
Table 3. T
A
= 25C unless otherwise noted.
Parameter
Rating
V
CC
-0.3V to +6V
Output Current (RESET, RESET)
20mA
Operating Temperature Range
-40C to +125C
Storage Temperature Range
-65C to +150C
JA
Thermal Impedance
270C/W
Lead Temperature
Soldering (10 sec)
300C
Vapour Phase (60 sec)
215C
Infrared (15 sec)
220C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and 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.
ADM6821ADM6825
Preliminary Technical Data
Rev.PrA | Page 4 of 7
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
1
2
3
4
5
ADM6822/
ADM6823
TOP VIEW
(Not to Scale)
V
CC
RESET
GND
MR
WDI
1
2
3
4
5
ADM6821
TOP VIEW
(Not to Scale)
V
CC
RESET
GND
MR
WDI
1
2
3
4
5
ADM6824
TOP VIEW
(Not to Scale)
V
CC
RESET
GND
RESET
WDI
1
2
3
4
5
ADM6825
TOP VIEW
(Not to Scale)
V
CC
RESET
GND
RESET
MR
Table 4. Pin Functional Descriptions
Pin No.
Name
Description
1
RESET (ADM6822/23/24/25)
Active-Low Reset Output, which is asserted whenever V
CC
is below the reset.threshold,
V
TH
.
Open-Drain Output Stage for ADM6822.
Push-Pull Output Stage for ADM6823/24/25.
RESET (ADM6821)
Active-High Reset Output
2 GND
Ground
3
MR (ADM6821/22/23)
Manual Reset Input. This is an active-low input which, when forced low for at least 1s,
generates a reset.
Features a 52k internal pull-up.
RESET
(ADM6824/ADM6825) Active-High Push-Pull Reset Output.
4 WDI
(ADM6821/22/23/24)
Watchdog Input. Generates a reset if the voltage on the pin remains low or high for the
duration of the watchdog timeout. The timer is cleared if a logic transition occurs on this
pin or if a reset is generated.
MR (ADM6825)
Manual Reset Input.
5 V
CC
Power Supply Voltage being Monitored
ESD CAUTION
`
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Preliminary Technical Data
ADM6821ADM6825
Rev. PrA | Page 5 of 7
ORDERING GUIDE
Model
Reset Threshold (V)
Temperature Range
Quantity
Package Type
Branding
ADM6821LART-RL
4.63
-40C to +125C
10k
SOT-23-5
N0A
ADM6821LART-RL7
4.63
-40C to +125C
3k
SOT-23-5
N0A
ADM6821MART-RL
4.38
-40C to +125C
10k
SOT-23-5
N0A
ADM6821MART-RL7
4.38
-40C to +125C
3k
SOT-23-5
N0A
ADM6821TART-RL
3.08
-40C to +125C
10k
SOT-23-5
N0A
ADM6821TART-RL7
3.08
-40C to +125C
3k
SOT-23-5
N0A
ADM6821SART-RL
2.93
-40C to +125C
10k
SOT-23-5
N0A
ADM6821SART-RL7
2.93
-40C to +125C
3k
SOT-23-5
N0A
ADM6821RART-RL
2.63
-40C to +125C
10k
SOT-23-5
N0A
ADM6821RART-RL7
2.63
-40C to +125C
3k
SOT-23-5
N0A
ADM6821ZART-RL
2.32
-40C to +125C
10k
SOT-23-5
N0A
ADM6821ZART-RL7
2.32
-40C to +125C
3k
SOT-23-5
N0A
ADM6821YART-RL 2.19
-40C
to +125C
10k
SOT-23-5
N0A
ADM6821YART-RL7 2.19
-40C
to +125C
3k
SOT-23-5
N0A
ADM6821WART-RL
1.67
-40C to +125C
10k
SOT-23-5
N0A
ADM6821WART-RL7
1.67
-40C to +125C
3k
SOT-23-5
N0A
ADM6821VART-RL
1.58
-40C to +125C
10k
SOT-23-5
N0A
ADM6821VART-RL7
1.58
-40C to +125C
3k
SOT-23-5
N0A
ADM6822LART-RL
4.63
-40C to +125C
10k
SOT-23-5
N0B
ADM6822LART-RL7
4.63
-40C to +125C
3k
SOT-23-5
N0B
ADM6822MART-RL
4.38
-40C to +125C
10k
SOT-23-5
N0B
ADM6822MART-RL7
4.38
-40C to +125C
3k
SOT-23-5
N0B
ADM6822TART-RL
3.08
-40C to +125C
10k
SOT-23-5
N0B
ADM6822TART-RL7
3.08
-40C to +125C
3k
SOT-23-5
N0B
ADM6822SART-RL
2.93
-40C to +125C
10k
SOT-23-5
N0B
ADM6822SART-RL7
2.93
-40C to +125C
3k
SOT-23-5
N0B
ADM6822RART-RL
2.63
-40C to +125C
10k
SOT-23-5
N0B
ADM6822RART-RL7
2.63
-40C to +125C
3k
SOT-23-5
N0B
ADM6822ZART-RL
2.32
-40C to +125C
10k
SOT-23-5
N0B
ADM6822ZART-RL7
2.32
-40C to +125C
3k
SOT-23-5
N0B
ADM6822YART-RL
2.19
-40C to +125C
10k
SOT-23-5
N0B
ADM6822YART-RL7
2.19
-40C to +125C
3k
SOT-23-5
N0B
ADM6822WART-RL
1.67
-40C to +125C
10k
SOT-23-5
N0B
ADM6822WART-RL7
1.67
-40C to +125C
3k
SOT-23-5
N0B
ADM6822VART-RL
1.58
-40C to +125C
10k
SOT-23-5
N0B
ADM6822VART-RL7
1.58
-40C to +125C
3k
SOT-23-5
N0B
ADM6823LART-RL
4.63
-40C to +125C
10k
SOT-23-5
N0C
ADM6823LART-RL7
4.63
-40C to +125C
3k
SOT-23-5
N0C
ADM6823MART-RL
4.38
-40C to +125C
10k
SOT-23-5
N0C
ADM6823MART-RL7
4.38
-40C to +125C
3k
SOT-23-5
N0C
ADM6823TART-RL
3.08
-40C to +125C
10k
SOT-23-5
N0C
ADM6823TART-RL7
3.08
-40C to +125C
3k
SOT-23-5
N0C
ADM6823SART-RL
2.93
-40C to +125C
10k
SOT-23-5
N0C
ADM6823SART-RL7
2.93
-40C to +125C
3k
SOT-23-5
N0C
ADM6823RART-RL
2.63
-40C to +125C
10k
SOT-23-5
N0C
ADM6823RART-RL7
2.63
-40C to +125C
3k
SOT-23-5
N0C
ADM6823ZART-RL
2.32
-40C to +125C
10k
SOT-23-5
N0C
ADM6823ZART-RL7
2.32
-40C to +125C
3k
SOT-23-5
N0C
ADM6823YART-RL 2.19
-40C
to +125C
10k
SOT-23-5
N0C
ADM6823YART-RL7 2.19
-40C
to +125C
3k
SOT-23-5
N0C
ADM6821ADM6825
Preliminary Technical Data
Rev.PrA | Page 6 of 7
ORDERING GUIDE (CONTD.)
Model
Reset Threshold (V)
Temperature Range
Quantity
Package Type
Branding
ADM6823WART-RL
1.67
-40C to +125C
10k
SOT-23-5
N0C
ADM6823WART-RL7
1.67
-40C to +125C
3k
SOT-23-5
N0C
ADM6823VART-RL
1.58
-40C to +125C
10k
SOT-23-5
N0C
ADM6823VART-RL7
1.58
-40C to +125C
3k
SOT-23-5
N0C
ADM6824LART-RL
4.63
-40C to +125C
10k
SOT-23-5
N0D
ADM6824LART-RL7
4.63
-40C to +125C
3k
SOT-23-5
N0D
ADM6824MART-RL
4.38
-40C to +125C
10k
SOT-23-5
N0D
ADM6824MART-RL7
4.38
-40C to +125C
3k
SOT-23-5
N0D
ADM6824TART-RL
3.08
-40C to +125C
10k
SOT-23-5
N0D
ADM6824TART-RL7
3.08
-40C to +125C
3k
SOT-23-5
N0D
ADM6824SART-RL
2.93
-40C to +125C
10k
SOT-23-5
N0D
ADM6824SART-RL7
2.93
-40C to +125C
3k
SOT-23-5
N0D
ADM6824RART-RL
2.63
-40C to +125C
10k
SOT-23-5
N0D
ADM6824RART-RL7
2.63
-40C to +125C
3k
SOT-23-5
N0D
ADM6824ZART-RL
2.32
-40C to +125C
10k
SOT-23-5
N0D
ADM6824ZART-RL7
2.32
-40C to +125C
3k
SOT-23-5
N0D
ADM6824YART-RL 2.19
-40C
to +125C
10k
SOT-23-5
N0D
ADM6824YART-RL7 2.19
-40C
to +125C
3k
SOT-23-5
N0D
ADM6824WART-RL
1.67
-40C to +125C
10k
SOT-23-5
N0D
ADM6824WART-RL7
1.67
-40C to +125C
3k
SOT-23-5
N0D
ADM6824VART-RL
1.58
-40C to +125C
10k
SOT-23-5
N0D
ADM6824VART-RL7
1.58
-40C to +125C
3k
SOT-23-5
N0D
ADM6825LART-RL
4.63
-40C to +125C
10k
SOT-23-5
N0E
ADM6825LART-RL7
4.63
-40C to +125C
3k
SOT-23-5
N0E
ADM6825MART-RL
4.38
-40C to +125C
10k
SOT-23-5
N0E
ADM6825MART-RL7
4.38
-40C to +125C
3k
SOT-23-5
N0E
ADM6825TART-RL
3.08
-40C to +125C
10k
SOT-23-5
N0E
ADM6825TART-RL7
3.08
-40C to +125C
3k
SOT-23-5
N0E
ADM6825SART-RL
2.93
-40C to +125C
10k
SOT-23-5
N0E
ADM6825SART-RL7
2.93
-40C to +125C
3k
SOT-23-5
N0E
ADM6825RART-RL
2.63
-40C to +125C
10k
SOT-23-5
N0E
ADM6825RART-RL7
2.63
-40C to +125C
3k
SOT-23-5
N0E
ADM6825ZART-RL
2.32
-40C to +125C
10k
SOT-23-5
N0E
ADM6825ZART-RL7
2.32
-40C to +125C
3k
SOT-23-5
N0E
ADM6825YART-RL 2.19
-40C
to +125C
10k
SOT-23-5
N0E
ADM6825YART-RL7 2.19
-40C
to +125C
3k
SOT-23-5
N0E
ADM6825WART-RL
1.67
-40C to +125C
10k
SOT-23-5
N0E
ADM6825WART-RL7
1.67
-40C to +125C
3k
SOT-23-5
N0E
ADM6825VART-RL
1.58
-40C to +125C
10k
SOT-23-5
N0E
ADM6825VART-RL7
1.58
-40C to +125C
3k
SOT-23-5
N0E
Preliminary Technical Data
ADM6821ADM6825
Rev. PrA | Page 7 of 7
OUTLINE DIMENSIONS
PIN 1
1.60 BSC
2.80 BSC
1.90
BSC
0.95 BSC
1
3
4
5
2
0.22
0.08
10
5
0
0.50
0.3
0.15 MAX
SEATING
PLANE
1.45 MAX
1.30
1.15
0.90
2.90 BSC
0.
$
0.45
0.3
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 1. 5-Lead Small Outline Transistor Package [SOT-23]
(RT-5)
Dimensions shown in millimeters
2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A.
PR04535-0-2/04(PrA)