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ADM6823RYRJZ-RL7

P1-P3P4-P6P7-P9P10-P12
Low Voltage Supervisory Circuits with
Watchdog and Manual Reset in 5-Lead SOT-23
ADM6821/ADM6822/ADM6823/ADM6824/ADM6825
Rev. 0
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 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Precision low voltage monitoring
9 reset threshold options: 1.58 V to 4.63 V
140 ms (min) reset timeout
Watchdog timer with 1.6 sec timeout
Manual reset input
Reset output stages
Push-pull active-low
Open-drain active-low
Push-pull active-high
Low power consumption (7 μA)
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified from −40°C to +125°C
5-lead SOT-23 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM6823
V
CC
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
04535-001
Figure 1.
GENERAL DESCRIPTION
The ADM682x are supervisory circuits that 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 parts
feature different combinations of watchdog input and manual
reset input and output stage configurations, as shown in
Table 1.
Each part is available in nine reset threshold options, ranging
from 1.58 V to 4.63 V. The reset and watchdog timeout periods
are fixed at 140 ms (min) and 1.6 sec (typ), respectively.
The ADM682x are available in 5-lead SOT-23 packages and
typically consume only 7 μA, 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
ADM6821/ADM6822/ADM6823/ADM6824/ADM6825
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Circuit Description........................................................................... 9
Reset Output ................................................................................. 9
Manual Reset Input ...................................................................... 9
Watchdog Input .............................................................................9
Application Information................................................................ 10
Watchdog Input Current ........................................................... 10
Negative-Going V
CC
Transients ................................................ 10
Ensuring Reset Valid to V
CC
= 0 V........................................... 10
Watchdog Software Considerations......................................... 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
REVISION HISTORY
6/05—Revision 0: Initial Version
ADM6821/ADM6822/ADM6823/ADM6824/ADM6825
Rev. 0 | Page 3 of 12
SPECIFICATIONS
V
CC
= 4.5 V to 5.5 V for ADM682_L/M; V
CC
= 2.7 V to 3.6 V for ADM682_T/S/R; V
CC
= 2.1 V to 2.75 V for ADM682_Z/Y; V
CC
= 1.53 V
to 2.0 V for ADM682_W/V; T
A
= –40°C to +125°C, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range 1 5.5 V
Supply Current 10 20 μA
WDI and
MR unconnected, V
CC
= 5.5 V
7 16 μA
WDI and
MR unconnected, V
CC
= 3.6 V
RESET THRESHOLD VOLTAGE
ADM682xL
4.50 4.63 4.75 V
ADM682xM
4.25 4.38 4.50 V
ADM682xT
3.00 3.08 3.15 V
ADM682xS
2.85 2.93 3.00 V
ADM682xR
2.55 2.63 2.70 V
ADM682xZ
2.25 2.32 2.38 V
ADM682xY
2.12 2.19 2.25 V
ADM682xW
1.62 1.67 1.71 V
ADM682xV
1.52 1.58 1.62 V
RESET THRESHOLD TEMPERATURE COEFFICIENT 60 ppm/°C
RESET THRESHOLD HYSTERESIS 2 x V
TH
mV
V
CC
TO RESET DELAY 20 μs
V
TH
− V
CC
= 100 mV
RESET TIMEOUT PERIOD 140 200 280 ms
RESET Output Voltage
V
OL
(Push-Pull or Open-Drain) 0.3 V V
CC
> = 1 V, I
SINK
= 50 μA
0.3 V V
CC
> = 1.2 V, I
SINK
= 100 μA
0.3 V V
CC
> = 2.55 V, I
SINK
= 1.2 mA
0.4 V V
CC
> = 4.25 V, I
SINK
= 3.2 mA
V
OH
(Push-Pull Only) 0.8 × V
CC
V V
CC
> = 1.8 V, I
SOURCE
= 200 μA
0.8 × V
CC
V V
CC
> = 3.15 V, I
SOURCE
= 500 μA
0.8 × V
CC
V V
CC
> = 4.75 V, I
SOURCE
= 800 μA
RESET OUTPUT LEAKAGE CURRENT (Open-Drain
Only)
1 μA
RESET not asserted
RESET OUTPUT VOLTAGE (Push-Pull Only)
V
OH
0.8 × V
CC
V V
CC
> = 1 V, I
SOURCE
= 1 μA
0.8 × V
CC
V V
CC
> = 1.5 V, I
SOURCE
= 100 μA
0.8 × V
CC
V V
CC
> = 2.55 V, I
SOURCE
= 500 μA
0.8 × V
CC
V V
CC
> = 4.25 V, I
SOURCE
= 800 μA
V
OL
0.3 V V
CC
> = 1.8 V, I
SINK
= 500 μA
0.3 V V
CC
> = 3.15 V, I
SINK
= 1.2 mA
0.4 V V
CC
> = 4.75 V, I
SINK
= 3.2 mA
MANUAL RESET INPUT
(ADM6821/ADM6822/ADM6823/ADM6825)
MR Input Threshold
V
IL
0.3 × V
CC
V
V
IH
0.7 × V
CC
V
MR Input Pulse Width
1 μs
MR Glitch Rejection
100 ns
MR to Reset Delay
200 ns
MR Pull-Up Resistance
25 50 75 kΩ
P1-P3P4-P6P7-P9P10-P12

ADM6823RYRJZ-RL7

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Watchdog Supervisor with MR - IC.
Lifecycle:
New from this manufacturer.
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