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ADM825LYRJ-R7

P1-P3P4-P6P7-P9P10-P12
Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
Data Sheet
ADM823/ADM824/ADM825
Rev. D Document Feedback
Inform
ation 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
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Tel: 781.329.4700 ©2004–2013 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Precision 2.5 V to 5 V power supply monitor
7 reset threshold options: 2.19 V to 4.63 V
140 ms (minimum) reset timeout
Watchdog timer with 1.6 sec timeout (ADM823, ADM824)
Manual reset input (ADM823, ADM825)
Push-pull output stages
RESET
(ADM823)
RESET
, RESET (ADM824/ADM825)
Low power consumption: 5 µA
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified over automotive temperature range
5-lead SC70 and SOT-23 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM823
V
CC
V
CC
MR
GND
WDI
RESET
RESET
GENERATOR
W
A
TCHDOG
DETEC
TOR
DEBOUNCE
V
REF
04534-001
Figure 1.
GENERAL DESCRIPTION
The ADM823/ADM824/ADM825 are supervisory circuits that
monitor power supply voltage levels and code execution integrity
in microprocessor-based systems. In addition to 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 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.
These parts are available in a choice of seven reset threshold
options ranging from 2.19 V to 4.63 V. The reset and watchdog
timeout periods are fixed at 140 ms (minimum) and 1.6 sec
(typical), respectively.
The ADM823/ADM824/ADM825 are available in 5-lead SC70
and SOT-23 packages and typically consume only 5 µA, making
them suitable for use in low power, portable applications.
Table 1. Selection Table
Part No. Watchdog Timer Manual Reset
Output Stage
RESET
RESET
ADM823 Yes Yes Push-Pull –
ADM824 Yes – Push-Pull Push-Pull
ADM825 – Yes Push-Pull Push-Pull
ADM823/ADM824/ADM825 Data Sheet
Rev. D | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
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
Applications 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
7/13—Rev. C to Rev. D
Change to Figure 16 .......................................................................... 9
Updated Outline Dimensions ........................................................ 11
10/10—Rev. B to Rev. C
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
5/08—Rev. A to Rev. B
Changes to General Description Section ...................................... 1
Changes to Table 4 ............................................................................ 6
Changes to Ordering Guide .......................................................... 11
2/07—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Ordering Guide .......................................................... 11
10/04—Revision 0: Initial Version
Data Sheet ADM823/ADM824/ADM825
Rev. D | Page 3 of 12
SPECIFICATIONS
V
CC
= 4.75 V to 5.5 V for ADM82xL, V
CC
= 4.5 V to 5.5 V for ADM82xM, V
CC
= 3.15 V to 3.6 V for ADM82xT, V
CC
= 3 V to 3.6 V
for ADM82xS, V
CC
= 2.7 V to 3.6 V for ADM82xR, V
CC
= 2.38 V to 2.75 V for ADM82xZ, V
CC
= 2.25 V to 2.75 V for ADM82xY,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range 1 5.5 V T
A
= 0°C to 70°C
1.2 V T
A
= T
MIN
to T
MAX
Supply Current 10 24 µA WDI and
MR
unconnected
ADM82xL/M
5 12 µA WDI and
MR
unconnected
ADM82xT/S/R/Z/Y
RESET THRESHOLD VOLTAGE
ADM82xL
4.56 4.63 4.70 V T
A
= 25°C
4.50 4.75 V T
A
= T
MIN
to T
MAX
ADM82xM
4.31 4.38 4.45 V T
A
= 25°C
4.25 4.50 V T
A
= T
MIN
to T
MAX
ADM82xT
3.04 3.08 3.11 V T
A
= 25°C
3.00
3.15
T
A
= T
MIN
to T
MAX
ADM82xS
2.89 2.93 2.96 V T
A
= 25°C
2.85 3.00 V T
A
= T
MIN
to T
MAX
ADM82xR
2.59 2.63 2.66 V T
A
= 25°C
2.55 2.70 V T
A
= T
MIN
to T
MAX
ADM82xZ (SC70 Only)
2.28 2.32 2.35 V T
A
= 25°C
2.25 2.38 V T
A
= T
MIN
to T
MAX
ADM82xY (SC70 Only)
2.16 2.19 2.22 V T
A
= 25°C
2.13 2.25 V T
A
= T
MIN
to T
MAX
RESET THRESHOLD TEMPERATURE COEFFICIENT 40 ppm/°C
RESET THRESHOLD HYSTERESIS 10 mV ADM82xL/M
5
ADM82xT/S/R/Z/Y
RESET TIMEOUT PERIOD 140 200 280 ms
V
CC
TO RESET DELAY 40 µs V
TH
− V
CC
= 100 mV
RESET
/RESET
RESET
Output Voltage 0.4 V V
CC
= V
TH
min, I
SINK
= 3.2 mA,
ADM82xL/M
0.3 V V
CC
= V
TH
min, I
SINK
= 1.2 mA,
ADM82xT/S/R/Z/Y
0.3 V T
A
= 0°C to 70°C, V
CC
= 1 V,
V
CC
falling, I
SINK
= 50 µA
V
CC
− 1.5 V V
CC
= V
TH
max, I
SOURCE
= 120 µA,
ADM82xL/M
0.8 × V
CC
V V
CC
= V
TH
max, I
SOURCE
= 30 µA,
ADM82xT/S/R/Z/Y
RESET Output Voltage (ADM824, ADM825) 0.4 V V
CC
= V
TH
max, I
SINK
= 3.2 mA,
ADM82xL/M
0.3 V V
CC
= V
TH
max, I
SINK
= 1.2 mA,
ADM82xT/S/R/Z/Y
0.8 × V
CC
V V
CC
≥ 1.8 V, I
SOURCE
= 150 µA
P1-P3P4-P6P7-P9P10-P12

ADM825LYRJ-R7

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Watchdog Supervisor with MR - IC.
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