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ADM823 Datasheet(PDF) 1 Page - Analog Devices

Part # ADM823
Description  Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM823 Datasheet(HTML) 1 Page - Analog Devices

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Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
Data Sheet
ADM823/ADM824/ADM825
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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 VCC = 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
VCC
VCC
MR
GND
WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
VREF
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


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