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ADM824 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM824
Beschreibung Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23
Hersteller Analog Devices
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Gesamt 10 Seiten
ADM824 Datasheet, Funktion
Preliminary Technical Data
Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
ADM823/ADM824/ADM825
FEATURES
Precision 2.5 V to 5 V power supply monitor
7 reset threshold options: 2.19 V to 4.63 V
140 ms (min) reset timeout
Watchdog timer with 1.6s timeout (ADM823, ADM824)
Manual reset input (ADM823, ADM825)
Push-pull output stages:
RESET (ADM823)
RESET, RESET (ADM824/ADM825)
Low power consumption (3 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
GENERAL DESCRIPTION
The ADM823/ADM824/ADM825 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
ADM823
VCC
VREF
RESET
GENERATOR
VCC
MR DEBOUNCE
WATCHDOG
DETECTOR
RESET
GND
WDI
Figure 1.
Each part is 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 (min) and 1.6s (typ),
respectively.
The ADM823/ADM824/ADM825 are available in 5-lead SC70
and SOT-23 packages and typically consume only 3 µA, making
them suitable for use in low power portable applications.
Table 1. Selection Table
Part No.
ADM823
ADM824
ADM825
Watchdog Timer
Yes
Yes
Manual Reset
Yes
Yes
RESET
Push-Pull
Push-Pull
Push-Pull
Output Stage
RESET
Push-Pull
Push-Pull
Rev.PrB
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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.






ADM824 Datasheet, Funktion
ADM823/ADM824/ADM825
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RESET 1
5 VCC
ADM823
GND 2 TOP VIEW
(Not to Scale)
MR 3
4 WDI
Figure 2. ADM823 Pin Configuration
RESET 1
5 VCC
ADM824
GND 2 TOP VIEW
(Not to Scale)
RESET 3
4 WDI
Figure 3. ADM824 Pin Configuration
Preliminary Technical Data
RESET 1
5 VCC
ADM825
GND 2 TOP VIEW
(Not to Scale)
RESET 3
4 MR
Figure 4. ADM825 Pin Configuration
Table 4. Pin Function Descriptions
Pin. No. Mnemonic
1 RESET
2 GND
3 MR (ADM823)
RESET (ADM824/ADM825)
4 WDI (ADM823/ADM824)
MR (ADM825)
5 VCC
Description
Push-Pull Active-Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH.
Ground.
Manual Reset Input. This is an active-low input which, when forced low for at least 1µs, generates
a reset. It features a 52 kinternal pull-up.
Active-High, Push-Pull Reset Output.
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.
Manual Reset Input.
Power Supply Voltage Being Monitored.
Rev.PrB | Page 6 of 10

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