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ADM6821 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADM6821
Description  Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM6821 Datasheet(HTML) 1 Page - Analog Devices

   
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Low Voltage Supervisory Circuits with
Watchdog & Manual Reset in 5-Lead SOT-23
Preliminary Technical Data
ADM6821–ADM6825
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 (3µA)
Guaranteed Reset Output valid to VCC=1V
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
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
VCC
VREF
VCC
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 3µA, 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


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