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ADM6822TART-RL7 PDF预览

ADM6822TART-RL7

更新时间: 2024-11-05 04:04:39
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亚德诺 - ADI 监控
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7页 132K
描述
Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23

ADM6822TART-RL7 数据手册

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Low Voltage Supervisory Circuits with  
Watchdog & Manual Reset in 5-Lead SOT-23  
Preliminary Technical Data  
ADM6821–ADM6825  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Precision Low Voltage Monitoring down to 1.8V  
9 Reset Threshold Options:  
1.58V to 4.63V  
V
CC  
140ms (Min) Reset Timeout  
Watchdog Timer with 1.6s Timeout  
Manual Reset Input  
ADM6821  
VCC  
RESET  
GENERATOR  
RESET  
Reset Output Stages  
VREF  
Push-Pull Active-Low  
Open-Drain Active-Low  
MR  
DEBOUNCE  
Push-Pull Active-High  
WATCHDOG  
DETECTOR  
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  
GND  
WDI  
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.  
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  
ADM6822  
ADM6823  
ADM6824  
ADM6825  
Yes  
Yes  
Yes  
Yes  
-
Yes  
Yes  
Yes  
-
-
Push-Pull  
Open-Drain  
Push-Pull  
Push-Pull  
Push-Pull  
-
-
Push-Pull  
Push-Pull  
Yes  
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  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  

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