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ADM812

更新时间： 2024-11-01 22:53:35
品牌 Logo 应用领域
亚德诺 - ADI 微处理器监控
页数 文件大小 规格书
6页 87K
描述
Microprocessors Supervisory Circuit in 4-Lead SOT-143

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Microprocessors  
Supervisory Circuit in 4-Lead SOT-143  
a
ADM811/ADM812  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Superior Upgrade for MAX811/MAX812  
Specified Over Temperature  
Low Power Consumption (5 ␮A Typ)  
ADM811/ADM812  
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options  
Reset Assertion Down to 1 V VCC  
140 ms Min Power-On Reset  
V
CC  
RESET  
GENERATOR  
RESET/RESET  
V
REF  
Logic Low RESET Output (ADM811)  
Logic High RESET Output (ADM812)  
Built-In Manual Reset  
DEBOUNCE  
MR  
GND  
APPLICATIONS  
Microprocessor Systems  
Controllers  
Intelligent Instruments  
Automotive Systems  
Safety Systems  
Portable Instruments  
GENERAL DESCRIPTION  
The ADM811/ADM812 are reliable voltage monitoring devices  
suitable for use in most voltage monitoring applications.  
V
V
CC  
CC  
␮P  
SYSTEM  
The ADM811/ADM812 are designed to monitor five different  
voltages, each allowing for a 5% or 10% degradation of standard  
PSU voltages before a reset occurs. These voltages have been  
selected for the effective monitoring of +3 V, +3.3 V and +5 V  
supply voltage levels.  
ADM811  
MR  
RESET  
RESET  
100k⍀  
GND  
GND  
Included in this circuit is a debounced Manual Reset input.  
Reset can be activated using an electrical switch (or an input  
from another digital device) or by a degradation of the supply  
voltage. The Manual Reset function is very useful especially if  
the circuit in which the ADM811/ADM812 is operating enters  
into a state that can only be detected by the user. Allowing the  
user to manually reset a system can reduce the damage or dan-  
ger that could be otherwise caused by an out-of-control or  
locked up system.  
Figure 1. Typical Operating Circuit  
REV. 0  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
123456

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