Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP Data Sheet ADM811/ADM812 FEATURES FUNCTIONAL BLOCK DIAGRAM Superior upgrade for MAX811/MAX812 ADM811/ADM812 Specified over temperature V CC RESET RESET/RESET Low power consumption: 5 A typical GENERATOR V REF Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options Reset assertion down to 1 V CC MR DEBOUNCE GND Power-on reset: 140 ms minimum RESET Logic low output (ADM811) Figure 1. Logic high RESET output (ADM812) Built-in manual reset 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. The V V CC CC ADM811/ADM812 are designed to monitor six different ADM811 MICROPROCESSOR SYSTEM voltages, each allowing a 5% or 10% degradation of standard MR RESET RESET PSU voltages before a reset occurs. These voltages have been 100k selected for the effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V GND GND supply voltage levels. Included in this circuit is a debounced manual reset input. Figure 2. Typical ADM811 Operating Circuit 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 are operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system. Rev. G Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2013 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 00092-002 00092-001ADM811/ADM812 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Reset Thresholds ...........................................................................7 Applications ....................................................................................... 1 Reset Output ..................................................................................7 Functional Block Diagram .............................................................. 1 Manual Reset ..................................................................................7 General Description ......................................................................... 1 Glitch Immunity ............................................................................7 Revision History ............................................................................... 2 Interfacing to Other Devices ............................................................8 Specifications ..................................................................................... 3 Output .............................................................................................8 Absolute Maximum Ratings ............................................................ 4 Benefits of a Very Accurate Reset Threshold ............................8 ESD Caution .................................................................................. 4 Ensuring a Valid RESET/Reset Output Down to V = 0 V....8 CC Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ..........................................................................9 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 10 Circuit Information .......................................................................... 7 REVISION HISTORY 3/13Rev. F to Rev. G 1/03Rev. A to Rev. B Changes to Pin 4 Description Table 3 ........................................... 5 Added ADM812 ................................................................. Universal Updated Outline Dimensions ......................................................... 9 Changes to Specifications ................................................................. 2 Changes to Ordering Guide .......................................................... 10 Changes to Ordering Guide ............................................................. 3 Changes to Pin Configuration ......................................................... 4 8/09Rev. E to Rev. F Changes to Pin Function Description ............................................ 4 Changes to Ordering Guide .......................................................... 10 Additions to Table I ........................................................................... 6 5/08Rev. D to Rev. E Changes to Manual Reset section .................................................... 6 Changes to Table 2 ............................................................................ 4 5/02Rev. 0 to Rev. A Changes to Outline Dimensions ..................................................... 9 Deletion of ADM812.......................................................... Universal Changes to Ordering Guide .......................................................... 10 5/06Rev. C to Rev. D Changes to Ordering Guide ............................................................ 9 2/03Rev. B to Rev. C Changes Features .............................................................................. 1 Changes to General Description .................................................... 1 Changes to Specifications ................................................................ 2 Removed Note 2 from Ordering Guide ......................................... 3 Changes to Pin Function Descriptions .......................................... 4 Removed Note from Table I ........................................................... 6 Rev. G Page 2 of 12