Microprocessor Reset Circuits Data Sheet ADM1810 to ADM1813/ADM1815 to ADM1818 FEATURES FUNCTIONAL BLOCK DIAGRAMS Reliable low cost voltage monitor with reset output ADM1810/ADM1815 V CC Suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V power supply voltages RST Reset threshold levels: 4.62 V, 4.35 V, 3.06 V, 2.88 V, 2.55 V, V CC TOLERANCE 2.31 V, and 2.18 V typical BIAS 150ms Active high and low push-pull output choices: ADM1810, DELAY ADM1812, ADM1815, and ADM1817 TC GND REFERENCE Open-drain with internal pull-up resistor output choices: ADM1811, ADM1813, ADM1816, and ADM1818 Can be used with a manual push-button to generate a reset: ADM1811/ADM1816 ADM1813, ADM1818 V CC 5.5k Initialization of microprocessor systems with added safety RST Available in 3-lead SOT-23 and SC70 packages V CC TOLERANCE APPLICATIONS BIAS 150ms Microprocessor systems DELAY TC GND Computers REFERENCE Controllers Intelligent instruments Automotive systems ADM1812/ADM1817 V CC GENERAL DESCRIPTION RST The ADM181x range of voltage monitoring circuits is used in V CC any application where an electronic system needs to be reset TOLERANCE BIAS when a voltage increases above or below a predetermined value. 150ms DELAY Because of the reset delay time incorporated into the ADM181x TC GND REFERENCE series, these devices provide a safe startup for electronic systems. Before a system initializes, the power supply must stabilize. Using the ADM181x series ensures that there are typically 150 ms ADM1813/ADM1818 for the power supply to stabilize before the system resets and V CC safe system initialization begins. 5.5k RESET RST MONITOR The ADM181x series of microprocessor reset circuits are V CC available in low cost, space-saving SOT-23 and SC70 packages. TOLERANCE BIAS 150ms DELAY TC GND REFERENCE Figure 1. Rev. F 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 19992013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 00064-001ADM1810 to ADM1813/ADM1815 to ADM1818 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Theory of Operation .........................................................................7 General Description ......................................................................... 1 Timing Diagrams for All Devices ...............................................7 Functional Block Diagrams ............................................................. 1 ADM1813 and ADM1818 .............................................................7 Revision History ............................................................................... 2 ADM1810, ADM1812, ADM1815, and ADM1817 ....................7 Specif icat ions ..................................................................................... 3 ADM1811 and ADM1816 .............................................................7 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ..........................................................................8 ESD Caution .................................................................................. 4 Ordering Guide .............................................................................9 Pin Configurations and Function Descriptions ........................... 5 REVISION HISTORY 10/13Rev. E to Rev. F 2/03Rev. A to Rev. B. Changed Open-Drain to Open-Drain with Internal Pull-Up Edits to Features ................................................................................. 1 Resistor ............................................................................ Throughout Deleted Table I ................................................................................... 1 Updated Outline Dimensions ......................................................... 8 Edits to Specifications ....................................................................... 2 Changes to Ordering Guide ............................................................ 9 Edits to Absolute Maximum Ratings .............................................. 3 Edits to Ordering Guide ................................................................... 3 8/08Rev. D to Rev. E Added Typical Performance Characteristics ................................. 4 Changes to Table 3 ............................................................................ 5 Edits to ADM1813 AND ADM1818 section ................................. 5 Updated Outline Dimensions ......................................................... 8 Edits to ADM1810, ADM1812, ADM1815, and Changes to Ordering Guide ............................................................ 9 ADM1817 Section ............................................................................. 5 Edits to ADM1811 and ADM1816 Section ................................... 5 10/05Rev. C to Rev. D Updated Outline Dimensions .......................................................... 6 Updated Format .................................................................. Universal Added Figure 3 .................................................................................. 5 3/02Rev. 0 to Rev. A. Changes to Table 3 ............................................................................ 5 Addition of Table .............................................................................. 1 Updated Outline Dimensions ......................................................... 8 Edits to Ordering Guide ................................................................... 3 Edits to Ordering Guide .................................................................. 9 Addition of New Text to ADM1813 and ADM1818 Section ...... 4 9/03Rev. B to Rev. C. 4/99Revision 0: Initial Version Added SC70 ......................................................................... Universal Edits to Specifications ...................................................................... 2 Edits to Ordering Guide .................................................................. 4 Updated Outline Dimensions ......................................................... 7 Rev. F Page 2 of 12