Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23 Data Sheet ADM803/ADM809/ADM810 FEATURES FUNCTIONAL BLOCK DIAGRAMS Specified over temperature ADM803 Low power consumption: 17 A Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options V CC RESET RESET Reset assertion down to 1 V V GENERATOR CC V REF 240ms 140 ms minimum power-on reset Open-drain RESET output (ADM803) Push-pull RESET output (ADM809) GND Push-pull RESET output (ADM810) SC70 and SOT-23 packages ADM809/ADM810 APPLICATIONS RESET Microprocessor systems V CC RESET GENERATOR Computers (RESET) 240ms V REF Controllers Intelligent instruments GND V CC V V *R CC CC PULL-UP MICROPROCESSOR ADM803/ADM809 SYSTEM RESET RESET INPUT GND GND *ADM803 ONLY Figure 1. GENERAL DESCRIPTION The ADM803/ADM809/ADM810 supervisory circuits monitor Seven reset threshold voltage options are available, suitable for the power supply voltage in microprocessor systems. They monitoring a variety of supply voltages (see Table 3). provide a reset output during power-up, power-down, and The reset comparator features built-in glitch immunity, making brownout conditions. On power-up, an internal timer holds it immune to fast transients on VCC. reset asserted for 240 ms. This holds the microprocessor in a The ADM803/ADM809/ADM810 consume only 17 A, making reset state until conditions have stabilized. The reset output them suitable for low power, portable equipment. The ADM803 remains operational with V as low as 1 V. The ADM803 and CC is available in a 3-lead SC70 the ADM809/ADM810 are available ADM809 provide an active low reset signal (RESET), whereas in 3-lead SOT-23 and 3-lead SC70 packages. the ADM810 provides an active high signal (RESET) output. The ADM809 and ADM810 have push-pull outputs, whereas the ADM803 has an open-drain output, which requires an external pull-up resistor. Rev. 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Technical Support www.analog.com 03736-001ADM803/ADM809/ADM810 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configurations and Function Descriptions ............................5 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagrams ............................................................. 1 Interfacing to Other Devices ............................................................8 General Description ......................................................................... 1 Ensuring a Valid Reset Output Down to VCC = 0 V .................8 Revision History ............................................................................... 2 Benefits of an Accurate Reset Threshold ...................................8 Specif icat ions ..................................................................................... 3 Interfacing to Microprocessors with Multiple Interrupts ........8 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ..........................................................................9 ESD Caution .................................................................................. 4 Ordering Guide .......................................................................... 10 REVISION HISTORY 10/14Rev. H to Rev. I 5/03Rev. B to Rev. C. Changes to Applications Section .................................................... 1 Added ADM803 ................................................................. Universal Changes to Table 2 ............................................................................ 4 Changes to Features .......................................................................... 1 Updated Outline Dimensions ......................................................... 9 Changes to General Description ..................................................... 1 Changes to Ordering Guide .......................................................... 10 Changes to Figure 1 ........................................................................... 1 Changes to Specifications ................................................................. 2 8/08Rev. G to Rev. H Changes to Table I ............................................................................. 3 Added Figure 4 Renumbered Sequentially .................................. 5 Updated Ordering Guide ................................................................. 4 Changes to Figure 8 .......................................................................... 6 Updated Outline Dimensions ......................................................... 9 1/03Rev. A to Rev. B. Changes to Ordering Guide .......................................................... 10 Changes to Specifications ................................................................. 2 Changes to Table I ............................................................................. 3 9/06Rev. F to Rev. G Changes to Ordering Guide ............................................................. 4 Updated Outline Dimensions ......................................................... 9 Changes to TPCs 13, and TPC 7 ................................................... 5 Changes to Ordering Guide ............................................................ 9 Updated Outline Dimensions .......................................................... 7 6/05Rev. E to Rev. F. 10/02Rev. 0 to Rev. A. Addition of SC70 package ................................................. Universal Changes to Ordering Guide ............................................................ 4 Updated Outline Dimensions ......................................................... 9 Change to General Description ....................................................... 1 Changes to Specifications ................................................................. 2 2/05Rev. D to Rev. E. Changes to Absolute Maximum Ratings ........................................ 3 Changes to Ordering Guide ............................................................ 4 Change to Table I ............................................................................... 3 Change to Ordering Guide ............................................................... 4 2/05Rev. C to Rev. D. Change to TPC 1 ............................................................................... 5 Changes to Ordering Guide ............................................................ 4 Updated Outline Dimensions .......................................................... 7 Updated Outline Dimensions ......................................................... 8 4/97Revision 0: Initial Version Rev. I Page 2 of 11