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ADM809RARTZ-REEL2 Datasheet(PDF) 1 Page - Analog Devices |
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ADM809RARTZ-REEL2 Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23 ADM803/ADM809/ADM810 Rev. H Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved. FEATURES Specified over temperature Low power consumption: 17 μA Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options Reset assertion down to 1 V VCC 140 ms minimum power-on reset Open-drain RESET output (ADM803) Push-pull RESET output (ADM809) Push-pull RESET output (ADM810) SC70 and SOT-23 packages APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Automotive systems FUNCTIONAL BLOCK DIAGRAMS GND GND VCC VCC *RPULL-UP ADM803/ADM809 MICROPROCESSOR SYSTEM VCC *ADM803 ONLY RESET INPUT RESET ADM803 GND RESET GENERATOR 240ms RESET RESET (RESET) GND RESET GENERATOR 240ms ADM809/ADM810 VCC VREF VCC VREF Figure 1. GENERAL DESCRIPTION The ADM803/ADM809/ADM810 supervisory circuits monitor the power supply voltage in microprocessor systems. They provide a reset output during power-up, power-down, and brownout conditions. On power-up, an internal timer holds reset asserted for 240 ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCC as low as 1 V. The ADM803 and ADM809 provide an active low reset signal (RESET), whereas 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. Seven reset threshold voltage options are available, suitable for monitoring a variety of supply voltages (see Table 3). The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC. The ADM803/ADM809/ADM810 consume only 17 μA, making them suitable for low power, portable equipment. The ADM803 is available in a 3-lead SC70; the ADM809/ADM810 are available in 3-lead SOT-23 and 3-lead SC70 packages. |
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