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ADM809-5L Datasheet(PDF) 1 Page - Analog Devices |
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ADM809-5L Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page Microprocessor Supervisory Circuit ADM809-5L/ADM809-5S Rev. B 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Specified over temperature Low power consumption: 17 μA Precision voltage monitor: 3 V, 5 V options Reset assertion down to 1 V VCC 30 ms minimum power-on reset Logic low RESET output Available in SOT-23 and SC70 packages APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Automotive systems GENERAL DESCRIPTION The supervisory circuit of the ADM809-5L/ADM809-5S monitors the power supply voltage in microprocessor systems. It provides a reset output during power-up, power-down, and brownout conditions. On power-up, an internal timer holds reset asserted for 55 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 ADM809-5L/ADM809-5S provide an active low reset signal (RESET). The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC. The ADM809-5L/ADM809-5S consume only 17 μA, making them suitable for low power, portable equipment. FUNCTIONAL BLOCK DIAGRAM ADM809-5L/ ADM809-5S GND RESET GENERATOR 55ms RESET VCC VREF Figure 1. TYPICAL OPERATING CIRCUIT GND GND VCC VCC ADM809-5L/ ADM809-5S MICROPROCESSOR SYSTEM VCC RESET INPUT RESET Figure 2. |
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