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ADM803MAKS-REEL Datasheet(PDF) 1 Page - Analog Devices |
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ADM803MAKS-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page REV. C 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 rights of third parties that may result from its use. No 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. ADM803/ADM809/ADM810 Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23 FEATURES Specified over Temperature Low Power Consumption (17 A) Precision Voltage Monitor: 2.5 V, 3 V, 3.3 V, 5 V Options Reset Assertion Down to 1 V VCC 140 ms Min 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 DIAGRAM VREF VCC RESET GENERATOR 240ms RESET (RESET) GND ADM809 /ADM810 VREF VCC RESET GENERATOR 240ms ADM803 RESET GND RESET RESET INPUT GND GND VCC VCC MICROPROCESSOR SYSTEM ADM803 /ADM809 VCC *RPULL-UP *ADM803 ONLY Figure 1. Typical Operating Circuit GENERAL DESCRIPTION The ADM803/ADM809/ADM810 supervisory circuits monitor the power supply voltage in microprocessor systems. They pro- vide 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 opera- tional with VCC as low as 1 V. The ADM803 and ADM809 provide an active low reset signal ( RESET), while 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. Refer to Table I. 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 it suitable for low power portable equipment. The ADM803 is available in a 3-lead SC70; the ADM809/ADM810 is available in 3-lead SOT-23 and SC70 packages. |
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