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ADM809JART-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM809JART-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 6 page REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADM809/ADM810 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 Microprocessor Supervisory Circuit in 3-Pin SOT-23 FUNCTIONAL BLOCK DIAGRAM VREF VCC RESET GENERATOR 240ms ADM809/ADM810 RESET (RESET) GND FEATURES Superior Upgrade for MAX809/MAX810 Specified Over Temperature Low Power Consumption (17 A) Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options Reset Assertion Down to 1 V VCC 140 ms min Power-On Reset Logic Low RESET Output (ADM809) Logic High RESET Output (ADM810) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems GENERAL DESCRIPTION The 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 operational with VCC as low as 1 V. The ADM809 provides an active low reset signal ( RESET) while the ADM810 provides an active high signal (RESET) output. Six 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 ADM809/ADM810 consumes only 17 µA, making it suitable for low power portable equipment. It is packaged in a 3-pin SOT-23 package. RESET RESET INPUT GND GND VCC VCC µP SYSTEM ADM809 VCC Figure 1. Typical Operating Circuit |
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