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ADM6823WART-RL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM6823WART-RL7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 7 page Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23 Preliminary Technical Data ADM6821–ADM6825 Rev. PrA 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. Specifications subject to change without notice. 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES Precision Low Voltage Monitoring down to 1.8V 9 Reset Threshold Options: 1.58V to 4.63V 140ms (Min) Reset Timeout Watchdog Timer with 1.6s Timeout Manual Reset Input Reset Output Stages Push-Pull Active-Low Open-Drain Active-Low Push-Pull Active-High Low Power Consumption (3µA) Guaranteed Reset Output valid to VCC=1V Power Supply Glitch Immunity Specified from -40°C to +125°C 5-Lead SOT-23 Package APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Portable Equipment GENERAL DESCRIPTION The ADM6821-ADM6825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power-on-reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by means of an external push-button, through a manual reset input. The three parts feature different combinations of watchdog input, manual reset input and output stage configuration, as shown in table 1. FUNCTIONAL BLOCK DIAGRAM RESET GENERATOR MR DEBOUNCE GND RESET VCC VREF VCC ADM6821 WATCHDOG DETECTOR WDI Each part is available in a choice of 9 reset threshold options ranging from 1.58V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively. The ADM6821-ADM6825 are available in 5-lead SOT-23 packages and typically consume only 3µA, making them suitable for use in low power portable applications. Table 1. Selection Table Output Stage Part No. Watchdog Timer Manual Reset RESET RESET ADM6821 Yes Yes - Push-Pull ADM6822 Yes Yes Open-Drain - ADM6823 Yes Yes Push-Pull - ADM6824 Yes - Push-Pull Push-Pull ADM6825 - Yes Push-Pull Push-Pull |
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