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ADM824ZYKS-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADM824ZYKS-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 10 page Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 Preliminary Technical Data ADM823/ADM824/ADM825 Rev.PrB 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 owners. 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 2.5 V to 5 V power supply monitor 7 reset threshold options: 2.19 V to 4.63 V 140 ms (min) reset timeout Watchdog timer with 1.6s timeout (ADM823, ADM824) Manual reset input (ADM823, ADM825) Push-pull output stages: RESET (ADM823) RESET, RESET (ADM824/ADM825) Low power consumption (3 µA) Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity Specified over automotive temperature range 5-lead SC70 and SOT-23 packages APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Portable equipment FUNCTIONAL BLOCK DIAGRAM ADM823 VCC VCC MR GND WDI RESET RESET GENERATOR WATCHDOG DETECTOR DEBOUNCE VREF Figure 1. GENERAL DESCRIPTION The ADM823/ADM824/ADM825 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. Each part is available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (min) and 1.6s (typ), respectively. The ADM823/ADM824/ADM825 are available in 5-lead SC70 and SOT-23 packages and typically consume only 3 µA, making them suitable for use in low power portable applications. Table 1. Selection Table Output Stage Part No. Watchdog Timer Manual Reset RESET RESET ADM823 Yes Yes Push-Pull – ADM824 Yes – Push-Pull Push-Pull ADM825 – Yes Push-Pull Push-Pull |
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Similar Description - ADM824ZYKS-R7 |
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