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ADM706SAN Datasheet(PDF) 1 Page - Analog Devices |
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ADM706SAN Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page FUNCTIONAL BLOCK DIAGRAMS REV. A 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 +3 V, Voltage Monitoring P Supervisory Circuits FEATURES Precision Supply-Voltage Monitor +2.63 V (ADM706P/R, ADM708R) +2.93 V (ADM706S, ADM708S) +3.08 V (ADM706T, ADM708T) 100 A Quiescent Current 200 ms Reset Pulsewidth Debounced Manual Reset Input ( MR) Independent Watchdog Timer—1.6 sec Timeout (ADM706x) Reset Output Active High (ADM706P) Active Low (ADM706R/S/T) Both Active High and Active Low (ADM708R/S/T) Voltage Monitor for Power-Fail or Low Battery Warning Guaranteed RESET Valid with V CC = 1 V Superior Upgrade for MAX706P/R/S/T, MAX708R/S/T APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Critical P Monitoring Automotive Systems Battery Operated Systems Portable Instruments GENERAL DESCRIPTION The ADM706P/R/S/T and the ADM708R/S/T microprocessor supervisory circuits are suitable for monitoring either 3 V or 3.3 V power supplies. The ADM706P/R/S/T provide the following functions: 1. Power-supply monitoring circuitry which generates a Reset output during power-up, power-down and brownout condi- tions. The reset output remains operational with VCC as low as 1 V. 2. Independent watchdog monitoring circuitry which is acti- vated if the watchdog input has not been toggled within 1.6 seconds. 3. A 1.25 V threshold detector for power fail warning, low bat- tery detection, or to monitor an additional power supply. 4. An active low debounced manual reset input ( MR). The ADM706R, ADM706S, ADM706T are identical except for the reset threshold monitor levels which are 2.63 V, 2.93 V, and 3.08 V respectively. The ADM706P is identical to the ADM706R in that the reset threshold is 2.63 V. It differs only in that it has an active high reset output. ADM706P/R/S/T, ADM708R/S/T The ADM708R/S/T provide the same functionality as the ADM706R/S/T and only differ in that: 1. A watchdog timer function is not available. 2. An active high reset output (RESET) in addition to the active low ( RESET) output is available. All parts are available in 8-lead DIP and narrow SOIC packages. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 WATCHDOG TRANSITION DETECTOR WATCHDOG TIMER 1.25V VREF* WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) POWER FAIL OUTPUT ( PFO) WATCHDOG OUTPUT( WDO) RESET, (P = RESET) *VOLTAGE REFERENCE = 2.63V (P/R), 2.93V (S), 3.08V (T) ADM706 RESET & WATCHDOG TIMEBASE RESET GENERATOR MR VCC 70 A VCC 1.25V VREF* POWER FAIL INPUT (PFI) POWER FAIL OUTPUT ( PFO) RESET *VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T) ADM708 RESET GENERATOR MR VCC 70 A VCC RESET |
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