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ADM708RAR bảng dữ liệu(PDF) 1 Page - Analog Devices |
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1 / 16 page 3 V, Voltage Monitoring Microprocessor Supervisory Circuits ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1995–2008 Analog Devices, Inc. All rights reserved. FEATURES Precision supply voltage monitor 2.63 V (ADM706P, ADM706R, ADM708R) 2.93 V (ADM706S, ADM708S) 3.08 V (ADM706T, ADM708T) 100 μA quiescent current 200 ms reset pulse width Debounced manual reset input (MR) Independent watchdog timer 1.6 second timeout (ADM706x) Reset output Active high (ADM706P) Active low (ADM706R, ADM706S, ADM706T) Both active high and active low (ADM708R, ADM708S, ADM708T) Voltage monitor for power-fail or low battery warning Guaranteed RESET valid with VCC = 1 V Superior upgrade for MAX706P/R/S/T, MAX708R/S/T APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Critical microprocessor monitoring Battery-operated systems Portable instruments FUNCTIONAL BLOCK DIAGRAMS WATCHDOG TRANSITION DETECTOR 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) ADM706P/ADM706R/ ADM706S/ADM706T WATCHDOG TIMER RESET AND WATCHDOG TIMEBASE RESET GENERATOR MR VCC 70μA VCC VREF* 1.25V Figure 1. ADM706P/ADM706R/ADM706S/ADM706T 1.25V INPUT (PFI) * VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T) POWER-FAIL RESET RESET GENERATOR MR VCC 70μA VCC RESET VREF* POWER-FAIL OUTPUT (PFO) ADM708R/ADM708S/ ADM708T Figure 2. ADM708R/ADM708S/ADM708T GENERAL DESCRIPTION The ADM706P/ADM706R/ADM706S/ADM706T and the ADM708R/ADM708S/ADM708T microprocessor supervisory circuits are suitable for monitoring either 3 V or 3.3 V power supplies. The ADM706P/ADM706R/ADM706S/ADM706T provide power-supply monitoring circuitry that generate a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1 V. Independent watchdog monitoring circuitry is also provided. This is activated if the watchdog input has not been toggled within 1.6 seconds. In addition, there is a 1.25 V threshold detector for power-fail warning, low battery detection, or to monitor an additional power supply. An active low debounced MR input is also included. The ADM706R, ADM706S, and 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. The ADM708R/ADM708S/ADM708T provide similar functio- nality as the ADM706R/ADM706S/ADM706T and only differ in that a watchdog timer function is not available. Instead, an active high reset output (RESET) is provided in addition to the active low (RESET) output. All parts are available in narrow 8-lead PDIP and 8-lead SOIC packages. |
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