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ADM708 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM708 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 12 page Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708 Rev. G 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Guaranteed RESET valid with VCC = 1 V 190 μA quiescent current Precision supply voltage monitor 4.65 V (ADM705/ADM707) 4.40 V (ADM706/ADM708) 200 ms reset pulse width Debounced TTL/CMOS manual reset input (MR) Independent watchdog timer (ADM705/ADM706) 1.60 sec timeout (ADM705/ADM706) Active high reset output (ADM707/ADM708) Voltage monitor for power-fail or low battery warning Superior upgrade for MAX705 to MAX708 APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Critical microprocessor supply monitoring FUNCTIONAL BLOCK DIAGRAMS WATCHDOG TRANSITION DETECTOR WATCHDOG INPUT (WDI) POWER-FAIL INPUT (PFI) POWER-FAIL OUTPUT (PFO) WATCHDOG OUTPUT (WDO) RESET *VOLTAGE REFERENCE = 4.65V (ADM705), 4.40V (ADM706) ADM705/ ADM706 RESET AND WATCHDOG TIMEBASE RESET GENERATOR MR VCC 250μA VCC WATCHDOG TIMER 4.65V* 1.25V Figure 1. ADM705/ADM706 1.25V POWER-FAIL INPUT (PFI) RESET * VOLTAGE REFERENCE = 4.65V (ADM707), 4.40V (ADM708) ADM707/ ADM708 RESET GENERATOR MR VCC 250μA VCC RESET 4.65V* POWER-FAIL OUTPUT (PFO) Figure 2. ADM707/ADM708 GENERAL DESCRIPTION The ADM705/ADM706/ADM707/ADM708 microprocessor supervisory circuits are suitable for monitoring 5 V power supplies/batteries and can also monitor microprocessor activity. The ADM705/ADM706 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 1.60 seconds. In addition, there is a 1.25 V threshold detector to warn of power-failures, to detect low battery conditions, or to monitor an additional power supply. An active low, debounced manual reset input (MR) is also included. The ADM705 and ADM706 are identical except for the reset threshold monitor levels, which are 4.65 V and 4.40 V, respectively. The ADM707 and ADM708 provide a similar functionality to the ADM705 and ADM706 and only differ in that a watchdog timer function is not available. Instead, an active high reset output (RESET) is available as well as the active low reset output (RESET). The ADM707 and ADM708 are identical except for the reset threshold monitor levels, which are 4.65 V and 4.40 V, respectively. All parts are available in narrow 8-lead PDIP and 8-lead SOIC packages. |
Podobny numer części - ADM708_15 |
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Podobny opis - ADM708_15 |
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