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ADM708AR bảng dữ liệu(PDF) 1 Page - Analog Devices |
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ADM708AR bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 8 page 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 & WATCHDOG TIMEBASE RESET GENERATOR MR VCC 250 A VCC WATCHDOG TIMER 4.65V* 1.25V 1.25V 4.65V* POWER-FAIL INPUT (PFI) POWER-FAIL OUTPUT ( PFO) RESET *VOLTAGE REFERENCE = 4.65V (ADM707), 4.40V (ADM708) ADM707/ ADM708 RESET GENERATOR MR VCC 250 A VCC RESET REV. B 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 Low Cost P Supervisory Circuits ADM705–ADM708 FEATURES Guaranteed RESET Valid with V CC = 1 V 190 A Quiescent Current Precision Supply-Voltage Monitor 4.65 V (ADM705/ADM707) 4.40 V (ADM706/ADM708) 200 ms Reset Pulsewidth Debounced TTL/CMOS Manual Reset Input ( MR) Independent Watchdog Timer—1.6 sec Timeout (ADM705/ADM706) Active High Reset Output (ADM707/ADM708) Voltage Monitor for Power-Fail or Low Battery Warning Superior Upgrade for MAX705–MAX708 Also Available in MicroSOIC Packages APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Critical P Monitoring Automotive Systems Critical P Power Monitoring GENERAL DESCRIPTION The ADM705–ADM708 are low cost µP supervisory circuits. They are suitable for monitoring the 5 V power supply/battery and can also monitor microprocessor activity. The ADM705/ADM706 provide the following functions: 1. Power-On Reset output during power-up, power-down and brownout conditions. The RESET output remains opera- tional with VCC as low as 1 V. 2. Independent watchdog timeout, WDO, that goes low if the watchdog input has not been toggled within 1.6 seconds. 3. A 1.25 V threshold detector for power-fail warning, low battery detection or to monitor a power supply other than 5V. 4. An active low debounced manual reset input ( MR). The ADM707/ADM708 differ in that: 1. A watchdog timer function is not available. 2. An active high reset output in addition to the active low output is available. Two supply-voltage monitor levels are available. The ADM705/ ADM707 generate a reset when the supply voltage falls below 4.65 V, while the ADM706/ADM708 require that the supply fall below 4.40 V before a reset is issued. All parts are available in 8-lead DIP and SOIC packages. The ADM707 and ADM708 are also available in space-saving microSOIC 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., 2000 |
Số phần tương tự - ADM708AR |
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Mô tả tương tự - ADM708AR |
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