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ADM8693 Datenblatt(PDF) 1 Page - Analog Devices |
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ADM8693 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 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 Microprocessor Supervisory Circuits ADM8690–ADM8695 FEATURES Upgrade for ADM690/ADM695, MAX690–MAX695 Specified Over Temperature Low Power Consumption (0.7 mW) Precision Voltage Monitor Reset Assertion Down to 1 V VCC Low Switch On-Resistance 0.7 Normal, 7 in Backup High Current Drive (100 mA) Watchdog Timer—100 ms, 1.6 s, or Adjustable 400 nA Standby Current Automatic Battery Backup Power Switching Extremely Fast Gating of Chip Enable Signals (3 ns) Voltage Monitor for Power Fail Available in TSSOP Package APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems FUNCTIONAL BLOCK DIAGRAMS ADM8691 ADM8693 ADM8695 4.65V1 RESET AND WATCHDOG TIMEBASE RESET GENERATOR WATCHDOG TRANSITION DETECTOR WATCHDOG TIMER 1.3V VOUT CEOUT LOW LINE RESET RESET WATCHDOG OUTPUT ( WDO) POWER FAIL OUTPUT ( PFO) VBATT VCC CEIN OSC IN OSC SEL WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) BATT ON 1VOLTAGE DETECTOR = 4.65V (ADM8691, ADM8695) 4.40V (ADM8693) ADM8690 ADM8692 ADM8694 4.65V1 VOUT RESET POWER FAIL OUTPUT ( PFO) VBATT VCC WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) 1VOLTAGE DETECTOR = 4.65V (ADM8690, ADM8694) 4.40V (ADM8692) 2RESET PULSE WIDTH = 50ms (AD8690, ADM8692) 200ms (ADM8694) WATCHDOG TRANSITION DETECTOR (1.6s) RESET GENERATOR2 1.3V One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 GENERAL DESCRIPTION The ADM8690–ADM8695 family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection and power failure warning. The complete family provides a variety of configurations to sat- isfy most microprocessor system requirements. The ADM8690, ADM8692 and ADM8694 are available in 8-pin DIP packages and provide: 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. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic. 3. A reset pulse if the optional watchdog timer has not been toggled within a specified time. 4. A 1.3 V threshold detector for power fail warning, low battery detection or to monitor a power supply other than +5 V. The ADM8691, ADM8693 and ADM8695 are available in 16-pin DIP and small outline packages (including TSSOP) and provide three additional functions: 1. Write protection of CMOS RAM or EEPROM. 2. Adjustable reset and watchdog timeout periods. 3. Separate watchdog timeout, backup battery switchover, and low VCC status outputs. The ADM8690–ADM8695 family is fabricated using an ad- vanced epitaxial CMOS process combining low power con- sumption (0.7 mW), extremely fast Chip Enable gating (3 ns) and high reliability. RESET assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is de- signed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need of an external pass transistor. |
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Ähnliche Beschreibung - ADM8693 |
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