ADM691 Datasheet | Analog Devices

FEATURES Superior Upgrade for MAX690- MAX695 Specified Over Temperature Low Power Consumption (5 m W) Precision Voltage Monitor Reset Assertion Down to 1 V V CC Low Switch On-Resistance 1.5 ⍀ Normal, 20 ⍀ in Backup High Current Drive (100 m A) Watchdog Timer- 100 ms, 1.6 s, or Adjustable 600 n A Standby Current Automatic Battery Backup Power Switching Extremely Fast Gating of Chip Enable Signals (5 ns) Voltage Monitor for Power Fail APPLICATIONS Microprocessor Systems puters Controllers Intelligent Instruments Automotive Systems GENERAL DESCRIPTION VBATT VBATT VCC Microprocessor Supervisory Circuits ADM690- ADM695 FUNCTIONAL BLOCK DIAGRAMS VOUT 4.65V 1 RESET GENERATOR 2 RESET WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) WATCHDOG TRANSITION DETECTOR (1.6s) ADM690 ADM692 ADM694 POWER FAIL OUTPUT (PFO) 1.3V 1 VOLTAGE 2 RESET DETECTOR = 4.65V (ADM690, ADM694) 4.40V (ADM692) PULSE WIDTH = 50ms (ADM690, ADM692) 200ms (ADM694) BATT ON The ADM690- ADM695 family of supervisory circuits offers plete 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 plete family provides a variety of configurations to satisfy most microprocessor system requirements. The ADM690, ADM692 and ADM694 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 operational 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 ADM691, ADM693 and ADM695 are available in 16-pin DIP and small outline packages and provide three additional functions....