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ADM691 Datasheet Microprocessor Supervisory Circuits

Manufacturer: Analog Devices

Overview: a.

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 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 satisfy most microprocessor system requirements.

Key Features

  • Superior Upgrade for MAX690.
  • MAX695 Specified Over Temperature Low Power Consumption (5 mW) 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 mA) Watchdog Timer.
  • 100 ms, 1.6 s, or Adjustable 600 nA Standby Current Automatic Battery Backup Power Switching Extremely Fast Gating of Chip Enable Signals (5 ns) Voltage Monitor for Power Fail.

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