ADM8691 Microprocessor Supervisory Circuit

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 mP 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. Power-on reset output during power-up, power-down and brownout conditions. The RESET output remains operational with VCC as low as 1 V. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic. A reset pulse if the optional watchdog timer has not been toggled within a specified time. A 1.3 V threshold detector for power fail warning, low battery detection or to monitor a power supply other than +5 V. Write protection of CMOS RAM or EEPROM. Adjustable reset and watchdog timeout periods. Separate watchdog timeout, backup battery switchover, and low VCC status outputs.

The ADM8690, ADM8692 and ADM8694 are available in 8-pin DIP packages and provide:

The ADM8691, ADM8693 and ADM8695 are available in 16-pin DIP and small outline packages (including TSSOP) and provide three additional functions:

Features and Benefits
  • Upgrade for the ADM690, ADM691, ADM695 and for the MAX690, MAX691, 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 Ω normal, 7 Ω in backup
  • High current drive: 100 mA
  • Watchdog timer: 100 ms, 1.6 sec, or adjustable
  • Standby current: 400 nA
  • Automatic battery backup power switching
  • Extremely fast gating of chip enable signals (3 ns)
  • Voltage monitor for power fail
  • Available in TSSOP package
Power Management
Data Sheets
Documentnote
ADM8690/ADM8691/ADM8695: Microprocessor Supervisory Circuits Data Sheet (Rev. C)PDF 357 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
ADM8691ANZ Production16 ld PDIPOTH 25-40 to 85C4.083.64Y
ADM8691ARN Last Time Buy16 ld SOICOTH 48-40 to 85C00N
ADM8691ARNZ Production16 ld SOICOTH 48-40 to 85C4.083.64Y
ADM8691ARUZ Last Time Buy16 ld TSSOPOTH 96-40 to 85C3.963.53Y
ADM8691ARWZ Production16 ld SOIC - WideOTH 47-40 to 85C3.963.53Y
Reference Materials
ADM8690/ADM8691/ADM8695: Microprocessor Supervisory Circuits Data Sheet (Rev. C) adm8690
Supervisory Devices Complementary Parts Guide for Altera FPGAs adm690
Supervisory Devices Complementary Parts Guide for Xilinx FPGAs adm690
Voltage Monitoring Products Applications Guide adm6317