Supply Voltage Supervisor w/Watchdog Input and Manual Reset
The UM706xS/UM708xS/UM813xS series are cost effective system power supply supervisory
circuits designed to monitor the power supplies in digital systems.
The UM706xS provides power-supply monitoring circuitry that generates a reset output during
power-up, power-down, and brownout conditions. The reset output remains operational with VCC
as low as 1V. Independent watchdog monitoring circuitry is also provided. This is activated if the
watchdog input has not been toggled within 1.6 seconds. In addition, there is a 1.25V threshold
detector for power-fail warning, low battery detection, or to monitor an additional power supply.
An active low debounced manual reset input is also included.
The UM708xS is the same as the UM706xS, except an active-high reset is substituted for the
watchdog timer. The UM813xS is the same as the UM706xS, except RESET is provided instead
of RESET. All parts are available in a small outline SOP8 package.
z Applications Using DSPs, Microcontrollers z Wide Operation Voltage Range of 1V to
z Programmable Controls
z Correct Logic Output Guaranteed to
z Embedded Systems
z Precision Supply-Voltage Monitor: 2.63V,
z Industrial Equipments
2.93V, 3.08V, 4.38V, 4.63V
z Intelligent Instruments
z 200ms Reset Pulse Width
z Wireless Communications Systems
z Independent Watchdog Timer-1.6s Timeout
z Active-High Reset Output (UM708xS,
z Voltage Monitor for Power-Fail or
z Temperature Range: -40°C to +85°C
z Supply Current of 80μA (Typ)
XX: Week Code
http://www.union-ic.com Rev.08 Nov.2016