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Circuit for covering initial conditions when starting-up an integrated circuit device
Power-on reset circuit for resetting semiconductor integrated circuit Patent #: 5812001
ApplicationNo. 10242880 filed on 09/12/2002
US Classes:327/143, Responsive to power supply327/198, Initializing, resetting, or protecting a steady state condition327/227, Monostable327/546With field-effect transistor
ExaminersPrimary: Callahan, Timothy P.
Assistant: Englund, Terry L.
Attorney, Agent or Firm
Foreign Patent References
International ClassesH03K 1722
AbstractA circuit includes a second switching unit, a first switching unit that is connected to and selectively actuates the second switching unit, and a capacitive voltage divider including first, second and third capacitances connected in series. The first and second switching units are connected respectively to first and second junctions between the first and second and the second and third capacitances respectively. An associated method involves applying a supply voltage to the voltage divider so as to charge the first and second junctions, discharging the first junction through the first switching unit, which, dependent on the voltage of the first junction, selectively actuates the second switching unit to supply an additional charging current to the second junction. A time-limited signal such as a power-on reset signal is tapped from the first or second switching unit or from the second junction. Thereafter, the circuit draws no further current.