Patent ID: 6717872
Filing Date: 2004-04-06
Classification: G11C

Abstract:
A charging circuit for charging a prescribed load circuit to a prescribed potential, the charging circuit comprising:a charging driving circuit connected to the load circuit for supplying a charging signal to the load circuit from an output end of the charging driving circuit; a time constant circuit for receiving the charging signal changing a time constant of the charging signal and outputting a transition signal having a prescribed transition time period; a control circuit for outputting a control signal for setting a time constant of the time constant circuit in accordance with the prescribed load circuit; a voltage detection circuit for detecting that the transition signal output from the time constant circuit has reached the prescribed potential and outputting a detection signal; and a delay and inversion circuit for delaying, and inverting a logic level of, an externally input charging control signal, and outputting a delay signal, wherein the charging driving circuit starts a charging operation in accordance with the delay signal output from the delay and inversion circuit, and terminates the charging operation in accordance with the detection signal output from the voltage detection circuit.