| 摘要 |
PURPOSE: An oscillator is provided to improve driving capacity by preventing power consumption due to over-current according to operations of a memory cell. CONSTITUTION: An enable signal of a high state is inverted to the enables signal of a low state by the first to the third inverters(I41 to I43). The first PMOS transistor(P41) is turned on and the first NMOS transistor(N41) is turned off by the enable signal of the low state. The supply voltage is supplied to the first node(Q41) through the first PMOS transistor(P41). The supply voltage applied to the first node(Q41) is dropped by a resistance(R41). The supply voltage is dropped again by the third NMOS transistor(N43) connected between the first node(Q41) and the ground terminal(Vss). The fifth, the seventh, and the ninth NMOS transistors(N45,N47,N49) are turned on by the first, the second, and the third control signals.
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