Reihen-Adressenauswahlsignal-Eingangspuffer zur Vermeidung von Latch-Up-Zuständen

The row address strobe signal input buffer, or "chain pre-charge" circuit, includes a pad receiving a row address strobe signal ( &upbar& R). A Schmitt trigger receives the &upbar& R signal from the pad, and is responsive to a start-up signal. A control section responds to the start-up signal and the output thereof is connected to the output of the Schmitt trigger. A NAND gate and inverters are connected to the output of the control section. A first pre-charge circuit, connected between the pad and the Schmitt trigger, prevents a floating state at the time of initial power source voltage supply. A second pre-charge circuit, connected to an input of one of the inverters which provides the output of the row address strobe signal input buffer, also helps prevent the floating state.