Semiconductor memory device

Static information storage and retrieval – Read/write circuit – Including signal clamping

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365182, G11C 1300

Patent

active

055769985

ABSTRACT:
An object of the present invention is to provide a semiconductor memory device having a function to efficiently limit a voltage amplitude of an I/O line pair 4 to protect cell data from destruction even when multiple selection, etc., occurs at a column gate 3. A semiconductor memory device 1 constituted by DRAM, etc., for transferring cell data amplified by a sense amplifier 2 to an I/O line pair 4 through a transfer gate 3, comprises an amplitude limiting means 5 for limiting the amplitude of a voltage, provided to the I/O line pair 4 in activation, wherein the amplitude limiting means 5 includes a first amplitude limiting circuit 51 having a predetermined operating range and a second amplitude limiting circuit 52 having an operating range different from the operating range of the first amplitude limiting circuit 51.

REFERENCES:
patent: 5504704 (1996-04-01), Sato et al.

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