Invention Grant
- Patent Title: Semiconductor memory device
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Application No.: US633845Application Date: 1990-12-26
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Publication No.: US5267205APublication Date: 1993-11-30
- Inventor: Mitsuhiro Hamada
- Applicant: Mitsuhiro Hamada
- Applicant Address: JPX Tokyo
- Assignee: NEC Corporation
- Current Assignee: NEC Corporation
- Current Assignee Address: JPX Tokyo
- Priority: JPX1-337436 19891225
- Main IPC: G11C7/06
- IPC: G11C7/06 ; G11C11/401 ; G11C11/413 ; G11C29/00 ; G11C29/04 ; G11C7/00 ; G11C11/40
Abstract:
A semiconductor memory device with a redundant configuration according to the present invention includes a roll call circuit which turns an output signal of a sense amplifier compulsorily to a signal of a predetermined logical level when a portion constituting the redundant configuration is accessed, and turns an output signal of the output control circuit to that of the same predetermined logical level when a write instruction is given outside a normal level. Whether a spare memory cell is accessed can be checked in every output and the redundant configuration can operate with stability.
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