Semiconductor memory device and system with redundant element

Details Semiconductor memory device and system with redundant element Semiconductor memory device and system with redundant element

2011-04-26

2011-04-26

Nguyen, Tuan T. (Department: 2824)

Static information storage and retrieval

Read/write circuit

Bad bit

C365S201000

Reexamination Certificate

active

07933159

ABSTRACT:
A semiconductor memory device includes a memory cell array, a redundant element, an address specifying circuit configured to select one of a plurality of addresses as a redundancy address in response to a switchover signal, a decoder circuit configured to select the redundant element in response to an externally applied address that matches the redundancy address selected by the address specifying circuit, and a test mode setting circuit configured to change the switchover signal in response to an externally applied input, thereby to cause the redundancy address assigned to the redundant element to be switched between different ones of the plurality of addresses.

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