Semiconductor memory device capable of operating at high...

Details Semiconductor memory device capable of operating at high... Semiconductor memory device capable of operating at high...

2006-12-26

2006-12-26

Phung, Anh (Department: 2824)

Static information storage and retrieval

Powering

C365S227000

Reexamination Certificate

active

07154802

ABSTRACT:
A monitor circuit for monitoring external potential EXTVDD and variable delay circuit determine the time interval in which signal ZODACT is being at the L level according to the potential level of external potential EXTVDD, and thus the supplying time of external potential EXTVDD can be dynamically changed. When external potential EXTVDD is at the upper limit of specification of product, the supplying time is short, thereby preventing overcharge of memory cells or bit lines. When external potential EXTVDD is at the lower limit of specification of product, the supplying time becomes longer, thereby ensuring a sufficient over-driving time interval. It is possible to ensure the reliability of the memory cells and perform the reading operation throughout the entire range of the specification of product of external potential EXTVDD. Therefore, it is possible to provide a semiconductor memory device capable of performing a reading operation at high speeds while ensuring the reliability.

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