Refresh for dynamic cells with weak retention

Details Refresh for dynamic cells with weak retention Refresh for dynamic cells with weak retention

2006-08-22

2006-08-22

Tran, Andrew Q. (Department: 2824)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S201000, C365S225700, C365S233100, C365S189120

Reexamination Certificate

active

07095669

ABSTRACT:
Methods and circuit configurations for utilizing memory cells having weak retention times are provided. For some embodiments, rows identified as having weak retention cells may be refreshed more often than “normal retention” cells. As an example, if a normal refresh period is TREF, weak retention cells may be refreshed every TREF/2 or TREF/4 (possibly depending on the actual measured retention time).

REFERENCES:
patent: 5148546 (1992-09-01), Blodgett
patent: 5329490 (1994-07-01), Murotani
patent: 5629898 (1997-05-01), Idei et al.
patent: 5654913 (1997-08-01), Fukushima et al.
patent: 0 790 620 (1997-08-01), None
patent: WO96/28825 (1996-09-01), None
PCT International Search Report dated Feb. 14, 2005.
PCT Written Opinion dated Feb. 14, 2005.

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