Semiconductor memory device having a refresh function and a meth

Details Semiconductor memory device having a refresh function and a meth Semiconductor memory device having a refresh function and a meth

1998-01-30

1999-12-07

Nelms, David

Static information storage and retrieval

Read/write circuit

Data refresh

36523003, 365194, G11C 700

Patent

active

059994711

ABSTRACT:
A refresh method for a semiconductor memory device reduces the magnitude of the peak current drawn from the power supply. Multiple memory cells coupled to a plurality of word lines are refreshed at one time in order to reduce stand-by power consumption in the refresh mode. Such refresh mode can include automatic refresh or self refresh modes. A plurality of word lines are selected and multiple bit line sense amplifiers corresponding to the selected word lines are activated for the refresh operation. The selected plurality of bit line sense amplifiers are divided into two or more groups and the points in time at which the bit line sense amplifiers are enabled are different for each group. The selected word line and the selected bit line sense amplifiers are then disabled. Thus, the magnitude of the peak current is reduced by dispersing the points in time at which the bit line sense amplifiers are enabled, thereby preventing system misoperation by excessive peak currents in a battery powered system.

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patent: 5719815 (1998-02-01), Takahashi et al.
patent: 5831921 (1998-11-01), Tsukude

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