Patent Number: 7,710,790

Title: Semiconductor memory device and write control method thereof

Abstract: A semiconductor memory device comprise a word line, a bit line intersecting the word line, a memory element arranged at intersections of the word line and the bit line and having different required time for a write operation according to a logical value of write data, a write driver supplying a write current to the bit line, a write control circuit controlling operations of the write driver, and a timing signal generation circuit supplying a timing signal to the write control circuit. The timing signal has a waveform including a pulse indicating a time of starting supplying the write current when a first logical level is to be written, a pulse indicating a time of ending supplying the write current if the first logical level is to be written, and a pulse indicating one of a time of starting supplying the write current and a time of ending supplying the write current when a second logical level is to be written.

Inventors: Katagiri; Satoshi (Tokyo, JP)

Assignee: Elpida Memory, Inc.

International Classification: G11C 7/10 (20060101)

Expiration Date: 5/04/12018