Initial firing method and phase change memory device for...

Details Initial firing method and phase change memory device for... Initial firing method and phase change memory device for...

2008-03-25

2008-03-25

Hur, J. H. (Department: 2824)

Static information storage and retrieval

Systems using particular element

Amorphous

C365S230060, C365S239000, C365S230030, C365S200000, C365S201000, C365S233100

Reexamination Certificate

active

11483477

ABSTRACT:
In a firing method of a phase change memory device and a phase change memory capable of effectively performing a firing operation, the phase change memory device includes a plurality of memory cell array blocks, a counter clock generation unit, a decoding unit, and a driving unit. Each memory cell array block has phase change memory cells. The counter clock generation unit outputs first through third counter clock signals in response to an external clock signal and a firing mode signal, wherein the first through third counter clock signals have different cycles. The decoding unit, in response to the first through third counter clock signals, outputs a block address which selects one of the plurality of memory cell array blocks, word line addresses which enable word lines of the selected memory cell array block, and a redundant word line address which enables a redundant word line of the selected memory cell array block. The driving unit applies a firing current to the memory cell array blocks in response to the firing mode signal. According to the phase change memory device and the initial firing method, the time taken to perform the initial firing operation can be reduced. In addition, since the numbers of the needed signals are minimized, a large number of chips on a single wafer can be simultaneously tested.

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patent: 2002/0080677 (2002-06-01), Watanabe et al.
patent: 2002/0176287 (2002-11-01), Hur et al.
patent: 98-28731 (1998-07-01), None

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