US 7,397,720 B2 | ||
Semiconductor storage device including electrical fuse module | ||
Shinichi Sumi, Hyogo (Japan); Hirohito Kikukawa, Osaka (Japan); Yasuhiro Agata, Osaka (Japan); Masanori Shirahama, Shiga (Japan); Toshiaki Kawasaki, Osaka (Japan); Ryuji Nishihara, Osaka (Japan); and Yasue Yamamoto, Osaka (Japan) | ||
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan) | ||
Filed on Aug. 09, 2006, as Appl. No. 11/501,039. | ||
Claims priority of application No. 2005-232687 (JP), filed on Aug. 11, 2005. | ||
Prior Publication US 2007/0058411 A1, Mar. 15, 2007 | ||
Int. Cl. G11C 17/18 (2006.01); G11C 17/00 (2006.01) |
U.S. Cl. 365—225.7 [365/96] | 5 Claims |
1. A semiconductor storage device comprising an electrical fuse module,
the electrical fuse module comprising electrical fuse blocks of a plurality of stages each including a plurality of electrical
fuse cores in each of which programming can be performed by passing current through a fuse element and melting the fuse element,
the electrical fuse core including a switch which is driven by input of a program enable signal for enabling the programming
and a data signal for the programming and passes current through the fuse element to perform programming,
the electrical fuse block including:
a program shift register block made up of shift registers which are disposed for the respective electrical fuse cores, sequentially
transmit the program enable signal, and output the program enable signal to the switches of the electrical fuse cores, and
a transmission circuit which sequentially transmits the program enable signal to the shift registers in the program shift
register block when performing programming according to a programming decision signal for determining whether or not programming
is necessary for the electrical fuse core, outputs the program enable signal to the switches of the electrical fuse cores
to perform programming, and transmits the program enable signal to the electrical fuse block of a subsequent stage, the transmission
circuit causing, when not performing programming, the program enable signal to skip the shift registers in the program shift
register block and transmitting the program enable signal to the electrical fuse blocks of the subsequent and later stages.
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