Static information storage and retrieval – Read only systems – Fusible
Patent
1985-03-15
1987-11-17
Fears, Terrell W.
Static information storage and retrieval
Read only systems
Fusible
365 94, G11C 1100
Patent
active
047078065
ABSTRACT:
A device connected between first and second voltage feed lines includes an information storing circuit having a fuse for storing information by blowing or not blowing the fuse, a voltage level conversion circuit connected to at least one of the first and second voltage feed lines and outputting a voltage lower than a voltage between the first and second voltage feed lines to the information storing circuit, and a circuit connected between the first and second voltage feed lines, for outputting a detection signal in response to a voltage value at the fuse in the information storing circuit to which the voltage is applied from the voltage level conversion circuit and which voltage value is varied with the blown or unblown state of the fuse.
In a normal operation, the voltage output from the voltage level conversion circuit can be set as low as possible to restrain electromigration caused at the vicinity of the blown portion of the fuse to which the voltage is applied, but higher than the threshold voltage of the information detection circuit.
REFERENCES:
patent: 4250570 (1981-02-01), Tsang et al.
patent: 4432070 (1984-02-01), Moss
patent: 4592025 (1986-05-01), Takemae
Fujii Yasuhiro
Horii Takashi
Nakano Masao
Nakano Tomio
Ogawa Junji
Fears Terrell W.
Fujitsu Limited
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