Static information storage and retrieval – Read/write circuit – Having fuse element
Reexamination Certificate
2007-03-06
2007-03-06
Nguyen, Tuan T. (Department: 2824)
Static information storage and retrieval
Read/write circuit
Having fuse element
C365S185050, C365S185190
Reexamination Certificate
active
10904401
ABSTRACT:
A method of using an e-fuse device is provided. The e-fuse device includes a poly-fuse having one end connected to a source/drain region of a MOS transistor and the other end biased to a voltage (VFS). In operation, a gate of the MOS transistor receives a step waveform pulse signal. The step waveform pulse signal encompasses a pre-heat voltage (Vp) at a first level during time period (T1-Tp) and a maximum input voltage (VIH) at a second level during time period (Tp-T2). The pre-heat voltage (Vp) is smaller than the maximum input voltage (VIH). The step waveform pulse signal is confined to a minimum input voltage (VIL) before T1and after T2. Preferably, the time period (T1-Tp) is longer than 5 μs.
REFERENCES:
patent: 5519654 (1996-05-01), Kato et al.
patent: 6178126 (2001-01-01), Kirihata et al.
patent: 6208549 (2001-03-01), Rao et al.
patent: 6570806 (2003-05-01), Bertin et al.
Hsu Winston
Nguyen Tuan T.
United Microelectronics Corp.
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