18-01-2018 дата публикации
Номер: US20180019013A1
A semiconductor device with a memory unit of which the variations in the operation timing are reduced is provided. For example, the semiconductor device is provided with dummy bit lines which are arranged collaterally with a proper bit line, and column direction load circuits which are sequentially coupled to the dummy bit lines. Each column direction load circuit is provided with plural NMOS transistors fixed to an off state, predetermined ones of which have the source and the drain suitably coupled to any of the dummy bit lines. Load capacitance accompanying diffusion layer capacitance of the predetermined NMOS transistors is added to the dummy bit lines, and corresponding to the load capacitance, the delay time from a decode activation signal to a dummy bit line signal is set up. The dummy bit line signal is employed when setting the start-up timing of a sense amplifier. 2. The semiconductor device according to claim 1 ,wherein a gate length of the second MIS transistor is longer than a gate length of the first MIS transistor.3. The semiconductor device according to further comprising:a word line driving circuit including a third MIS transistor and operable to drive the word line,wherein a gate length of the second MIS transistor is longer than a gate length of the third MIS transistor.4. The semiconductor device according to claim 1 ,wherein the first wiring forms at least one both-way wiring and includes a first dummy bit line used as an outward wiring and a second dummy bit line used as a homeward wiring. This application is a Continuation of U.S. application Ser. No. 15/367,829, filed Dec. 2, 2016, which is a Continuation of U.S. application Ser. No. 14/981,195, filed Dec. 28, 2015, now patented as U.S. Pat. No. 9,542,999, which is a Continuation of U.S. application Ser. No. 14/321,169, filed Jul. 1, 2014, now patented as U.S. Pat. No. 9,281,017, which is a Continuation of U.S. application Ser. No. 14/026,575, filed Sep. 13, 2013, now patented as U.S. Pat. No ...
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