Semiconductor integrated circuit having leakage current cut-off circuit

Abstract

In the disclosed semiconductor integrated circuit, a plurality of power supply terminals of the logic circuit block are connected to the actual power supply line via the leak current cut-off circuit. When the logic circuit block is to be activated, the delay control circuit controls the leak current cut-off circuit to electrically connect the power supply terminal to the actual power supply line with a delay of the predetermined time. Therefore, when the logic circuit block is activated, voltage drop of the actual power supply line can be lowered to a small value and erroneous operation of the other logic circuit block in the activated condition due to the power supply noise can be prevented.

Description

[0001] Cross-references to related applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2002-92801 filed on March 28, 2002, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a semiconductor integrated circuit, and more particularly to a semiconductor integrated circuit having a leakage current cut-off circuit capable of reducing current consumption in a standby condition. Background technique [0004] In recent years, for semiconductor integrated circuits mounted in mobile electronic devices, high-speed operation and low power consumption have been required to satisfy demands in high-speed operation and long-time driving. In order to achieve low power consumption, the supply voltage must be reduced. However, when the power supply voltage decreases, the operation speed related to the power supply voltage also decreases. In order to compensate fo...

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Problems solved by technology

Due to this power supply noise, the virtual power supply lines of the logic blocks 124-2~n in the active condition also exhibit a large voltage drop, which triggers malfunctioning of the logic blocks 124-2~n

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