Patent ID: 8867262

Claim:
A semiconductor integrated circuit device comprising: a plurality of static type memory cells each including a first inverter and a second inverter, with an input of the first inverter being coupled to an output of the second inverter and an input of the second inverter being coupled to an output of the first inverter, the first inverter including a first drive transistor having a gate electrode coupled to the input of the first inverter and a drain electrode coupled to the output of the first inverter, and the second inverter including a second drive transistor having a gate electrode coupled to the input of the second inverter and a drain electrode coupled to the output of the second inverter; a source line coupled to provide source electrodes of the first drive transistor and second drive transistor of the plurality of static type memory cells with a source voltage; and a control circuit coupled between the source line and a ground line, controlling to raise the source voltage in response to a level shift of a control signal from a first voltage level to a second voltage level, the control circuit comprising: a first N-channel type transistor configured as a switch, a second N-channel type transistor configured as a diode, and a resistance element coupled between the source line and the ground line and having a resistance value independent of the control signal, wherein the first N-channel type transistor receives the control signal at a gate electrode thereof, the second N-channel type transistor is coupled between the source line and the ground line, the first N-channel type transistor, the second N-channel type transistor and the resistance element are arranged in parallel, and a size of the first N-channel type transistor is larger than a size of the second N-channel type transistor, the semiconductor integrated circuit device further comprises: a plurality of word lines; a plurality of word drivers respectively coupled to drive the plurality of word lines and having respective ground potential nodes coupled to the ground potential without the source line; and a P-channel type transistor having a drain electrode coupled to respective operational potential nodes of the plurality of word drivers, a source electrode coupled to a power supply potential line and a gate electrode receiving a signal for setting the P-channel type transistor on when the control signal has the first voltage level and setting the P-channel type transistor off when the control signal has the second voltage level, wherein the plurality of static type memory cells are arranged in a matrix, and the plurality of word lines are provided for a plurality of rows of the matrix, each word line being coupled to the static type memory cells arranged in the corresponding row.