| 摘要 |
PURPOSE:To decrease a consumption current and to improve the power source margin of a sense amplifier by impressing a potential, which is lower than a power source potential, to the gate of a transistor for column selection and precharging a node, for which the sense amplifier is connected, to the power source potential. CONSTITUTION:An intermediate potential generating circuit 8 generates a constant potential VDD which is lower than a power source voltage VCC and higher than a ground potential VSS and supplies it to a column decoder 9. The decoder 9 selectively supplies the potential VDD to the gate of a transistor 2 for column selection based on a column address. A sense amplifier 10 to be composed of NOR gate circuits 11 and 12 is connected to a node A. When a reading signal is 'H', a transistor 1 for precharge is turned on and the node A is precharged up to the potential VCC. Thus, since the circuit 8 only drives the gate of the transistor 2, the consumption current is decreased and the power source margin of the sense amplifier 10 is improved. |
