| 摘要 |
N-channel MOS transistors are connected to bit lines so as to correspond to the data to be read out. A constant current outputting circuit uses an off leakage current of load transistors similar to the N-channel MOS transistors as a reference current to constitute a current mirror circuit having a mirror ratio according to the number of the N-channel MOS transistors connected to each bit line. P-channel MOS transistors of the constant current outputting circuit are connected to the bit lines and supply a current according to the off leakage currents of the N-channel MOS transistors. Thus, malfunctions caused by such as off leakage currents of transistors or the like can be reliably prevented without causing an increase in access time.
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