Memory circuit

Abstract

Abstract PURPOSE:To automatically break electric powr which is not required for holding a data, by only dropping the power source voltage, by constituting so that an absolute value of threshold voltage of a P channel or N channel transistor is made large than the minimum supply voltage value that is capable of holding a data. CONSTITUTION:When threshold voltage of a P channel transistor Q21, threshold voltage of other P channel transistor and N channel transistor, and the minimum supply voltage value that is capable of holding a data are denoted as V'TP, VTP, TTN, and VDR, respectively, VDR>¦VTP¦, ¦VTN¦ holds good. Also, ¦V'TP¦ is set so as to be larger than VDR. Accordingly, in case of VDR<Vcc, a data can be held, but especially, in case of VDR<Vcc<¦V'T)¦, the P channel transistor Q21 is off, irrespective of input voltage, and a power source current of an input circuit can be broken.

Inventors

• 👤 Yasuo Kobayashi
• 👤 康夫 小林
• 👤 Kazuo Nakaizumi
• 👤 中泉　一雄

Bibliographic Details