| 摘要 |
PURPOSE:To decrease the number of transistors(TRs) and to improve the area efficiency by constituting the inverter with 3 N-channel TRs and one p-channel TR in total four TRs. CONSTITUTION:With a High level inputted to an input terminal C, N-channel Trs N1, N3 are turned on, and with a High level inputted to an input terminal D at this time, then an N-channel Tr N2 is turned on and a P-channel Tr P1 is turned off, then a Low level is outputted to an output terminal O. Moreover, with a Low level inputted to the input terminal D, the N-channel TR N2 is turned off and the P-channel Tr P1 is turned on, then a High level is outputted to the output terminal O. With a Low level given to the input terminal C, then the N-channel Trs N1, N3 are turned off and the output terminal O is kept at a High impedance state independent of the state of the input terminal D at this time. Thus, the number of TRs is decreased. |
