| 摘要 |
PURPOSE:To simplify the constitution of a multiplexer and at the same time to reduce the power consumption by using in common the output terminals of two CMOS circuits having a three-state output function respectively. CONSTITUTION:An automatic refresh circuit REF consists of an address counter CONT which produces a refresh address signal and a timer circuit and delivers a switch signal phiref of a multiplexer MPX. A three-state output circuit of the MPX consists of p channel MOSFETs Q86 and Q87, n channel MOSFETs Q88 and Q89 and MOSFETs Q90-93. When the signal phiref is set at a low level, the FETs Q87 and Q88 are turned on to transmit the address signal given from a row address buffer R-ADB to a row decoder R-DCR. While the FETs Q91 and Q92 are turned on when the signal phiref is set at a high level to transmit the address signal given from the counter CONT to the decoder R-DCR. |
