| 摘要 |
PURPOSE:To improve a dynamic characteristic and to mitigate the length of bus line on a mask layout, by improving the constitution of a bus driving circuit and avoiding the effect of floating of a low level of a bus line completely. CONSTITUTION:A plurality of bus drive circuits B1, B2...Bn are connected on the same bus line, and the circuits B1-Bn are provided with the 1st and the 2nd enhancement MOSFETs Q1, Q2 inputting signals S1-Sn selecting input data for gates. The 3rd enhancement MOSFETQ2 inputting data signals D1-Dn is connected in series with the FETQ1 and one end of the output of the FETQ3 is connected to a power supply VDD. A connecting pont of the FETsQ1, Q3 is made as an output point of the circuits B1-Bn and connected to bus line resistors R1-Rn, a pull-up high resistance load is connected to one part on the bus lines, allowing to improve the dynamic characteristics and to mitigate the limit of the length of bus lines on the mask layout. |
