| 摘要 |
PURPOSE:To reduce the number of input terminals and input delivery lines, by forming three states corresponding to the binary output to two output terminals, to the three types of input states at the input terminal, through the provision of one input terminal and two output terminals. CONSTITUTION:The voltage dividing circuit 1 is constituted by connecting the resistors R1, R2 and R3 in series connection, and the element side of the resistors R3 and R1 is respectively connected to ground and the power supply VDD, and the junctions A and B of the resistors R1 and R2 and R2 and R3 are given with input. Further, the inverter circuits 2 and 3 of which threshold values are VT1 and VT2. Then, when the input states to the input terminal A are taken as three states of the application of the ground voltage V1, open and ground, the equations (1) and (2) are obtained. Where VT is the representing value of VT1 and VT2, and both VT1 and VT2 satisfy the equations. Thus, the number of input terminals and input delivery lines can be reduced by forming three states according to the binary output to two output voltage terminals corresponding to three types of input voltage stages at the input terminal. |
