| 摘要 |
PURPOSE:To simplify the circuit and to decrease a chip size, by making unnecessary an inverting input signal in a decoding circuit using a field effect transistor. CONSTITUTION:An output of all output lines 17-20 is made to ''0'' by making a clear signal to ''1'' after input signals I1, I2 are determined and then the clear signal CL is returned to ''0''. In this case, for example, the input signals I1, I2 are both at ''0'', ''1'' is outputted to the output line 17 since FETs 9, 10 are turned off. ''0'' output is given to the output lines 18, 19, 20 since FETs 26, 27 and 28, 29 are turned off. That is, the output line 17 is selected. One of the output lines 18, 19, 20 can be selected similarly, when the input signal is in other state than stated above. |
