| 摘要 |
PURPOSE:To constitute a digital switch by a 2-input logic circuit even when the number of input terminals may be too many by allowing a digital switch circuit to decide all outputs or lower-order bits into the activate state when the input of a high-order bit is activated in the digital switch circuit having plural inputs and outputs with weight. CONSTITUTION:The output of a counter or the like at the pre-stage, for example, is inputted to input terminals 1-6 and only the input terminal 3 goes to a high level. Even when the other input terminals remain at a low level, all output terminals 9-12 go to the high level. Further, various logics are formed by changing OR circuits 13-17 into AND, NOR or NAND circuits. Thus, a special logic circuit is constituted by the most simple 2-input elements, and the kinds of components are made much smaller in comparison with a conventional method.
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