| 摘要 |
PURPOSE:To attain a 1-3 decoder circuit with a simple constitution by using an input circuit having a different threshold level. CONSTITUTION:The threshold level of an inverter 1 is set higher than the threshold level of an inverter 2. When the input level is an intermediate level 'N' between the level at which both inverters 1, 2 are logic 0 and logic 1, the output of the inverters 1, 2 is respectively logic 1 and logic 0. Logic 1 is outputted from an AND gate 3 only when the input level is a level at which both inverters 1, 2 are logic 0 in the decoder, logic 1 is outputted from an exclusive OR 4 only when the input level is the intermediate level 'N' and logic 1 is outputted from a NOR gate only when the input level is a level at which both inverters 1, 2 are logic 1, then the decoder acts like the 1-3 decoder.
|
