| 摘要 |
PURPOSE:To make the entire circuit small by providing switch elements stepwise operated in response to a signal from a control terminal so as to count the difference between inputted numbers of on-state and inputted number of off-state. CONSTITUTION:Control terminals IY1-IY4 receiving an on-state, control terminals IN1-IN4 receiving an off-state, and control terminals IA1-IA4 receiving an intermediate-state which is neither on-state nor off-state are provided to a 1st-4th stage of the count circuit. Switch elements of (2n-1) sets are provided to the n-th stage and a signal from an input terminal is selectively outputted to its next stage depending on a signal from the control terminal of the stage. For example, 3rd switching elements of the 3rd stage are MOST Q19-Q21. For example, an input signal whose level is logical H is given to the terminals IY1, IA2, IY3, IN4, only MOST 3, Q11, Q24, Q43 are turned on and a low level signal is outputted from an output terminal O(+1) only. |
