| 摘要 |
PURPOSE:To prevent generation of a malfunction by setting a state for sending out an output signal from a logical circuit as it is, and a state for fixing an output level to a prescribed level, by a control signal, so that all output buffers do not generate the same level variation at the same time. CONSTITUTION:Output buffers B11-Bmn using an OR gate are provided so as to correspond to each output signal S1-Sn of a logical circuit LG. They are divided into plural groups of B11-B1n, B21-B2n...Bm1-Bmn, the signals S1- Sn are applied to one input, respectively, and each group is connected in common to the other input, and also connected through buffers B1-Bm to control terminals C1-Cm provided on each group. Accordingly, the buffers B11-Bmn become on when a control signal applied to the terminals C1-Cm is ''L'', and become off when said signal is ''H''. Also, in case of an on-state, the signals S1-Sn are sent out as they are, and in case of an off-state, the output level is fixed to ''H'', and the power source current is not varied. |
