| 摘要 |
PURPOSE:To prevent malfunction of a circuit of the next stage from taking place by connecting a clamp element clamping a logical level of an output circuit to an input terminal of an output element, connecting the clamp element to an output terminal of the output element and connecting a reference level wire giving a reference level of the clamp to the clamp element. CONSTITUTION:When other (n-1)-set of output circuits are inverted from a high level to a low level at the same time while a low level is outputted to an output circuit 1, a potential rise of DELTAVgnD(MAX)=(n-1).Ldi/dt is generated to a GND line to which emitters of output transistors (TRs) Q14-Qn4 are connected in common the same as a conventional circuit. The potential rise of the GND line increases a base potential of the output TRQ14 of the output circuit 1 to a potential of nearly same degree and further up to a collector potential, but the operation suppressing automatically the said collector potential rise is conducted by the operation of a clamp TRQA1. Thus, the level of the Vp1 does not surpass the threshold voltage of the circuit of the next stage, thereby preventing malfunction from taking place. |
