| 摘要 |
PURPOSE:To suppress the adverse effect due to a transient current in driving an external load by synthesizing drive currents from plural terminal drive circuits having a different time response to same output information. CONSTITUTION:Transistors (Trs) Q13, Q14 and Q17, Q18 form respectively terminal drive circuits and outputs are connected in parallel. When a voltage on a signal line 11 changes from H to L, buffers each comprised of Q11, Q12 and Q15, Q16 output respectively an inverting signal. When the buffer of the Q11, Q12 has a higher inverting threshold value than the buffer of the Q15, Q16, the Q14 is turned on earlier than the Q18 and then the Q18 is turned on. As a result, the synthesized waveform of the drive currents flowing to the Q14, Q18 is a trapezoidal form. Then the peak value of the drive current is decreased, the time change in the current is decreased to suppress the adverse effect of the transient current.
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