| 摘要 |
PURPOSE:To decrease the peak current by connecting plural MOS transistors(TRs) between an output terminal and a power terminal and making part of the plural MOS TRs conductive when a power voltage VDD and a potential of an output terminal showing a peak in a ground GND current as a buffer starts moving. CONSTITUTION:P-channel MOS TRs QP1, QP2 are connected between the output terminal OUT and the VDD, and N-channel MOS TRs QN1, QN2 are connected between the output terminal OUT and the GND. The peak current of the VDD and GND at an output buffer is large when the potential at the output terminal starts changing from a low to a high level or from a high to a low level and the current flows to the two MOS TRs QP1, QN1. Thus, the peak of the VDD and GND current at the operation of the output buffer is decreased by reducing the size of them.
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