| 摘要 |
A semiconductor integrated circuit which achieves the low power consumption by the low voltage operation is disclosed. According to the semiconductor integrated circuit, the slew of the output waveform is appropriately controlled by controlling the power supply voltage supplied to driving circuit independently of the power supply voltage of the digital processing circuit.The semiconductor integrated circuit includes a digital processing circuit 400, the slew adjustment circuit 200 for adjusting the slew of the transient response in the output waveform of the driving circuit 200 which inputs the output of the digital processing circuit 400, and a mode control circuit 300 for controlling the operation mode of the entire integrated circuit according to the detection result of the slew adjustment unit 200. The power supply voltage of the driving circuit 120 is set low at beginning, and the power supply voltage is boosted in case the transient response of the output waveform of the driving circuit 120 is more gradual than that of the slew of the reference. If transient response of the output waveform of the driving circuit 120 becomes steeper than the slew of the reference, the adjustment completion signal is output, the power supply voltage of the driving circuit is fixed, and the mode is shifted to the normal operation mode.
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