| 摘要 |
<p>A semiconductor device (1) has a plurality of circuit blocks (BLK1 BLK8) having different operating power source voltages and a common logic threshold voltage in a semiconductor chip (1A). Each circuit block operates with an operating power source voltage which is equal to the potential difference between a low potential level and a high potential level, outputs a signal the amplitude center of which is the logic threshold voltage and corresponds to its operating power source voltage, and receives a signal the amplitude center of which is the logic threshold voltage different from that of the output signal. Even if the operating power source voltage of each built-in circuit block is determined as desired depending on its operating frequency, or each built-in circuit block is programmably switched depending on the operating mode, each circuit block can interface a signal the amplitude center of which is a logic threshold voltage common to the other circuit blocks and corresponds to the operating power source voltage, and therefore any additional circuit such as a level converting circuit is not necessary.</p> |
