CLOCK INPUT/OUTPUT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a clock input/output device where a duty ratio of an outputted clock is guaranteed to a value close to 50%.

SOLUTION: A clock input/output device is provided with three state inverters Iv1 to Iv3 and an inverter Iv4. ON resistance by a transistor of a power voltage-side (VDD) is made equal to ON resistance by a transistor of a ground voltage-side (0). Threshold voltage with which output is changed against input is set to be VDD/2. Thus, the duty ratio of the clock outputted from the clock input/output device can be guaranteed to 50%.

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