| 摘要 |
PURPOSE:To miniaturize the size, to speed up and to attain the low power consumption of transistors, etc., for pull-down, by turning on a transistor for pull-up only for a prescribed period due to a reverse phase clock and turning it off completely when the transistor for the pull-down is turned on. CONSTITUTION:During the half period from a rise t1 of a clock CK up to a rise t1 of the inverse of CK of a reverse phase clock, the output of a first memory means 12 is received and output b1-b8 of a position detecting circuit 13 are determined. By the inverse of CK of reverse phase clock, transistors T1-T8 for pull-up are turned on and a transistor T16 for pull-down is turned off. Next, simultaneously when the inverse of CK of reverse phase clock rises at t2 and T16 is turned on, the T1-T8 are completely turned off, the code conversion is executed and the converting code is outputted. Consequently, the transistor for the pull-down may be the one sufficient to discharge a precharged charge, the size of the transistor can be also miniaturized and the low power consumption can be attained at a high speed.
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