| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the layout area of the redundancy fuse circuit by conducting pre-charging in response to a low level transition of a clock signal and keeping a state of a redundancy addressing signal of a preceding clock till a succeeding clock. SOLUTION: When a clock signal CLK transits to a low level, a FET21-1 of a pre-charge circuit 10 is turned on and a FET25-1 of a switch circuit 30 is turned off and a node ND 11 is pre-charged. In this case, FETs 21-3, 25-2 of a transfer circuit 40 are turned off according to the signal CLK and a high level of the node ND11 is not delivered to an output node ND. Even when the signal CLK goes to a low level, the high level logic state in the just preceding state is maintained for a latch circuit 50 latching a state of a node ND 15.</p> |
