| 摘要 |
<p>PURPOSE:To speed up an operation time from the input of an address signal at the time of rising a word line selection signal (WL signal) to a sense amplifier output by providing a pull-down transistor between a data bus or a bit line and a low potential side power source. CONSTITUTION:A pull-down transistor N6 for connecting the data bus to a low potential side power source 2 is provided. Since a current always flows through a P channel transistor P1 by this pull-down transistor N6, at the time of rising the WL signal, the amount of the current flowing through the P1 is the sum of the amount of the current flowing through a memory cell N4 and the amount of the current flowing through the pull-down transistor N6. Therefore, the current flowing through the P1 increases by only the current flowing through a registor, and a current difference between the current flowing through the P1 and the half current (I REF) becomes larger, so the operation time of the sense amplifier becomes faster accordingly. Thus, an access time can be shortened.</p> |
