| 摘要 |
<p>PURPOSE:To reduce a steady power consumption by allowing an activation circuit equipped with a fuse not to supply a current to a ROM storing the address of a defective cell when an auxiliary cell is not used. CONSTITUTION:Unless a cell is a memory cell array is not replaced with the auxiliary cell, and has no defect to disconnect all fuses F0-F9 in an address storing ROM1 for a defective cell, the fuse F of the activation circuit 2 remains disconnected. In that state, the node N1 of the circuit 2 becomes H, and transistors Q12 and Q11 are turned on and off, respectively, bring a node N2 to L. Thus a transistor Q13 is turned off, and no current is supplied to the ROM1 through the transistor Q13, whereby a steady power consumption can be reduced.</p> |
