| 摘要 |
PURPOSE:To know a relief address easily by constituting the device so that the specific pin status will change only for a defective address on the basis of the internal signal such as a redundancy selecting signal outputted when a defective address set beforehand is coincident with an inputted address in the specific mode. CONSTITUTION:A redundancy selecting signal phir is inputted to one input terminal of an AND gate circuit 16 as well as a redundant word driver 5s. On the other hand, when a special condition deciding circuit 15 connected to a control terminal 14 is impressed by a voltage at a high level, it outputs a detecting signal phic, which is inputted to the other input terminal of the AND gate circuit 16. As a result, when a defective address is accessed, an output of the AND gate circuit 16 becomes a high level, and a MOSFET18 is turned on. Consequently since a leak current runs in a control terminal 18, a relief address (defective address) can be signaled if this current is detected with external device. |
