To provide a semiconductor chip which allows an identification code to be built therein easily and is low-cost and also allows the identification code to be read out easily, and to provide its driving method.
Input/output pads P0-P4 input and output a signal to an internal circuit 11 via input protection circuits 10. Diodes 12 for identification are provided for one or a plurality of the input/output pads, respectively, according to the identification code. In this case, for example, the diodes 12 for identification are provided for the input/output pads P0 and P2, respectively, since the identification code is "1010". The anodes of the diodes 12 for identification are connected to the input/output pads P0 and P2, respectively. A pad P6 for identification is connected in common to the cathodes of the diodes 12 for identification. By applying positive current to the input/output pads P0-P4 while the ground voltage is applied to the pad 6 for identification, the identification code is read out as a voltage value. The diodes 12 for identification could be connected inversely.
| JP4867206 | Semiconductor device |
| JP5183622 | Test equipment, electronic devices and test methods |
| JPH02301165 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE |
Shigeru Iijima
Kobayashi Hideyoshi
Next Patent: MOUNTING APPARATUS FOR ELECTRONIC COMPONENT