| 摘要 |
PURPOSE:To prevent completely the breakage of a LSI by connecting an earth terminal to another terminal via a Zener diode among plural terminals and avoiding such a case where an abnormal voltage produced by static electricity is applied to the LSI. CONSTITUTION:A LSI consisting of a CPU 5 and a ROM 6 built in an integrated circuit IC card 1 and plural terminals 2 connected to the LSI are exposed. A terminal 15 is connected to the CPU 5 and the ROM 6 as the earth among those terminals 8-15. While other terminals 8-14 are connected to the CPU 5 or the ROM 6. The CPU 5 is connected to the ROM 6 with an address/data bus 7. Then Zener diodes Z1-Z5 are connected among the earth terminal 15, terminals 8-10, 13 and 14 respectively. This avoids such a case where an abnormal voltage produced by static electricity is applied to the LSI. Thus the breakage of the LSI is completely prevented. |
