| 摘要 |
The invention relates to an integrated circuit memory device 1 in which connecting terminals 11b for transmitting signals between itself and an external device are provided on a bottom surface of a coin-shaped case 10 containing an integrated circuit memory chip 12. A changeover switch 20 for changing the memory chip 12 to a data-writing mode is provided at an outer peripheral side portion of the coin-shaped case 10. The switch 20 has an operation knob 24 located in a notch 13A formed in a ring-shaped core member 13 of the case 10, and a contact plate 22 formed integrally with the knob 24. The switch 20 selectively switches the memory chip 12 in a data-writing mode and in a data-writing protect mode. In the data-writing protect mode, the write (WR) signal supplied to a write terminal of a circuit substrate 11 is prevented from being input to a write electrode of the memory chip 12.
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