| 摘要 |
PURPOSE:To obtain a counter measures by attaining compulsorily a mode for lowering power consumption and detecting surely an abnormal temperature through an initial device examination to be carried out prior to shipping and the like, when a chip detecting temperature has exceeded a specified value. CONSTITUTION:When an IC chip 10 exceeds a specified temperature, an output of a chip temperature detector 2 is reversed to L and an output CS of a NAND gate 11 comes out L through an inverter 12, even though a chip selecting signal anti CS is in the selective state at L. As a result, a constant current source of peripheral circuit 4-6 is cut off and is compulsorily moved to a mode of lowering a power consumption. And with the suppression of chip's heating, an output of semi-conductor storage device is stopped and then a temperature rising is assuredly detected. Thus even the initial device examination to be performed prior to the shipping assures the detection of an abnormal temperature of chips and makes it possible to take the specified measures.
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