Semiconductor memory device with refresh timer circuit
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United States of America Patent
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Jan 16, 1996
Grant Date -
N/A
app pub date -
Oct 21, 1994
filing date -
Oct 22, 1993
priority date (Note) -
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Abstract
A semiconductor memory device has a dynamic memory element constructed of a capacitor and a transistor; and a refresh timer circuit for automatically recharging the dynamic memory element at periodic time intervals corresponding to an electric charge holding time of the dynamic memory element which changes in accordance with an ambient temperature. Since the refresh timer circuit includes a current bias circuit for varying an electric current in accordance with the ambient temperature and an oscillation circuit for oscillating at a frequency corresponding to the electric current of the current bias circuit, the refresh cycle time changes in response to ambient temperature changes, thus reducing the requisite current capacity of the memory device power supply.
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