Semiconductor memory device with refresh timer circuit

Details Semiconductor memory device with refresh timer circuit Semiconductor memory device with refresh timer circuit

1994-10-21

1996-01-16

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Data refresh

365211, 365194, 365212, G11C 11403

Patent

active

054854296

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.

REFERENCES:
patent: 5321661 (1994-06-01), Iwakiri et al.
patent: 5375093 (1994-12-01), Hirano

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