Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

1991-11-06

1993-12-21

LaRoche, Eugene R.

Static information storage and retrieval

Read/write circuit

Data refresh

36518907, 365227, G11C 700

Patent

active

052726762

ABSTRACT:
The self-refresh operation of one round of a RAM using dynamic memory cells is accomplished on the basis of the periodic pulses which are formed by an oscillating circuit substantially having no temperature dependency, and the self-refresh period is controlled by a timer circuit using a time constant circuit corresponding to the temperature dependency of the data storage in the memory cells. The operating voltage or boosted output voltage is monitored to switch the circuit operation for generating a plurality kinds of boosted voltages rising sequentially two and three times so that the boosted voltage may be a desired voltage. A control voltage to be fed to the gate of a MOSFET connected between the substrate and the earth potential of the circuit is generated by a dummy substrate voltage generator having a leakage current path varying to follow the fluctuations in a supply voltage.

REFERENCES:
patent: 4500974 (1985-02-01), Nagami
patent: 4711406 (1988-09-01), Oishi et al.

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