Semiconductor memory having self-refresh function

Details Semiconductor memory having self-refresh function Semiconductor memory having self-refresh function

1995-07-25

1998-06-30

Yoo, Do Hyun

Static information storage and retrieval

Read/write circuit

Data refresh

365148, 365149, 36518907, 36518909, 365203, 365236, G11C 700

Patent

active

057744041

ABSTRACT:
A semiconductor memory controls the timing of refreshing memory cells. The semiconductor memory has a capacitor for holding charges, a precharge circuit, and a current source. The precharge circuit has at least a transistor for precharging the capacitor. The current source has a positive temperature coefficient to increase a current as the temperature rises and discharges the capacitor. The timing of refreshing the memory cells is controlled according to a temporal change in the voltage of the capacitor. This arrangement is capable of refreshing the memory cells in a refresh period adjusted to the actual data hold time of the memory cells.

REFERENCES:
patent: 5499214 (1996-03-01), Mori et al.

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