Compact electronic apparatus with a refresh unit for a dynamic type memory
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Apr 14, 1988
filing date -
Apr 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compact electronic apparatus employs a dynamic type memory, e.g., a dynamic random access memory (DRAM), a crystal oscillator circuit for generating a high frequency signal, and a resistor/capacitor (RC) circuit for generating a low frequency signal. When the apparatus is operated, the high frequency signal is used for accessing the data stored in the DRAM. When operation of the apparatus is interrupted, the DRAM is refreshed by the low frequency signal thus reducing the entire power consumption of the apparatus, since the power consumption of the RC oscillator circuit is lower than that of the crystal oscillator circuit.
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