• Uses only one transistor and one capacitor to store one bit of data.
• The ‘1’ or ‘0’ states correspond to the presence or absence of a charge in a capacitor controlled by the transistor switching circuit
• Needs refreshing and requires less space than SRAM.
• Consumes more power
• Slower than SRAM
• Cheaper than SRAM

Dynamic RAM

To write information into the cell, a voltage signal applied to the data line. Voltage signal can either be high or low representing 1 and 0 respectively. A signal is applied to the word line to switch on T. Now the capacitor charges if the data line is 1. When the transistor is off, the capacitor begins to discharge due to capacitor’s own leakage resistance and due to the fact that the transistor continues to conduct a very small amount of current after it is turned off. There fore the memory cell needs to be refreshed.

Types of Memories << Previous
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