dynamic RAM

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dynamic RAM

dynamic RAM

The most common type of computer memory and generally available today in the form of synchronous dynamic RAM chips (see SDRAM). Most all volatile memory is dynamic RAM because it uses only one transistor and one storage capacitor for each bit. It is denser and much less costly than "static RAM," its faster counterpart.

Dynamic RAM Is a Total Loser
Unlike non-volatile firmware chips (flash, ROM, EEPROM, etc.), which hold their contents when the power is turned off, both dynamic RAM (DRAM) and static RAM (SRAM) require constant power.

The capacitors in a dynamic RAM chip are electrical storage tanks that do a poor job of holding a charge. They constantly leak, and the memory chip would lose its content were it not for the refresh circuitry that continuously re-energizes the capacitors approximately 15 times per second.

In 1968, dynamic RAM was patented by IBM, and the first commercial chips came from Intel and Mostek in the early 1970s. See static RAM and memory types.

A Dynamic RAM Cell
DRAM cells are very simple. The combination of voltage on the row and column lines charges a capacitor. The only problem is that the capacitors keep losing their charges, and the bits must be read and re-written to the same state several times each second.

References in periodicals archive ?
A typical price for 9 D-RAM chips with 256 KB, 100 ns would be $12 to $14 from a computer mail order firm.
Unlike D-RAM chips, SIMMs tend to be machine- and CPU-specific, so that information needs to be supplied when ordering.
Insert your D-RAM chips, SIMM boards, or memory boards into the appropriate socket(s).
In an interview in the August 26 issue of Barron's, Hickey singled out an article in the August 5 issue of Electronic Buyers' News detailing current trends in the Asian D-RAM market.
Company C was one of the top ten D-rams manufacturers in the world and had invested in 64-megabytes, D-ram production.
I will examine the competitiveness of individualistic US MNEs in the domain of concept-intensive design of microprocessors and software, the competitiveness of continuously improved Japanese and Korean MNEs in the area of capital-intensive components of D-rams and printer engines, as well as the competitiveness of flexible Taiwanese and Korean MNEs in relation to labor-intensive keyboards and monitor production.