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 ?
Keywords in this release: Embedded memories, magnetic random-access memory, MRAM, dynamic RAM, static RAM, flash memory, digital cameras, smart cards, automotive control systems, digital cameras, universal serial bus flash drives, personal digital assistants, MP3 players, read-only memories, Not-And, NAND, clamshell designs
Designed specifically for environments where ROM, RAM and CPU performance are limited, and written in ANSI C for maximum portability, the STNC Portable Graphics Library is both compact and memory efficient, and can execute-in-place from ROM to further reduce dynamic RAM requirements.
The Mercury Extreme G4 processor upgrades feature 256 Kilobytes of 1:1 L2 cache on-chip and 2 Megabytes of high-speed synchronous dynamic RAM (DDR L3) operating at up to 267 Megahertz (MHz).
and application; and adds dynamic RAM compression to reduce peak load
IBM and Infineon have more than 10 years experience with successful joint development of new chip technologies, including traditional Dynamic RAM (DRAM), logic and embedded-DRAM technologies.
CD Speedster - PC produces speed and performance benefits which are the state of the art in its category -- all without any significant usurping of performance elsewhere in the PC operating system through its unique recyclable dynamic RAM technology.
33GHz processor, 256 Kilobytes of 1:1 L2 cache on-chip and 2 Megabytes of high-speed synchronous dynamic RAM (DDR L3) operating at up to 267 Megahertz (MHz).
In addition to Flash memory, DMPD supplies dynamic RAM components and memory modules which are used for main memory in desktop and portable computers, office equipment, and in numerous networking and communications systems.

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