The word "static" indicates that the memory holding the content for fixed electrical current, unlike dynamic RAM (DRAM) that needs to be "refreshed" ("refreshed") periodically. This is because SRAM is designed using a transistor without a capacitor. The absence of the capacitor has no power to make a leak so that SRAM does not require periodic refresh. SRAM is also designed using the cluster design of the six transistors to store each bit of information. This design makes SRAM is more expensive but also faster than DRAM. Physically chip, SRAM chip manufacturing costs of about thirty times larger and more expensive than DRAM. But SRAM should not be confused with read-only memory and flash memory, because it is a volatile memory and holds the data only when the electricity continues to be given.
Indicates that the location of the random access memory can be accessed, read or written in a fixed time disregard these data address location in memory.
SRAM chip is typically used as cache memory, this is mainly due to the speed. Currently SRAM access time can be obtained with two nano seconds or less able to compensate approximately 500 MHz processor speed or more.
source :http://id.wikipedia.org/wiki/SRAM
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