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static random-access memory
(foldoc) | static random-access memory
SRAM
static RAM
(SRAM) Random-access memory in which each bit of
storage is a bistable flip-flop, commonly consisting of
cross-coupled inverters. It is called "static" because it
will retain a value as long as power is supplied, unlike
dynamic random-access memory (DRAM) which must be regularly
refreshed. It is however, still volatile, i.e. it will lose
its contents when the power is switched off, in contrast to
ROM.
SRAM is usually faster than DRAM but since each bit requires
several transistors (about six) you can get less bits of SRAM
in the same area. It usually costs more per bit than DRAM and
so is used for the most speed-critical parts of a computer
(e.g. cache memory) or other circuit.
(1995-04-22)
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