Static ram are high speed memory. A fast memory technology that requires power to hold its content. Static RAM is used for high-speed registers, caches and relatively small memory banks such as a frame buffer on a display adapter.
You already know that mainly memory in a computer are typically Dynamic RAM. Static RAM chips have access times in the 10 to 30-nanosecond range, while Dynamic RAM is usually above 30 ns (cycle lenght).
Static RAM has also low density. And one of the other advantage of this type of memory is no duty to refresh.
SRAM are fast because each cell is consists of 6 transistors. Althought SRAM take more place then Dynamic Random Access Memory made with one transistor and one capacitor.
But the higher prices and heftiness this type of memory reduced their production.
