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SRAM has many differences to Dynamic RAM (DRAM). The first of all is that for DRAMs, to keep the data that is stored from being lost, it has to be refreshed, by writing the same data to it over and over again with special circuitry, much like a pen that dispenses disappearing ink onto paper. The second difference is that SRAMs are also used for specific applications within the PC, where their good points outweigh their bad points compared to DRAM.
Like other semiconductor chips, SRAM chips are made by Photolithography. For SRAM, each bit is composed of between four and six transistors, the parts that hold information, which is why SRAM takes up much more space compared to DRAM. To compare with SRAM, DRAM has only one transistor plus a capacitor acting like a miniature rechargeable battery).
Good differences[change | edit source]
- SRAM does not need to be refreshed.
- Changing Static RAM is faster than DRAM.
Bad differences[change | edit source]
- SRAM is more expensive than DRAM.
- SRAMs take up more space and electricity.