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SRAM (Static RAM) is an improved architecture of regular DRAM. Traditional DRAM is composed of a transistor and a capacitor, both of which require periodic rewriting (refreshing) in order for data to remain valid. SRAM memory requires no refresh at all. It maintains its information as long as it has sufficient power to store it. This is due to the fact that internally, the SRAM component is made up of flip-flop circuitry that doesn't depend on refreshing.
Unfortunately, it is because of this flip-flop circuitry (made up of four-six transistors) that the SRAM is larger in size and cannot compete with the densities found in modern DRAMs. The density issue explains the higher price for SRAMs.
One benefit with SRAMs is their amazing speed. A typical SRAM device is much faster than traditional DRAM memory, so it can be used alongside the processor as cache to temporarily hold data while it performs other duties. This speed allows quicker access in comparison to DRAMs, which must wait several processor clock cycles before providing the needed information.
| DRAM | About SRAM |
| About DRAM | About Flash Memory |
| About EDO/FPM | About Embedded Memory |
| About SDRAM | About Optical Memory |
| About DDR | |
| About Rambus | |
| About FCRAM |
Other articles in this series:
How to repair RAM
Selecting a memory tester
Types of Memory
Memory Sources
How to test memory
Quality of Memory - Remarked versus marked, brand name vs no name
What is the SPD and how to program it
Evolution of memory