Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM | NEtechy

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Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM

Explain What is Static Random Access Memory Explain What is Static Random Access Memory Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM

Explain What is Static Random Access Memory

Explain Static Random Access Memory

Static random-access memory (static RAM or SRAM) is a type of semiconductor memory that uses bistable latching circuitry (flip-flop) to store each bit. SRAM exhibits data remanence, but it is still volatile in the conventional sense that data is eventually lost when the memory is not powered.

The term static differentiates SRAM from DRAM (dynamic random-access memory) which must be periodically refreshed. SRAM is faster and more expensive than DRAM; it is typically used for CPU cache while DRAM is used for a computer's main memory.

Explain Static Random Access Memory

Static indicates that the memory retains its contents as long as power is being supplied. However, data is lost when the power gets down due to volatile nature. SRAM chips use a matrix of 6-transistors and no capacitors.

Transistors do not require power to prevent leakage, so SRAM need not have to be refreshed on a regular basis.

Applications and uses



  • Low power consumption
  • Simplicity refresh circuit is not needed
  • Reliability


  • Price
  • Capacity

Clock rate and power :

The power consumption of SRAM varies widely depending on how frequently it is accessed; it can be as power-hungry as dynamic RAM when used at high frequencies, and some ICs can consume many watts at full bandwidth. On the other hand,

static RAM used at a somewhat slower pace, such as in applications with moderately clocked microprocessors, draws very little power and can have a nearly negligible power consumption when sitting idle in the region of a few micro-watts. Several techniques have been proposed to manage the power consumption of SRAM-based memory structures.

Static RAM exists primarily as:

General purpose products

with the asynchronous interfaces, such as the ubiquitous 28-pin 8K × 8 and 32K × 8 chips (often but not always named something along the lines of 6264 and 62C256 respectively), as well as similar products up to 16 Mbit per chip

with the synchronous interface, usually used for caches and other applications requiring burst transfers, up to 18 Mbit (256K × 72) per chip

Integrated on-chip:

  • As RAM or cache memory in micro-controllers (usually from around 32 bytes up to 128 kilobytes)
  • as the primary caches in powerful microprocessors, such as the x86 family, and many others (from 8 KB, up to many megabytes)
  • to store the registers and parts of the state-machines used in some microprocessors (see register file)
  • on application specific ICs, or ASICs (usually in the order of kilobytes)
  • in FPGAs and CPLDs

Embedded use :

  • Many categories of industrial and scientific subsystems, automotive electronics, and similar, contain static RAM.
  • Some amount (kilobytes or less) is also embedded in practically all modern appliances, toys, etc. that implement an electronic user interface.
  • Several megabytes may be used in complex products such as digital cameras, cell phones, synthesizers, etc.
  • SRAM in its dual-ported form is sometimes used for real-time digital signal processing circuits.

In computers use :

SRAM is also used in personal computers, workstations, routers and peripheral equipment: CPU register files, internal CPU caches, and external burst mode SRAM caches, hard disk buffers, router buffers, etc. LCD screens and printers also normally employ static RAM to hold the image displayed.

Static RAM was used for the main memory of some early personal computers such as the ZX80, TRS-80 Model 100 and Commodore VIC-20.

Read Also

What is Random Access Memory? Types of Random Access Memory [RAM]
What is a Motherboard in Computer? - Components of the Motherboard
What is Hard disk in Computer? How does it work?

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NEtechy: Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM
Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM
Explain What is Static Random Access Memory Explain What is Static Random Access Memory Explain What is Static Random Access Memory - Advantages and Disadvantages of SRAM
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