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Memory Chips or Modules

Memory semiconductors are used to store information. Two main types include:

Static Random Access Memory (SRAM) is a type of memory used in various electronic applications including electronic toys, digital equipment and personal computers.

SRAMs store bits in cells reflecting their logic state, ON for logic 1 or OFF for logic 0. When power is received, all SRAM cells are ON. Any data writing to the SRAM may change some of its cells to a logical state 0FF or 0. SRAM will hold data as a static 'image' as indicated by its name, until written over or is lost from powering the system down.

SRAM PC Cards are often powered by batteries which enable data retention. SRAM is the preferred choice of most electronic designers for use as cache memory because it is extremely fast. As SRAM is faster than regular DRAM, this makes it significantly more expensive.

DRAM or Dynamic Random Access Memory is the technology used in the main memory of a computer. It is made up of up very small capacitors which as all capacitors do, slowly lose their charge over time unless refreshed every few milliseconds.

Since their internal circuitry is simple, DRAMs are more commonly used than SRAMs, because they are cheaper and consume less power even though they are much slower. DRAM can hold approximately four times as much data as a SRAM chip of the same complexity.

Semiconductors Topics

ASIC

Microprocessors

Diodes and Transistors

Memory Chips or Modules

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Guide Written by Paul Wilson

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