Memory cell . Memory units are modules made up of a set of locks or capacitors grouped in such a way that they store several n-bit binary words. Each of them have the capacity to store a bit of information (1 or 0), and are known as memory cells . Memory cells or bits are located by the row and column in which it is located.
Summary
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- 1 Description
- 1 For static RAM
- 2 For dynamic RAM
- 2 Sources
Description
A bit of memory. In dynamic RAM, a cell is made up of a transistor and a capacitor . In static RAM , a cell is made up of about five transistors.
For static RAM
Structure of a SRAM memory cell
Basic arrangement of a SRAM
This type of memory known as SRAM (Static Random Access Memory) is made up of cells made up of flip-flops generally built with MOSFET transistors, although there are also some small memories built with bipolar transistors.
the cell is activated by an active level at the top input, and data is loaded or read through the sidelines.
Memory cells are grouped into rows and columns to form the basic memory arrangement. The arrangement of memory cells in a SRAM, each row is enabled simultaneously to receive or load the data from the input / output bus.
For dynamic RAM
Internal composition of one of these cells
This type of memory known as DRAM (Dinamic Random Access Memory), unlike static memory consists of memory cells built with capacitors.
Memory cells are simpler to manufacture compared to transistor-based cells, making it possible to build high-capacity memories.
The operation of the cell is similar to that of a switch, when the status in the row is high, the transistor enters saturation and the data present in the internal memory bus (column) is stored in the capacitor, during a write operation and it is extracted in a read operation. The drawback of this type of memory is that the information stored in the cells must be recharged, so these cells require additional circuitry to fulfill this function.
