Sram and dram memory pdf

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sram and dram memory pdf

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Static random-access memory

Reading and writing in RAM is easy and rapid and accomplished through electrical signals. Simple and uses capacitors and very few transistors.

Single block of memory requires 6 transistors Only one transistor. Charge leakage property Not present Present hence require power refresh circuitry Power consumption Low High. Its construction is comprised of two cross-coupled inverters to store data binary similar to flip-flops and extra two transistors for access control.

It consumes less power. SRAM can hold the data as long as power is supplied to it. To generate stable logic state, four transistors T1, T2, T3, T4 are organized in a cross-connected way. Both states are stable until the direct current dc voltage is applied. The SRAM address line is operated for opening and closing the switch and to control the T5 and T6 transistors permitting to read and write.

For read operation the signal is applied to these address line then T5 and T6 gets on, and the bit value is read from line B. The capacitor is used for storing the data where bit value 1 signifies that the capacitor is charged and a bit value 0 means that capacitor is discharged. Capacitor tends to discharge, which result in leaking of charges. The dynamic term indicates that the charges are continuously leaking even in the presence of continuous supplied power that is the reason it consumes more power.

To retain data for a long time, it needs to be repeatedly refreshed which requires additional refresh circuitry. Due to leaking charge DRAM loses data even if power is switched on. DRAM is available in the higher amount of capacity and is less expensive.

It requires only a single transistor for the single block of memory. At the time of reading and writing the bit value from the cell, the address line is activated.

The transistor present in the circuitry behaves as a switch that is closed allowing current to flow if a voltage is applied to the address line and open no current flows if no voltage is applied to the address line. For the write operation, a voltage signal is employed to the bit line where high voltage shows 1, and low voltage indicates 0.

A signal is then used to the address line which enables transferring of the charge to the capacitor. When the address line is chosen for executing read operation, the transistor turns on and the charge stored on the capacitor is supplied out onto a bit line and to a sense amplifier. The sense amplifier specifies whether the cell contains a logic 1 or logic 2 by comparing the capacitor voltage to a reference value. The reading of the cell results in discharging of the capacitor, which must be restored to complete the operation.

Even though a DRAM is basically an analog device and used to store the single bit i. Your email address will not be published. The cache memory is an application of SRAM. In contrast, DRAM is used in main memory. DRAM is highly dense. As against, SRAM is rarer. The construction of SRAM is complex due to the usage of a large number of transistors. On the contrary, DRAM is simple to design and implement.

DRAM is named as dynamic, because it uses capacitor which produces leakage current due to the dielectric used inside the capacitor to separate the conductive plates is not a perfect insulator hence require power refresh circuitry.

On the other hand, there is no issue of charge leakage in the SRAM. Comments information provided on computer organisation… Very useful…. I liked this information. All information provided is organized in an easy way. Leave a Reply Cancel reply Your email address will not be published.

Difference Between SRAM and DRAM

Reading and writing in RAM is easy and rapid and accomplished through electrical signals. Simple and uses capacitors and very few transistors. Single block of memory requires 6 transistors Only one transistor. Charge leakage property Not present Present hence require power refresh circuitry Power consumption Low High. Its construction is comprised of two cross-coupled inverters to store data binary similar to flip-flops and extra two transistors for access control. It consumes less power. SRAM can hold the data as long as power is supplied to it.

Asked by Wiki User. These differences occur due the difference in the technique which is used to hold data. This marks the difference between their performance. They both are different from each other in many contexts like speed, capacity, etc. SRAM is an on-chip memory. The answer is actually fairly simple.

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Abhishek Kandel.

difference between sram and dram pdf

SRAM is volatile memory ; data is lost when power is removed. In , [4] Arnold Farber and Eugene Schlig, working for IBM, created a hard-wired memory cell , using a transistor gate and tunnel diode latch. They replaced the latch with two transistors and two resistors , a configuration that became known as the Farber-Schlig cell. In , Benjamin Agusta and his team at IBM created a bit silicon memory chip based on the Farber-Schlig cell, with 80 transistors, 64 resistors, and 4 diodes. Though it can be characterized as volatile memory SRAM exhibits data remanence.

The information stored in this type of memory is lost when the power supply to the PC or laptop is switched off. It is generally known as the main memory or temporary memory or cache memory or volatile memory of the computer system. In this tutorial, you will learn: What is RAM? What is SRAM?

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