RAM, or Random Access Memory, is a type of data storage used in computers that is located on the motherboard and allows quick access by the processor. There are two main types of RAM: DRAM (Dynamic Random Access Memory) and SRAM (Static Random Access Memory). DRAM needs to be refreshed often and uses a single transistor and capacitor per bit, while SRAM does not need to be refreshed and uses an array of six transistors per bit, making it faster to access but more expensive than DRAM.

1. R A MR a n d o m A c c e s s M e m o r y

2. RAM
RAM (Random access memory) is the place in a computer where
the operating system, application programs, and data in current
use are kept so that they can be quickly reached by the computer's
processor.

3. RAM
• Random Access Memory (RAM) is a type of data storage used in
computers that is generally located on the motherboard.
• This type of memory is VOLATILE because all information that
was stored in RAM is lost when the computer is turned off.

4. Types of RAM
There are two main types of RAM:
• DRAM (Dynamic Random Access Memory)
• SRAM (Static Random Access Memory).

5. DRAM
 Dynamic Random Access Memory (DRAM) is a type of random-access memory used in
computing devices.
 DRAM stores each bit of data in a separate passive electronic component that is
inside an integrated circuit board.
 DRAM needs to be refreshed often otherwise information fades.
 DRAM has one capacitor and one transistor per bit as opposed to SRAM that
requires 6 transistors.
 The capacitors and transistors that are used are exceptionally small.

6. SRAM
• Static Random Access Memory (SRAM) is a type of RAM that holds data in a static form,
that is, as long as the memory has power.
• It does not need to be refreshed.
• SRAM stores a bit of data on four transistors using two cross-coupled inverters.
• During read and write operations another two access transistors are used to
manage the availability to a memory cell.
• To store one memory bit it requires six metal-oxide-semiconductor field-effect
transistors (MOFSET).
• MOFSET is one of the two types of SRAM chips; the other is the bipolar junction
transistor.

7. Why SRAM is faster than DRAM?
• In terms of speed, SRAM is faster. DRAM needs to be refreshed thousands of times per
second while SRAM does not need to be refreshed, which is what makes it faster than
DRAM.
• DRAM supports access times of about 60 nanoseconds, SRAM can give access times as low
as 10 nanoseconds.
• Despite SRAM being faster, it's not as commonly used as DRAM because it's more
expensive.

8. SRAM DRAM
Stores data till the power is supplied. Stores data only for few milliseconds even
when power is supplied.
Uses an arry of 6 transistors for each memory
cell.
Uses a single transistor and capacitor for each
memory cell.
Doesn’t refreshes the memory cell. Needs to refresh.
Data access is faster. Data access is slower.
Consume more power. Consume less power.
Low density/less memory per chip. High density/more memory per chip.
Cost per bit is high. Cost per bit is low.
Differences between SRAM & DRAM

9. END