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Question
Difference between static and dynamic RAM?
 Question Submitted By :: Operating-Systems-General-Concepts
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Static RAM: No refreshing, 6 to 8 MOS transistors are
required to form one memory cell, Information stored as
voltage level in a flip flop.
Dynamic RAM: Refreshed periodically, 3 to 4 transistors are
required to form one memory cell, Information is stored as
a charge in the gate to substrate capacitance.
 
Is This Answer Correct ?    272 Yes 42 No
V.VIJAYAKUMAR
 
Answer
# 2
Static RAM (SRAM)

1. 4 times more expensive
2. Very low access time
3. Can store as much
4. Information stored on RS flip-flops
5. No need for refreshing

Dynamic RAM (DRAM)

1. Low cost
2. Consumes less power
3. Can store 4 times as much
4. Information stored on FET transistors
5. Needs to be refreshed
 
Is This Answer Correct ?    148 Yes 22 No
Shruti Patil
 
 
 
Answer
# 3
Dynamic RAM:-Dram stores the data in the form of charge
into capacitor.for storing another charge capacitor require
to refresh the data which it holds.This refresh operation
is where dynamic RAM gets its name.

Static RAM:-is a type of semiconductor memory where the
word static indicates that, unlike dynamic RAM (DRAM), it
does not need to be periodically refreshed, as SRAM uses
bistable latching circuitry to store each bit.
 
Is This Answer Correct ?    166 Yes 62 No
Madhu Rai
 
Answer
# 4
Static ram is more reliable and expensive than DRAM 
Is This Answer Correct ?    136 Yes 47 No
Mushu
 
Answer
# 5
A static memory cell takes a lot more space on a
chip than a dynamic memory cell.
Static RAM is used to create the CPU's speed-
sensitive cache, while dynamic RAM forms the larger system
RAM space.
 
Is This Answer Correct ?    97 Yes 41 No
Mushu
 
Answer
# 6
Dynamic RAM is the most common type of memory in use today.
Inside a dynamic RAM chip, each memory cell holds one bit
of information and is made up of two parts: a transistor
and a capacitor. These are, of course, extremely small
transistors and capacitors so that millions of them can fit
on a single memory chip. The capacitor holds the bit of
information -- a 0 or a 1 (see How Bits and Bytes Work for
information on bits). The transistor acts as a switch that
lets the control circuitry on the memory chip read the
capacitor or change its state.

Static RAM uses a completely different technology. In
static RAM, a form of flip-flop holds each bit of memory
(see How Boolean Gates Work for detail on flip-flops). A
flip-flop for a memory cell takes 4 or 6 transistors along
with some wiring, but never has to be refreshed. This makes
static RAM significantly faster than dynamic RAM. However,
because it has more parts, a static memory cell takes a lot
more space on a chip than a dynamic memory cell. Therefore
you get less memory per chip, and that makes static RAM a
lot more expensive.

So static RAM is fast and expensive, and dynamic RAM is
less expensive and slower. Therefore static RAM is used to
create the CPU's speed-sensitive cache, while dynamic RAM
forms the larger system RAM space.
 
Is This Answer Correct ?    68 Yes 17 No
Rohan
 
Answer
# 7
STATIC RAM vs DYNAMIC RAM
Firstly we anxious with static RAM
1)it does not loose signal strength.
2)no refreshing.
3)They made of transistors.

Where as Dynamic RAM
1)looses its signal 1 becomes 0
2)periodic refreshing of memory is needed.
3)These are mostly made of capacitors.
 
Is This Answer Correct ?    53 Yes 7 No
Jasdeep Kaur
 
Answer
# 8
Static RAM: 1.No refreshing required
2.6 to 8 MOS transistors are
required to form one memory cell
3.Information stored as
voltage level in a flip flop.
4.used in cache memory
5.high cost
6. Information stored on RS flip-flops
7.small storage capacity
Dynamic RAM:1. Refreshed
periodically
2.3 to 4 transistors are
required to form one memory cell
3.Information is stored as
a charge in the gate to substrate capacitance.
4.used in main memory
5.low cost
6.Information stored on FET transistors
7.comparitively high storage capacity
 
Is This Answer Correct ?    53 Yes 7 No
Babita Bhatt
 
Answer
# 9
Dynamic RAM stores the information in the form of electric
charges. These charge is stored capatictor which, soon get
discharged as the time elapsed. However to restrict this we
use regenerating circuit,which is used to refersh the
charges. It requires less transistors to implement this
hence it is cheaper than static RAM.

Static RAM on the other hand, the information (each bit) is
flipfloped from 0 to 1. In this way there is no need of
refreashing. It requires more no. of transistor to implement
this.
Such RAM requires shorter read/wite cycles hence fastest.

IMPLEMENTATION OF CACHE MEMORY -----STATIC RAM IS USED
IMPLEMENTATION OF MAIN MEMORY -----DYNAMIC RAM IS USED
 
Is This Answer Correct ?    31 Yes 7 No
Suraj
 
Answer
# 10
static ram:it consist of internal flip-flops that store
binary information.The stored information remains as long as
the power is applied to the unit.It is easy to used & has
shorter read and write cycles.
dynamic ram:it stores the binary information in the form of
electric charge applied to capacitor.The capacitor is
present inside the MOS tansistors.The storage charge on the
capacitor tends to be discharged with time & the capacitor
must periodically charged by refreshing dynamic memory.
 
Is This Answer Correct ?    4 Yes 1 No
Monika Parmar
 

 
 
 
Other Operating Systems General Concepts Interview Questions
 
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What is busy waiting?   3
What is software life cycle?   2
What is cache memory?   1
What are the sub-components of I/O manager in Windows NT?   1
What is scheduling and How it effects the processor efficiency? HP 1
Differentiate between ROM and RAM? Sutherland 6
Difference between static and dynamic RAM?   22
Which is the best page replacement algorithm and Why ? Intel 2
What is NV-RAM?   3
What is mutant?   2
Differentiate between RAM and ROM? DELL 8
What is the difference between microprocessor and microcontroller? Alcatel 62
 
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