Answer / v.vijayakumar

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.

Answer / shruti patil

Static RAM (SRAM)

1. 4 times more expensive
2. Very low access time
3. Can store ¼ 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

Answer / madhu rai

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.

Answer / mushu

• Static ram is more reliable and expensive than DRAM

Answer / mushu

• 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.

Answer / rohan

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.

Answer / jasdeep kaur

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.

Answer / babita bhatt

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

Answer / suraj

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

Answer / prince

A SRAM is a common type of computer memory that uses
capacitors and transistors storing electrical charges to
represent memory states. These capacitors lose their
electrical charge, so they need to be refreshed every
millisecond, during which time they cannot be read by the
processor.Static RAM storage is based on the logic circuit
known as flip-flop, which retains the information stored in
it as long as there is enough power to run the device. A
static RAM chip can store only about one-fourth as much data
as a dynamic RAM chip of the same complexity, but static RAM
does not require refreshing and is usually much faster than
dynamic RAM. It is also more expensive.

where as DRAM contains millions of tiny memory cells made up
of a transistor and a capacitor, and can contain one bit of
information – a 0 or a 1. In order to store a bit of
information, the computer needs to put a tiny amount of
power into the cell to charge the capacitor, but this energy
leaks out quickly. So to keep information in dynamic RAM,
your computer needs to recharge all the cells in the memory
chip every few milliseconds, or all the data is lost. This
constant refreshing gives dynamic RAM its name.

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