Types of RAM

• There are three types of RAM :

DRAM • Dynamic Random Access memory

SRAM • Static Random Access memory

MRAM• Magnetoresistive

Random Access memory

RAM

Dynamic Random Access memory

Dynamic Random Access Memory

Has memory cells with a paired transistor & capacitor.

Each bit data is store in separate capacitor .

Dynamic Random Access Memory

Capacitor may be charged or uncharged.

Charging & discharging represent the two values of data (0,1)

Dynamic Random Access Memory

Types are:

Static Random Access Memory

Static Random Access Memory

Uses multiple transistors for cell.

Doesn't have a capacitor in each cell.

It is made up of flip flop circuit.

It use voltage to store data.

Static Random Access Memory

Each SRAM is made of six transistors.

Each bit in an SRAM is stored on four transistor or more.

Types are:

Static Random Access Memory

Static vs Dynamic

Magneto resistive Random Access memory

Magnetoresistive Random Access memory

Stores data using magnetic charges instead of electrical charges.

Greater storage capacity.

Consumes less power.

Faster access times than electronic RAM.

MRAM retains its contents after power is removed from the computer.

Magnetoresistive Random Access memory

DDR SDRAMDDR3 DDR4

SDRAM – 66Mhz, 100Mhz, 133Mhz DDR1 – 266Mhz, 333Mhz, 400Mhz DDR2 – 400Mhz, 533Mhz, 677Mhz, 800Mhz DDR3 – 400Mhz, 533Mhz, 677Mhz, 800Mhz, 933Mhz, 1066Mhz DDR4 – 1600Mhz, 1866Mhz, 2133Mhz, 2400Mhz, 2666Mhz, 3200Mhz, 4266Mhz

JEDEC Solid State Technology AssociationJoint Electron Device Engineering Council

1.5 or 1.65 v 800 and 2400

16 Gb

1.2 v1600 and 3200

128 Gb

Types of DRAM

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