EPROM
internal structure
•EPROM means Erasable Programmable Read Only Memory.
•It
allows to store
data and to erased data and add new data means it is erasable and reprogrammable ROM (Read Only Memory).
•It is
useful for changing
or updating memory.
•Ultraviolet
(UV) light is
use for erasing data from EPROM therefore these chips are mounted on package
which have transparent
window.
•It is
exposed to Ultraviolet (UV) light for about 20 minutes and quartz window is use.
•EPROM
is programmed by forcing
small electrical charge on a floating gate.
•EPROM
consists of thousands
of storage cells.
•Programming
phenomenon is called hot
electrons injection.
•Floating
gate is made from polysilicon
material and
it is located in memory cell.
•When
EPROM exposed to UV light it erased all data from chip means selective data erasing is not
possible with
EPROM.
•It is
same like ROM but it consists of special transistor connected through ground.
•Special
transistor is act as switch and it is normally turned off.
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