EPROMs are Erasable programmable read only memory chips. This device is mainly used as a memory to store a small amount of data. Some micro-controllers use this memory to store its program contents. EPROMs must be erased before they are rewritten. This is usually done by exposing them to UV light through the window provided on the chip. Exposure of the chip to UV light for longer periods of time can over erase the memory cells of EPROM which may not be readily fixable. Modern EPROM chips have a capacity ranging from few KB's to nearly 8 MB of storage space. To erase EPROM's, they must be removed from the circuit. So, this is not practical in many applications these days. Some versions of Intel 8048 microcontrollers used EPROM in their processors. In the modern world, EPROM chips are at the end of their existence as they are being succeeded by newer type of memories which are practically easy to implement like flash memory.
By: Sandeep Mahanthi
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