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What is the differences between EPROM and PROM and explain both?



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PROM stands for Programmable Read Only Memory

EPROM stands for Erasable Programmable Read Only Memory
The differences between both are as follows.
  PROM is the older technology while both PROM and EPROM are nonvolatile memory devices.
 • PROMs can be programmed only once while EPROMs are reusable and can be programmed multiple times. 
• The process in the programming of PROMS is irreversible; hence the memory is permanent. In EPROMs memory can be erased by exposure to UV light. 
• EPROMs have a fused quartz window in the packaging to allow this. PROMs are enclosed in complete plastic packaging; therefore UV has no effect on PROMs
 • In PROMs data is written/ programmed onto the chip by blowing the fuses at each bit using much higher voltages than the average voltages used in digital circuits. EPROMS also use high voltage, but not enough to alter the semiconductor layer permanently.


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