EPROM ==>
Erasable Programmable Read-Only Memory
<storage> (EPROM) A type of storage device in which the data is
determined by electrical charge stored in an isolated ("floating") MOS
transistor gate. The isolation is good enough to retain the charge almost
indefinitely (more than ten years) without an external power supply. The EPROM
is programmed by "injecting" charge into the floating gate, using a technique
based on the tunnel effect. This requires higher voltage than in normal
operation (usually 12V - 25V). The floating gate can be discharged by applying
ultraviolet light to the chip's surface through a quartz window in the package,
erasing the memory contents and allowing the chip to be reprogrammed.
(1995-04-22)
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