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Programming
PLD-PROM-EPROM- EEPROM
In-house programming, erasure, device blank verification marking,
and labeling available for quick turnaround.
PROM
Programmable-read-only-memory: A ROM which requires a programming
operation. A memory device whose stored data content is established
on an individual device basis through a programming process (usually
involving the blowing of fuse links on the surface of the die).
Unlike EPROMs and EEPROMs, PROMS cannot be erased and reprogrammed.
EPROM
Erasable Programmable Read Only Memory: A memory device whose
content can be established through a programming process ( usually
hot electrode injection) and can be totally erased by exposure to
ultraviolet light for sustained periods (typlically 30 minutes).
When properly erased, the device can be reprogrammed.
EEPROM (E2PROM)
Electronically Erasable Programmable Read Only Memory: A memory
device whose content can be established through a programming process
(usually the tunneling of electrons across a thin layer of silicon
dioxide to a floating gate). Each memory cell of an EEPROM can be
individually erased by imposing a voltage to reverse the flow of
electrons to move them away from the floating gate. The cell can
then be reprogrammed. Both programming and erasing can be performed
without removal of the device from the system in which it is used.
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