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Its development came out of the standard EPROM technology that was widespread in the late s and s. These EPROM memories could be programmed, typically with machine software, and then later erased by exposing the chip to UV light if the software needed to be changed.
Although the erasure process took an hour or so, this was quite acceptable for development environments. However these semiconductor memories could not be erased electrically, and a totally electrical arrangement would have been more convenient.
The advantage of an EEPROM memory, apart from the eeprmo that the data stored is non-volatile, is that it is possible to read data from it and also erase it and write data to it.
A – A 16K ns Parallel EEPROM
In this way the memory device could run from a single supply, thereby considerably reducing the cost of an overall circuit using an EEPROM and simplifying the design. As a result it is necessary to use the data stored in the EEPROM memory in such a way that this does not impede the operation of the overall system.
Typically the data stored in it can be downloaded at start-up. It is also important to note that Write and erase operations are performed on a byte per byte erprom.
Although there are several different memory cell configurations that can be sued the basic principle that is behind each memory cell is the same.
Often the memory cell will comprise two field effect transistors. One of these is the storage transistor. This has what is termed a floating gate.
EEPROM Technology | Overview Basics Tutorial |
Electrons can be made to become trapped in this gate, and the presence or absence of electrons then equates to the data stored there. The other transistor generally in erprom memory cell is what is known as the access transistor and it is required for the operational aspects of the EEPROM memory cell.
The actual way in which the memory device is operated depends upon the flavour or memory type and hence its electrical interface. There are two ways in eeprkm these memory devices can fail:.
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