Eprom erasable programmable read only memory is also the type of rom is read and written optically. The different types of rom used in the industry are. It can be programmed only once and is not erasable. This article is for those that are unfamiliar with eproms and want to get programming similar to the larger to versions. Inside the prom chip there are small fuses which are burnt open during programming. What is the difference between prom eprom and eeprom. Mrom masked rom prom programmable read only memory. The difference between eprom and eeprom lies in the way that the memory programs and erases. Cheaper than eprom or eeprom and so often used in short production runs, or where the contents of the rom may. Eeprom electrically erasable programmable rom rom stands for readonly memory. Microchips technical team shares a high level, industry view of eeprom.
To write associate eprom, its storage cells should stay within the same initial state. Flash memory these devices are covered in section 10. Unlike eprom, no uv light is required to erase memory. All rom memory is quite slow compared to dram and sram. The number of distinct addresses possible with n input variables is 2n.
Figure 99 shows the main feature sizes of 1mbit eprom analyzed by iceos laboratory. For the love of physics walter lewin may 16, 2011 duration. It is a type of memory that does not lose its contents when the power is turned off. At24c02 is an electrically erasable and programmable rom.
Eeprom can be erased and reprogrammed multiple times. These factors, plus the fact that an eprom is encased in a ceramic package with a quartz window, make the eprom average selling price three to five times the price of the mask rom. Eeprom also e2prom stands for electrically erasable programmable read only memory. For this reason, rom is also called nonvolatile memory. However, more modern types such as eprom and flash. Therefore, the data remains even when there is no continuous power flow.