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One article knows what EPROM and EEPROM memory are.

September 10, 2020


EPROM is ErasableProgrammableReadOnlyMemory, which means "erasable programmable read-only memory" in Chinese. It is a rewritable memory chip, and its content will not be lost when power is off. In other words, it is non-volatile. It is programmed by EPROM programmer, which can provide higher voltage than normal working voltage to program EPROM. Once programmed, EPROM can only be erased under strong ultraviolet radiation. In order to erase, the ceramic package of EPROM has a small quartz window. This quartz window is usually covered with an opaque adhesive tape. When erasing, remove the adhesive tape and place it under strong ultraviolet light for about 20 minutes. . The main ICs are 27XX series and 27CXX series.


EEPROM is ElectricallyErasableProgrammableReadOnlyMemory, that is, electrically erasable programmable read-only memory.

  EEPROM is an electrically erasable programmable read-only memory, and its content will not be lost when power is off. Under normal circumstances, EEPROM is read-only like EPROM. When writing is required, it can be written or erased by adding a high voltage to the specified pin, and the erasing speed is extremely fast! Generally, EEPROM chips are divided into two types: serial EEPROM and parallel EEPROM. The input/output of data in serial EEPROM is done through 2-wire, 3-wire, 4-wire or SPI bus interface when reading and writing. Data input/output is carried out through the parallel bus. The main IC has 28XX series.

  EEPROM (Electrically Erasable Programmable Read-Only Memory), an electrically erasable programmable read-only memory-a memory chip that does not lose data after power failure. EEPROM can erase existing information on a computer or special equipment and reprogram it. Generally used in plug and play equipment.

   EPROM (Erasable Programmable ROM, erasable programmable ROM) chip can be erased and written repeatedly, which solves the drawback that PROM chip can only be written once. EPROM chips have a very obvious feature. On the ceramic package on the front, there is a glass window through which you can see the integrated circuit inside. The internal chip can be erased by irradiating ultraviolet rays through the hole. The EPROM eraser is needed to complete the chip erasing operation. The data in EPROM should be written with a dedicated programmer, and a certain programming voltage must be added when writing content to the chip (VPP=12-24V, depending on different chip models). The EPROM model starts with 27, such as 27C020 (8*256K) is an EPROM chip with a capacity of 2MBits. After the EPROM chip writes the data, the window must be sealed with an opaque sticker or tape to prevent the data from being damaged by the surrounding ultraviolet rays.