A cross section of legacy EPROM structure. Upper insulator: ONO Lower insulator: tunnel oxideSTMicro M24C02 I²C serial type EEPROMAtmel AT93C46A dieAT90USB162 MCU integrates 512 Byte EEPROM
EEPROM or E2PROM (electrically erasable programmable read-only memory) is a type of non-volatile memory. It is used in computers, usually integrated in microcontrollers such as smart cards and remote keyless systems, or as a separate chip device, to store relatively small amounts of data by allowing individual bytes to be erased and reprogrammed.
EEPROMs are organized as arrays of floating-gate transistors. EEPROMs can be programmed and erased in-circuit, by applying special programming signals. Originally, EEPROMs were limited to single-byte operations, which made them slower, but modern EEPROMs allow multi-byte page operations. An EEPROM has a limited life for erasing and reprogramming, reaching a million operations in modern EEPROMs. In an EEPROM that is frequently reprogrammed, the life of the EEPROM is an important design consideration.
Flash memory is a type of EEPROM designed for high speed and high density, at the expense of large erase blocks (typically 512 bytes or larger) and limited number of write cycles (often 10,000). There is no clear boundary dividing the two, but the term "EEPROM" is generally used to describe non-volatile memory with small erase blocks (as small as one byte) and a long lifetime (typically 1,000,000 cycles). Many past microcontrollers included both (flash memory for the firmware and a small EEPROM for parameters), though the trend with modern microcontrollers is to emulate EEPROM using flash.
As of 2020, flash memory costs much less than byte-programmable EEPROM and is the dominant memory type wherever a system requires a significant amount of non-volatile solid-state storage. EEPROMs, however, are still used on applications that only require small amounts of storage, like in serial presence detect.[1][2]
^"TN-04-42: Memory Module Serial Presence-Detect" (PDF). Micron Technology. 2002.
^"serial presence detect (SPD)". TechTarget. July 2015.
EEPROM or E2PROM (electrically erasable programmable read-only memory) is a type of non-volatile memory. It is used in computers, usually integrated in...
for program storage, as opposed to one-time programmable ROM, EPROM, or EEPROM used by other microcontrollers at the time. AVR microcontrollers find many...
prototyping, and in-system programming. (EEPROM technology had been available prior to this time, but the earlier EEPROM was more expensive and less durable...
of floating-gate memory, was invented in Toshiba in 1980 and is based on EEPROM technology. Toshiba began marketing flash memory in 1987. EPROMs had to...
memory – either read-only memory (ROM) or programmable memory such as EPROM, EEPROM, or flash. Changing a device's firmware stored in ROM requires physically...
first PIC microcontroller to feature a serial programming algorithm and EEPROM memory. [citation needed] It is a member of the PIC family of controllers...
Greek-American computer scientist and engineer, best known for pioneering the use of EEPROM and founding Atmel. Perlegos was born in 1950 to parents Eleni and Pete...
EEPROM capacities in similar packages range from 1 kB to 8 MB . Flash chips are tuned for page access, rather than the byte access used with EEPROM....
storage, but with its spinoff it was soon upgraded to use EPROM and then EEPROM, which made it possible for end-users to program the devices in their own...
standards require that certain parameters be in the lower 128 bytes of an EEPROM located on the memory module. These bytes contain timing parameters, manufacturer...
parts in-circuit. Electrically Erasable Programmable Read-Only Memory (EEPROM) was developed to provide an electrical erase function and has now mostly...
and timing for the memory controller to be configured correctly. The SPD EEPROM connects to the System Management Bus and may also contain thermal sensors...
several division headquarters including smartcards, microcontrollers, and EEPROM as well as several R&D centers. Rousset also hosts an 8-inch (200-mm) fab...
the functionality of basic SRAM by adding non-volatile storage such as an EEPROM to the SRAM chip. In operation, data is written to and read from the SRAM...
Examples of non-volatile memory are flash memory and ROM, PROM, EPROM and EEPROM memory. Examples of volatile memory are dynamic random-access memory (DRAM)...
Its products include microcontrollers (PIC, dsPIC, AVR and SAM), Serial EEPROM devices, Serial SRAM devices, embedded security devices, radio frequency...
mA Flash memory: 32 KB, of which 2 KB is used by bootloader SRAM: 2 KB EEPROM: 1 KB Clock speed: 16 MHz Length: 45 mm Width: 18 mm Mass: 7 g USB: Mini-USB...
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