Learn all about our serial EEPROM products in only 20 minutes with a webseminar: MPLAB® Starter Kit for Serial Memory Products: Serial EEPROM Overview.

The EPROM+ programming system is designed to support a wide variety of programmable devices from many different manufacturers. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count.

The listed device numbers conform to the core numbers used by most industry standard parts. Since the individual listing of every part number from every manufacturer creates a prohibitively large list, we list all supported manufacturers in a separate table with core part numbers arranged by technology family and pin count where applicable. This approach allows you to more easily locate a device number, as many users do not know the manufacturer of the device in which they have interest.

If you are uncertain about support for a specific part, please don't hesitate to contact us. WHAT IS A CORE PART NUMBER? A core part number is a number which identifies a device regardless of the manufacturer.

The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers. The example below describes how to determine a typical core part number. Remember, a core part number usually represents hundreds of actual part numbers due to different manufacturers, speeds, temperatures, package types and other chip characteristics.

CORE PART NUMBER DETERMINATION EXAMPLE The devices on the top right are 2764 eproms from five different manufacturers. The images on the bottom right are close-up views of the first three eprom packages. The CORE part number for each device is 2764. Each 2764 has the manufacturers full part number printed on the device. The CORE part number is easily identified and has been hi-lited.

CORE part numbers are easily discerned once you exclude any prefix or suffix characters. Most devices, regardless of the technology family, can be identified by their CORE part number.

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PARALLEL NVRAMS AND FRAMS An NVRAM is a standard RAM ( RAM stands for Random Access Memory) which is used for general operation in computers. The NV stands for non-volatile. The RAM would normally lose its contents when power is removed, however the NVRAM is manufactured with a built in battery which keeps power applied to the memory after power has been removed from the product. The FRAM is also a non-volatime memory component however it uses ferro-electric (magnetic) structure to store information. These parts do not have a battery and maintain their information as an array of magnetic charges. 8 PIN SERIAL EEPROMS, NVRAMS AND HI-SPEED SPI FLASH EPROMS (8 PIN) Serial EEPROMs, NVRAMS and SPI FLASH EPROMS, all 8 pin parts, offer non-volatile storage in a physically small package.

This is accomplished by sending the required command, address and data serially (one bit at a time) over single pins instead of the multiple pins of a parallel part. Although not as fast, serial eeproms and nvrams find use in many products due to their small size and low cost. HI-SPEED SPI FLASH EPROMs are high capacity parts based on FLASH memory technology not EEPROM. These parts must be erased before programming.

Their high storage capacity allows use in computer BIOS plus other memory intensive product applications.

Introduction EEPROM, or Electrically Erasable Programmable Read- Only Memory, is a type of device that allows you to store small chunks of data and retrieve it later even if the device has been power cycled. A lot of modern microcontrollers – such as the ATmega328 – contain some built-in EEPROM, but that doesn't mean that you can't add more! Serial EEPROM devices like the allow you to add more memory to any device that can speak I²C. Today we're going to learn how to read and write serial EEPROM devices using Arduino.

EEPROM Basics Before we get into the hookup it's probably a good idea to familiarize ourselves with EEPROM and the history of ROM in general. That said, if you don't nerd-out on computer history it's probably safe to skip that section. Read-Only Memory ( ROM) is a type of computer memory which, generally speaking, is only programmed once (or very occasionally) and then gets read from the rest of the time. This is because it's very slow — or impossible — to write new data to ROM. The trade-off for very slow write times — traditionally — is that it's also non-volatile meaning that the data doesn't go away when power is removed from the device. This makes it ideal for things like firmware which need to be 'remembered' by the computer, but never actually change. The BIOS in your PC is stored on a form of ROM.