The AT27C020-90JU is a 2-megabit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) from Microchip. It has a JEDEC-compliant package and provides fast and reliable nonvolatile memory for applications requiring large memory densities. The device is organized as 2 Mbit or 256K x 8 bits, making it ideal for storing large amounts of data. The device features a bottom-side control pin that can be used to prevent corruption of data during power up/down. It operates over a wide voltage range of 2.7 - 5.5 volts, and features a fast program time of 10 ms per byte or 20 ms per page, making it great for a variety of applications. It also features self-timed write cycle with automatic erase and the ability to use higher voltage for the self-timed write cycle.