This document describes the features and characteristics of Microchip Technology Inc. 24AA256/24LC256 (24xx256*). It is a 32K x 8 (256K bit) Serial Electrically Erasable PROM, capable of operation across a broad voltage range (1.8V to 5.5V). It has been developed for advanced, low power applications such as personal communications or data acquisition. This device also has a page-write capability of up to 64 bytes of data. This device is capable of both random and sequential reads up to the 256K boundary. Functional address lines allow up to eight devices on the same bus, for up to 2 Mbit address space. This device is available in the standard 8-pin plastic DIP, and 8-pin SOIC (208 mil) packages.
This document describes the 24AA256 and 24LC256 256‑Kbit CMOS serial EEPROMs, including their electrical characteristics, pin functions, and bus protocol. It covers device selection, features, package options, and detailed functional description of the I²C interface.
The datasheet also includes specifications such as voltage ranges, current consumption, write cycle time, endurance, temperature ratings, and ordering information, as well as worldwide sales and service contacts for Microchip Technology Inc.
| Memory size | 256K 2C CMOS Serial EEPROM |
|---|---|
| Operating voltage (24AA256) | 1.8‑5.5 V |
| Operating voltage (24LC256) | 2.5‑5.5 V |
| Maximum write current | 3 mA at 5.5 V |
| Maximum read current | 400 µA at 5.5 V |
| Standby current | 100 nA typical at 5.5 V |
| Maximum write‑cycle time | 5 ms |
| Endurance | 100,000 erase/write cycles |
| Data retention | > 200 years |
| Industrial temperature range | -40 °C to +85 °C |
| Automotive temperature range | -40 °C to +125 °C |
| Package options | 8‑pin PDIP and SOIC (208 mil) |
| Maximum devices on bus | Up to eight devices |
The 24AA256 operates from 1.8 V to 5.5 V.
Up to eight devices can be cascaded on the bus.
The maximum write‑cycle time is 5 ms.
The typical standby current is 100 nA at 5.5 V.