STMicroelectronics has introduced 1MHz two-wire serial EEPROMs in 256-Kbit, 512-Kbit and 1-Mbit densities, compatible with I2C Fast-Mode-Plus allowing data rates up to 2.5-times faster than the I2C Fast-mode. Operating at 1MHz, the M24M01-HR is able to complete a 1-Mbit data transaction in 1 second; the 256-Kbit M24256-BHR in a quarter of a second; and the 512-Kbit M24512-HR in half a second. The two-wire serial EEPROM supports multiple access modes, including byte-write mode as well as 64, 128 and 256-byte page-write modes, random and sequential read modes, automatic address incrementing. As well as easing design in, these modes help engineers optimize system performance and power consumption. A write-control input is provided, while three chip-enable pins allow up to eight devices on a single bus. Also aiding design-in for low-voltage or standard-voltage systems, all three densities are available in variants operating from 1.8V to 5.5V or 2.5V to 5.5V.
Samples of the 256-Kbit, 512-Kbit and 1-Mbit devices are available in the SO-8 packages. Samples in TSSOP packaging are available in 256-Kbit and 512-Kbit densities. Unit pricing, in high-volume quantities, is: $1.40 for the 1-Mbit device; $0.80 for 512 Kbit; and $0.55 for 256 Kbit.
