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ROHM reveals high density, high speed EEPROM

23 Oct 2012

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ROHM Semiconductor has announced its high density and high speed EEPROM series. The line-up of the new member of BR24 family with I2C Bus is adding the high densities 512Kb and 1Mb. It will also offer alternatives for the existing parts from 1-256Kb, but with the possibility to increase the speed to up to 1Mhz, added the company.

The EEPROMs feature a double cell structure to eliminate accidental failures, and a double protection circuit to prevent writing errors. This makes them ideal memory solutions for a range of devices such as consumer, industrial and automotive applications.

Rewriting is performed by passing electrons through a tunnel oxide film. This, however, causes deterioration of the film, eventually leading to memory failure where the memory cell data is locked at '1' and cannot be rewritten to. ROHM's double cell structure prevents this by allotting two cells for each memory bit, connected in an OR configuration so that the second cell is able to operate upon failure of the first.

All LSIs become unstable during power ON and OFF: EEPROMs are even more susceptible to failure, making it impossible to even recover from one malfunction. In response to this, ROHM integrated a double protection circuit consisting of a Power ON Reset (POR) block that resets during start-up and a Low Voltage Write Error Protection Circuit (LVCC) that prevents write operations and resets during low voltage conditions (LVCC and below).

Data can be rewritten up to 1,000,000 times and stored for 40 years. Providing a wide range of memory capacities, from 32Kb up to 1Mb, the devices can be delivered in standard packages such as SO8 and TSSOP8. All control functions are available through two ports of the serial clock (SCL) and serial data (SDA). Facilitating the design, microcontroller port can be saved by connecting other devices but EEPROMs to the same port and an integrated filter is built in the SCL/SDA terminal in order to eliminate noise.

Densities from 32-256Kb are in mass production. 1Mb parts are available as samples from now on, 512Kb parts from middle of October onwards.

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