High density serial EEPROM memory

SGS-THOMSON Microelectronics - the world leader in the serial EEPROM market - has introduced a 64kbit electrically erasable and programmable memory (EEPROM) that is ideal for use in set top boxes, satellite receivers, mobile communications terminals and similar applications that require a compact yet dense nonvolatile memory. Known as the ST24E64, the new device provides 8kx8 bits of non-volatile memory in compact 8-pin SO and DIP packages and also features a new clock pulse counting mechanism that improves data integrity.

The ST24E64 uses the extended I2C serial protocol (XI2C) which overcomes the 16k size limit of the popular I2C bus by extending the address range with a second address byte. The ST24E64 is compatible with standard I2C products, allowing both kinds of devices to be used on the same bus. In addition, the bus speed has been increased to 400kb/s and both the input noise suppression and output buffer circuits have been optimised for the higher speed.

The ST24E64 employs a clock pulse counting circuit that improves data security by preventing transient voltages from interfering with write cycles. With this scheme, the write command is only validated if it is presented during a well defined time slot in the cycle, measured in terms of clock cycles. Other major features include low voltage capability (write operations at 2.5V and read operations at 2.0V), standard and industrial temperature ranges (-40°C to +85°C) and a choice of plastic DIP8 and SO8L packages.

Like all SGS-THOMSON EEPROMs, the ST24E64 exhibits exceptional reliability, due to the use of a robust CMOS process and a proprietary cell design, coupled with the manufacturing expertise that is to be expected from a worldwide technology and market leader in the field of programmable non-volatile memories.

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