EEPROM modules

Microchip has announced a series of serial presence detect EEPROM devices that support the latest double data rate 2 (DDR2) DIMM modules used in PCs, as well as future DDR3 DIMM modules.

The 34AA02, 34LC02 and 34VL02 (34XX02) devices meet the latest JEDEC standard for SPD EEPROM devices, with the 34VL02 supporting the lowest operating voltage range of any SPD EEPROM (1.5 to 3.6 V).

All the EEPROMs are available in JEDEC-standard packages and are claimed to be the only SPD EEPROMs available in the 6-pin SOT-23 package.

When combined with the already-announced MCP9805 memory module digital temperature sensor and MCP98242 temperature sensor with SPD EEPROM, the 34XX02 devices mean the company now provides a family of devices for the SPD and temperature needs of DRAM manufacturers.

The next-generation 34XX02 devices are designed to meet the JEDEC standard for newer DDR2 and future DDR3 modules, while also supporting the older DDR1 requirements.

Because of their low operating voltage ranges of 1.7 to 5.5 for the 34AA02; 2.5 to 5.5 for the 34LC02 and 1.5 to 3.6 for the 34VL02, the devices can be designed into current and future PCs that use low-voltage battery designs.