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Flash, SRAM meld in multichip packages

Posted: 16 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:flash memory? sram? combination memory? combomemory? sst32hf202?

Integrated Silicon Solution Inc. and Silicon Storage Technology Inc. have each tucked Flash with SRAM into multichip packages (MCPs). Applications for such devices include pagers, PDAs, 2.5G/3G cellular phones, wireless modems, games, digital video camcorders, MP3 players and GPS devices.

"MCP modules are more space-efficient for mobile applications requiring high performance and low power consumption," said Sanjiv Asthana, vice president of marketing at Integrated Silicon Solution. ISSI combines low-power, asynchronous SRAM with 16Mb, 32Mb and 64Mb NOR Flash memory in top and bottom Flash-sector configurations, in a FBGA.

Available densities are 16Mb Flash with 4Mb SRAM; 32Mb Flash with 4Mb or 8Mb SRAM; and 64Mb Flash with 8Mb SRAM.

The memory devices operate over a 2.7V to 3.3V range. To prolong battery life, standby power is 55A for the SRAM and 0.25A for the Flash. In quantities of 10,000, prices range from $9 for the 16Mb Flash/4Mb SRAM to $20 for the 64Mb Flash with 8Mb SRAM.

Concentrating on low-density, small-form-factor requirements, the ComboMemory family from Silicon Storage Technology includes the SST32HF202 (2Mb Flash plus 2Mb SRAM) and the SST32HF402 (4Mb Flash plus 2Mb SRAM), each packaged in a 6-by-8-by-1.4mm lead-free FBGA MCP.

Paul Lui, VP of SST's special-product group, said the ComboMemories let engineers migrate designs from standard Flash to a combined Flash/SRAM while maintaining the same footprint.

Both devices are in production, priced at $3.95 in lots of 10,000 for the SST32HF202 and $4.95 for the SST32HF402. Lead-free packaging is available at no additional cost.

EE Times

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