Silicon Storage Technology Inc. today will introduce a multichip package (MCP) family of 32- to 64Mbit NOR flash memory combined with pseudo SRAM (PSRAM) chips ranging from 4 to 32Mbits.
The latest additions to SST's ComboMemory line, Series 32 is designed for cellular handsets, PDAs, wireless modems, and set-top boxes.
The Sunnyvale, Calif., company is sampling the MCPs with 32Mbits of flash and either 4 or 8Mbits of PSRAM. An MCP with 32Mbits of flash and 16Mbits of PSRAM will sample in September. ComboMemory of 64Mbit flash and PSRAM from 8 to 32Mbits is slated to sample in the first quarter of 2004.
Paul Lui, vice president of special products at SST, said that the MCP with 64Mbits of flash will follow the introduction later this year of the company's first discrete flash chip in that density.
Lui said the the ComboMemory line is using PSRAM for the first time to achieve lower cost at higher densities.
"Conventional 6T SRAMs become too expensive at densities above 8Mbits," he said. SST's new line offers 4- and 8Mbit 6T SRAMs packaged with NOR flash if desired. The MCPs also offer the option of either 70- or 90ns access time for both flash and PSRAM.
The family comes in a 20% smaller 63-ball TFBGA package measuring 8 ¥ 10 ¥ 1.2mm, or a 62-ball LFBGA measuring 8 ¥ 10 ¥ 1.4mm.
The SST packages are assembled and tested by FIC of Taiwan, and the flash components are manufactured by foundry partners Samsung Electronics, Taiwan Semiconductor Manufacturing, and Vanguard International Semiconductor. The PSRAMs are from an unnamed foundry partner.
Initial production of the Series 32 MCPs will use SST's Multi-Purpose Flash die, but later in the quarter will be produced with the company's Multi-Purpose Flash Plus units. The MPF+ chips have special features such as erase suspend/erase resume, boot-block write protection, and two 128-bit security ID registers.
The flash has a sector size of 2,000 words. Power consumption is 15mA typical for active current and 5µA typical for flash or PSRAM read and standby current.
The new family has chip erase of 40ms during customer manufacturing operations, which is 1,000 times faster than conventional MCPs, according to Lui.
The company's 32Mbit flash with 8Mbit PSRAM is sampling at $8 in quantities of 10,000, and the 32Mbit flash with 4Mbit PSRAM is $7 in the same quantities.