LSI built its own wafer fabrication, packaging and testing facilities in Milpitas as well as utilizing excess capacity at Toshiba for manufacturing - an early example of the fabless semiconductor manufacturing model. LSI Logic expanded world wide by establishing stand-alone affiliate companies in Japan, Europe and Canada. Nihon LSI Logic based in Tokyo, Japan was financed in April 1984 through a $20M private offering. LSI Logic Ltd based in Bracknell UK was financed in June 1984 by an additional $20M private placement and LSI Logic Canada based in Calgary, Alberta went public on the Toronto stock exchange. Each affiliate sought to develop independent manufacturing facilities through alliances, purchases or independent development. In 1985, the firm entered into a joint venture with Kawasaki Steel - Japan's third largest steel manufacturer - to build a $100M wafer fabrication plant in Tsukuba, Japan.
The firm developed the industry's first line of ASIC products which let customers create custom 'gate array' chips by use of leading-edge proprietary CAD tools (called LDS for 'Logic Design System'). The initial product lines were based on high-speed ECL (Emitter Coupled Logic) technology but soon switched over to high-speed CMOS (Complementary Metal Oxide Semiconductor) which offered much lower cost and lower power to system designers. Over time, LSI Logic increased its product offerings and IP library through pioneering efforts in the areas of standard cells, structured arrays, DSPs and microprocessors (MIPS and SPARC) as it moved toward the complete design and development of "Systems on a Chip" solutions.
As the ASIC market matured, third party design tools became preeminent and with the very high cost of fab development, the foundry fab model gained momentum and LSI returned in 2005 to a fabless semiconductor business. During its ASIC years, LSI Logic invested in core technologies such as microprocessors, communication devices, and video compression devices such as MPEG. These core technologies have been used together with acquisitions to better place the firm as an intellectual property owner. In 1998 it bought Symbios Logic from Hyundai. In March 2001 LSI acquired C-Cube for $878M in stock. In 2006, the firm celebrated its 25th year of business.
On April 2, 2007, LSI completed its merger with Agere Systems, and rebranded the firm from LSI Logic Corporation to LSI Corporation. It is listed on the NYSE with the ticker symbol LSI.
In April, 2008 LSI formed the MSBG Alliance with Nortel Corporation, Accton Technology Corporation, Telrad Networks Ltd., Aricent Inc., Nakina Systems Inc., Dimark Technologies, Inc., VIA Technologies, Inc., Infineon Technologies AG, and Mediatrix Telecom.