LSI LOGIC CORP
424B1, 1995-07-12
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
 
                                            Filed Pursuant to Rule 424(b)(1)
PROSPECTUS                                  Registration Statement No. 33-60621
 
                                5,000,000 SHARES
 
                        [logo]   LSI LOGIC CORPORATION
                                  COMMON STOCK
 
                            ------------------------
 
     All of the 5,000,000 shares of Common Stock offered hereby are being sold
by LSI Logic Corporation
(the "Company").
 
   
     The Company's Common Stock is traded on the New York Stock Exchange
("NYSE") under the symbol "LSI." On July 11, 1995, the last reported sale price
of the Company's Common Stock on the NYSE was $44.50 per share. See "Price Range
of Common Stock."
    
                            ------------------------
 
     See "Risk Factors" at page 4 for certain factors relevant to an investment
in the Common Stock offered hereby.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
    AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
         SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
             ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
   
                    TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<S>                             <C>                    <C>                    <C>
- -----------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------
                                       Price to        Underwriting Discounts       Proceeds to
                                        Public           and Commissions(1)         Company(2)
- -----------------------------------------------------------------------------------------------------
 
Per Share.......................         $44.50                 $1.55                 $42.95
- -----------------------------------------------------------------------------------------------------
Total(3)........................      $222,500,000           $7,750,000            $214,750,000
- -----------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) The Company has agreed to indemnify the Underwriters against certain
    liabilities, including liabilities under the Securities Act of 1933, as
    amended. See "Underwriting."
 
(2) Before deducting estimated expenses of $300,000 payable by the Company.
 
   
(3) The Company has granted the Underwriters a 30-day option to purchase up to
    750,000 additional shares of Common Stock on the same terms and conditions
    as set forth above, solely to cover over-allotments, if any. If such option
    is exercised in full, the total Price to Public, Underwriting Discounts and
    Commissions and Proceeds to Company will be $255,875,000, $8,912,500 and
    $246,962,500, respectively. See "Underwriting."
    
 
                            ------------------------
 
   
     The shares of Common Stock offered by this Prospectus are offered by the
Underwriters subject to prior sale, to withdrawal, cancellation or modification
of the offer without notice, to delivery to and acceptance by the Underwriters
and to certain other conditions. It is expected that delivery of the
certificates for the shares of Common Stock will be made at the offices of
Lehman Brothers Inc., New York, New York, on or about July 17, 1995.
    
                            ------------------------
 
LEHMAN BROTHERS
            MERRILL LYNCH & CO.
                         MONTGOMERY SECURITIES
                                    PRUDENTIAL SECURITIES INCORPORATED
   
July 11, 1995
    
<PAGE>   2
 
                             AVAILABLE INFORMATION
 
     LSI Logic Corporation is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy and information statements and other
information with the Securities and Exchange Commission (the "Commission").
Reports, proxy statements and other information filed by the Company with the
Commission pursuant to the Exchange Act may be inspected and copied at the
public reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the Commission's regional offices
located at Seven World Trade Center, 13th Floor, New York, New York 10048 and at
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661.
Copies of such material also can be obtained from the Public Reference Branch of
the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates. Such reports, proxy statements and other information can also be
inspected at the offices of the New York Stock Exchange, Inc., 20 Broad Street,
New York, New York 10005.
 
     The Company has filed with the Commission a registration statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"). This Prospectus does not contain all of the information set
forth in the Registration Statement, certain parts of which are omitted in
accordance with the rules and regulations of the Commission. For further
information, reference is hereby made to the Registration Statement.
 
                     INFORMATION INCORPORATED BY REFERENCE
 
     The following documents filed with the Commission (File No. 0-11674)
pursuant to the Exchange Act are incorporated herein by reference:
 
     1. The Company's Annual Report on Form 10-K for the fiscal year ended
        January 1, 1995 filed pursuant to Section 13 of the Exchange Act.
 
     2. The Company's Definitive Proxy Statement dated March 27, 1995 in
        connection with the Annual Meeting of Stockholders held May 12, 1995
        filed pursuant to Section 14 of the Exchange Act.
 
     3. The Company's Quarterly Report on Form 10-Q for the quarter ended April
        2, 1995 filed pursuant to Section 13 of the Exchange Act.
 
     4. The description of the Company's Common Stock contained in its
        Registration Statement on Form 8-A filed with the Commission on August
        29, 1989 pursuant to Section 12(b) of the Exchange Act.
 
     5. The description of the Company's Preferred Shares Purchase Rights
        contained in its Registration Statement on Form 8-A filed with the
        Commission on November 21, 1988 pursuant to Section 12(a) of the
        Exchange Act.
 
     6. All reports and other documents subsequently filed by the Company
        pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after
        the date of this Prospectus and prior to the termination of this
        offering. Any statement incorporated herein shall be deemed to be
        modified or superseded for purposes of this Prospectus to the extent
        that a statement contained herein, in a Prospectus Supplement or in any
        other subsequently filed document which also is or is deemed to be
        incorporated by reference herein modifies or supersedes such statement.
        Any statement so modified or superseded shall not be deemed, except as
        so modified or superseded, to constitute a part of the Registration
        Statement or this Prospectus.
 
     The Company will provide without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, upon the written or oral
request of such person, a copy of any and all of the documents which are
incorporated herein by reference (other than exhibits to such documents, unless
such exhibits are specifically incorporated by reference into such document).
Requests for such documents should be directed to LSI Logic Corporation,
Investor Relations, 1551 McCarthy Boulevard, Mail Stop D-105, Milpitas,
California 95035, or by calling (408) 433-8585.
 
                            ------------------------
 
     The LSI Logic logo and CoreWare are registered trademarks of the Company.
All other brand names or trademarks appearing in this Prospectus are the
property of their respective holders.
 
   
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH
TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK EXCHANGE OR OTHERWISE. SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
    
 
                                        2
<PAGE>   3
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and consolidated financial statements, including notes thereto,
appearing elsewhere in, or incorporated by reference into, this Prospectus.
Unless otherwise indicated, the information contained in this Prospectus (i)
assumes no exercise of the Underwriters' over-allotment option, (ii) gives
effect to a 2-for-1 stock split in the form of a dividend paid on June 21, 1995
and (iii) reflects the amendment to the Company's Certificate of Incorporation
to increase the Company's authorized Common Stock effected in May 1995.
 
                                  THE COMPANY
 
     LSI Logic Corporation (the "Company") is a leader in the design,
development, manufacture and marketing of high performance application-specific
integrated circuits ("ASICs"). The Company uses advanced process technology and
computer-aided design methodology to design and develop highly complex ASICs and
other integrated circuits. The Company's sub-micron process technologies
combined with its product libraries, including CoreWare libraries, provide the
Company with the ability to integrate system level solutions on a single chip.
 
     The Company focuses its product marketing strategy primarily on original
equipment manufacturers in the electronic data processing, telecommunications
and certain office automation industries and, within these industries,
emphasizes digital video, networking, desktop and personal computing and
wireless communication applications. The Company increasingly directs its
marketing and selling efforts towards a limited number of customers that are
acknowledged industry leaders in these markets. The Company's customers include
Alcatel NV, AT&T, Cisco Systems, Inc., Compaq Computer Corporation, Digital
Equipment Corporation, Hewlett-Packard Company, International Business Machines
Corporation, Intel Corporation, Matsushita Electric Industrial Co., Ltd.,
Newbridge Networks Corporation, Siemens AG, Silicon Graphics, Inc., Sony
Corporation ("Sony") and Sun Microsystems, Inc.
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock offered by the Company..........  5,000,000 shares
Common Stock to be outstanding after the
  offering...................................  126,406,212 shares(1)
NYSE Symbol..................................  LSI
Use of Proceeds..............................  Capital expenditures and general corporate purposes.
                                               See "Use of Proceeds."
</TABLE>
 
- ---------------
 
   
(1) Based on shares outstanding at March 31, 1995. Excludes 9,514,341 shares
    issuable as of March 31, 1995 upon exercise of options granted under the
    Company's 1991 Equity Incentive Plan, 1982 Incentive Stock Option Plan and
    1986 Directors' Stock Option Plan. Also excludes 11,734,700 shares reserved
    for issuance upon conversion of the Company's 5 1/2% Convertible
    Subordinated Notes due 2001.
    
 
                                        3
<PAGE>   4
 
                                  RISK FACTORS
 
     In addition to the other information in this Prospectus and incorporated
herein by reference, the following factors should be carefully considered in
evaluating the Company and its business before purchasing shares of Common Stock
offered hereby.
 
     DEPENDENCE ON NEW PROCESS TECHNOLOGIES AND PRODUCTS. The Company believes
that its future success depends, in part, on its ability to improve its existing
technologies and to develop and implement new process technologies in order to
continue to reduce semiconductor die size, improve device performance and
manufacturing yields, adapt products and processes to technological changes and
adopt emerging industry standards. If the Company is not able to implement new
process technologies successfully and achieve volume production of new products
at acceptable yields using new manufacturing processes, the Company's operating
results will be adversely affected. In addition, the Company must continue to
develop and introduce new products that compete effectively on the basis of
price and performance and that satisfy customer requirements. New product
development often requires long-term forecasting of market trends, development
and implementation of new processes and technologies and a substantial capital
commitment. The Company intends the CoreWare library elements it offers to be
based upon industry standard functions, protocols and interfaces, thereby
positioning them to be useful in a wide variety of systems applications. The
Company is increasingly emphasizing engineering development and acquisition of
CoreWare building blocks and integration of CoreWare libraries into its design
capabilities. There can be no assurance, however, that the cores selected for
investment of the Company's financial and engineering resources will be
developed or acquired in a timely manner or will enjoy market acceptance.
 
     MANUFACTURING RISKS. Disruption of operations at any of the Company's
primary manufacturing facilities, particularly the Company's Japanese
facilities, or any of its subcontractors for any reason, including work
stoppages, fire, earthquake or other natural disasters, would cause delays in
shipments of the Company's products. There can be no assurance that alternate
capacity, particularly wafer production capacity, would be available on a timely
basis or at all, or that if available, it could be obtained on favorable terms.
The Company has been operating most of its manufacturing facilities at or close
to capacity during the last year. Although the Company currently has plans to
increase its production capacity through the installation of new production
equipment at its manufacturing facilities, planned construction of a new
fabrication facility in the United States and technology improvements, there is
no assurance that the Company will be able to expand its manufacturing capacity
to meet expected future demand, which could result in a loss of customers and
could materially and adversely affect the Company's operating results. In
addition, if demand for the Company's products does not absorb the additional
capacity, the increase in fixed costs and operating expenses related to
increases in production capacity may materially and adversely affect the
Company's operations.
 
     FLUCTUATIONS IN OPERATING RESULTS. The Company believes that its future
operating results will continue to be subject to quarterly variations based upon
a wide variety of factors, including the cyclical nature of both the
semiconductor industry and the markets addressed by the Company's products, the
ability to develop and implement new technologies, the availability and extent
of utilization of manufacturing capacity, changes in product mix, fluctuations
in manufacturing yields, the timing of new product introductions, price erosion,
exchange rate fluctuations and other factors. As a participant in the
semiconductor industry, the Company operates in a technologically advanced,
rapidly changing and highly competitive environment. The Company predominantly
sells custom products to customers operating in a similar environment.
Accordingly, changes in the conditions of any of the Company's customers may
have a greater impact on the Company than if the Company offered standard
products that could be sold to many purchasers. While the Company cannot predict
what effect these factors may have on its financial results, the aggregate
effect of these and other factors could result in significant volatility in the
Company's future performance and stock price. To the extent the Company's
performance may not meet expectations published by external sources, public
reaction could result in a sudden and significantly adverse impact on the market
price of the Company's securities, particularly on a short-term basis.
 
   
     COMPETITION. The semiconductor industry in general and the markets in which
the Company competes in particular are intensely competitive, exhibiting both
rapid technological changes and continued price erosion. The Company's
competitors include many large domestic and foreign companies which have
substantially greater financial, technical and management resources than the
Company, as well as emerging companies attempting to sell products to
specialized markets such as those addressed by the Company.
    
 
                                        4
<PAGE>   5
 
Several major diversified electronics companies, including Fujitsu, Ltd.,
Toshiba Corporation and NEC Corporation, and a number of United States
semiconductor manufacturers, including AT&T, Motorola Inc. and Texas Instruments
Incorporated, offer ASIC products or other products which are competitive with
the product lines of the Company. In addition, there is no assurance that
certain large customers, some of whom have licensed elements of the Company's
process and product technologies, will not develop internal design and
production operations to produce their own ASICs.
 
     CAPITAL NEEDS. The semiconductor industry is extremely capital intensive
requiring continuing investments in new facilities and equipment. To remain
competitive, the Company must continue to expand its facilities and to invest in
advanced manufacturing and test equipment. During 1995, the Company expects to
make net capital expenditures of approximately $200 to $250 million. The Company
currently estimates that the cost to construct and fully equip its proposed new
facility as well as to acquire new equipment for existing facilities will
require annual capital expenditures in excess of these amounts in each of the
next several years. While the Company believes that the proceeds from this
offering, together with existing cash balances, cash flow from operations, and
available equipment lease financing will be sufficient to meet the Company's
liquidity and capital requirements for the next 12 months, there can be no
assurance that the Company will not be required to seek other financing sooner
or that such financing, if required, would be available on terms satisfactory to
the Company. In this regard, any significant adverse effect upon the Company's
cash flow from operations could accelerate the Company's need to seek additional
outside capital.
 
   
     CURRENCY RISKS. In countries in which the Company is conducting business in
a local currency, currency exchange fluctuations could adversely affect the
Company's revenues and costs. A substantial portion of the costs of the
Company's manufacturing operations are denominated in Japanese yen. In addition,
the Company purchases a substantial portion of its raw materials and equipment
from foreign suppliers and incurs labor costs in foreign locations. A portion of
these transactions are denominated in currencies other than in U.S. dollars,
principally in Japanese yen. International sales are generally denominated in
local currencies. The Company also has borrowings denominated in yen, which
totaled approximately 15 billion yen (approximately $172 million at March 31,
1995) and in June 1995 entered into a 15 billion yen lease line under which
approximately 6.2 billion yen (approximately $74 million) had been drawn down at
June 30, 1995. Such transactions and borrowings expose the Company to exchange
rate fluctuations for the period of time from inception of the transaction until
it is settled. In recent years, the yen has fluctuated substantially against the
U.S. dollar. However, the Company has entered and will from time to time enter
into hedging transactions in order to minimize exposure to currency rate
fluctuations. There can be no assurance that such hedging transactions will
minimize exposure to currency rate fluctuations or that fluctuations in currency
exchange rates in the future will not have an adverse impact on the Company's
results of operations.
    
 
     CUSTOMER CONCENTRATION. As a result of the Company's strategy to direct its
marketing and selling efforts toward selected customers, the Company expects
that it will become increasingly dependent on a limited number of customers for
a substantial portion of its revenues. During 1994 and the quarter ended March
31, 1995, approximately 58% and 62%, respectively, of the Company's net revenues
were derived from sales to its top ten customers. Sales to Sony for its
Playstation game console are expected to account for slightly in excess of 10%
of the Company's revenues during the first half of 1995. Loss of new product
design wins or cancellation of business from any of these major customers,
significant changes in scheduled deliveries to any of these customers or
decreases in the prices of products sold to any of these customers could
materially adversely affect the Company's results of operations.
 
     INTELLECTUAL PROPERTY AND TEXAS INSTRUMENTS LITIGATION. Although the
Company believes that the protection afforded by its patents, patent
applications and trademarks has value, the rapidly changing technology in the
semiconductor industry makes the Company's future success dependent primarily
upon the technical competence and creative skills of its personnel rather than
on patent and trademark protection. As is typical in the semiconductor industry,
the Company has from time to time received, and may in the future receive,
communications from other parties asserting patent rights, mask work rights,
copyrights or trademark rights that such other parties allege cover certain of
the Company's products, processes, technologies or information. Several such
assertions relating to patents are in various stages of evaluation. The Company
is considering whether to seek licenses with respect to certain of these claims.
As described below, litigation has
 
                                        5
<PAGE>   6
 
arisen with respect to one of these assertions. Based on industry practice, the
Company believes that licenses or other rights, if necessary, could be obtained
on commercially reasonable terms for such existing or future claims.
Nevertheless, no assurance can be given that licenses can be obtained, or if
obtained will be on acceptable terms or that litigation or other administrative
proceedings will not occur. The inability to obtain certain licenses or other
rights or to obtain such licenses or rights on favorable terms, or litigation
arising out of such other parties assertions, both existing and future, could
have a material adverse effect on the Company's future operating results.
 
     The Company is one of three defendants in a patent infringement suit
brought by Texas Instruments ("TI"). This suit resulted in a May 1995 jury
verdict against the Company holding the patents valid and finding wilful
infringement. Damages against the Company were set by the jury at $14.6 million,
for which the Company has adequate reserves. Because both of the patents
involved in the litigation have expired, the verdict will have no effect upon
the manufacture or sale of the Company's present or future products. The Company
has filed various post-trial motions which, if granted, could reduce the jury
award or set aside the jury verdict entirely. TI has requested treble damages,
pre-judgment interest in the amount of $7.5 million from the Company and
attorneys' fees that total $3.8 million from all parties. The Company believes
that the jury verdict was in error and intends to appeal. The Company continues
to believe that the final outcome of this matter will not have a material
adverse effect on the Company's consolidated financial position or results of
operations. No assurance can be given, however, that this matter will be
resolved without the payment of damages and other costs or that damages will not
be increased to an amount in excess of the Company's reserves, thereby having an
adverse effect on the Company.
 
     CYCLICAL NATURE OF THE SEMICONDUCTOR INDUSTRY. The semiconductor industry
is characterized by rapid technological change, rapid product obsolescence and
price erosion. The semiconductor industry historically has been characterized by
wide fluctuations in product supply and demand. From time to time the industry
also has experienced significant downturns, often in connection with, or in
anticipation of, maturing product cycles (of both the semiconductor companies
and their customers) and declines in general economic conditions. These
downturns have been characterized by diminished product demand, production
overcapacity and subsequent accelerated erosion of average selling prices, and
in some cases, have lasted for more than a year. For example, the Company
believes that its operating results were adversely affected by an industry-wide
downturn in the demand for semiconductors beginning in 1990, culminating in the
Company's 1992 restructuring charge and reorganization of its operations.
Currently, the semiconductor industry in general, including the Company, is
experiencing a period of increased demand. There is no assurance that these
conditions will continue. The Company may experience substantial
period-to-period fluctuations in future operating results due to general
industry conditions, events occurring in the worldwide economy or a significant
industry-wide downturn.
 
                                        6
<PAGE>   7
 
                                  THE COMPANY
 
     LSI Logic Corporation (the "Company") is a leader in the design,
development, manufacture and marketing of high performance application-specific
integrated circuits ("ASICs"). The Company uses advanced process technology and
computer-aided design methodology to design and develop highly complex ASICs and
other integrated circuits. The Company's sub-micron process technologies
combined with its product libraries, including CoreWare libraries, provide the
Company with the ability to integrate system level solutions on a single chip.
 
     The Company has increasingly directed its marketing and selling efforts
toward selected customers in high growth end markets that are characterized by
increasingly shortened product cycles and ongoing changes in technological
standards and performance requirements. As a result, customers in these markets
tend to benefit from the flexibility of customized ASIC design methodology to
help differentiate their products while still complying with existing and
emerging global industry standards such as Ethernet and ATM (Asynchronous
Transfer Mode) in the networking market, PCI bus interface in the personal
computer market and MPEG2 (Motion Picture Experts Group) for video compression
applications in the digital video market.
 
     The Company focuses its product marketing strategy primarily on original
equipment manufacturers in the electronic data processing, telecommunications
and certain office automation industries and, within these industries,
emphasizes digital video, networking, desktop and personal computing and
wireless communication applications. The Company increasingly directs its
marketing and selling efforts towards a limited number of customers that are
acknowledged industry leaders in these markets. The Company's customers include
Alcatel NV, AT&T, Cisco Systems, Inc., Compaq Computer Corporation, Digital
Equipment Corporation, Hewlett-Packard Company, International Business Machines
Corporation, Intel Corporation, Matsushita Electric Industrial Co., Ltd.,
Newbridge Networks Corporation, Siemens AG, Silicon Graphics, Inc., Sony
Corporation and Sun Microsystems, Inc.
 
     The Company's CoreWare product library approach and its sub-micron process
technologies permit system-level integration of functional cores or elements
including microprocessor "engines," logic blocks (including industry-standard
functions, protocols and interfaces), memory and customer-specific proprietary
logic functions on a single piece of silicon. Examples of these elements include
the MIPS microprocessor core family and cores implementing Ethernet, MPEG, JPEG
and ATM standards. This methodology enables customers to improve the
performance, reliability and further differentiate their products while
shortening product development cycles, lowering development costs and optimizing
the customer's application.
 
     The Company's proprietary computer-aided design tools are highly integrated
with the Company's manufacturing process requirements, thereby providing high
predictability that a product's physical performance will mirror the computer
simulation of the chip and affording high predictability of performance of
products developed using the Company's design methodology. The Company's
sophisticated design tools, advanced process technology and sub-micron
manufacturing capability are intended to provide customers with highly
integrated solutions that work right the first time.
 
     The Company provides customers with a comprehensive approach and a
continuum of solutions for the design and manufacture of leading-edge ASICs.
This allows customers substantial flexibility in how they proceed with an ASIC
design project. A customer may establish product specifications for
implementation into a particular chip design by the customer's engineers, by the
Company's engineers on a "turn-key" basis or through a collaborative effort. The
Company's design environment includes expanded interface capabilities to certain
third-party EDA software design tools from companies such as Cadence Design
Systems, Inc., Mentor Graphics Corporation and Synopsys, Inc.
 
     The Company has developed and uses advanced manufacturing process
technologies, including 0.6-micron and 0.5-micron CMOS processes, for its
advanced product offerings. As process technology becomes more sophisticated,
allowing greater density and increased functionality on a single chip, the
system-on-a-chip is becoming the foundation of the Company's approach to the
marketplace.
 
     The Company believes that owning its wafer manufacturing facilities not
only provides better access to capacity but also improves quality,
cost-effectiveness, responsiveness to customers, ability to implement
 
                                        7
<PAGE>   8
 
leading-edge process technology and time-to-market as compared to companies that
do not own their own wafer fabrication facilities. The Company's manufacturing
operations are located in the United States, Japan and Hong Kong. The Company
performs substantially all of its packaging, assembly and final test operations
through third-party subcontractors in various locations. During 1994, the
Company's United States production operations received ISO-9002 certification,
an important international measure for quality.
 
     The Company markets its products and services on a worldwide basis through
its direct sales, marketing and field technical staff of approximately 750
employees (including its majority-owned subsidiaries in Europe, Canada and
Japan) and through independent sales representatives and distributors. The
Company operates over 25 design centers around the world to assist customers in
product design activities. The Company's network of design centers allows the
Company to provide its customers with highly experienced engineers to interact
with its customers' engineering management and system architects to develop
designs for new products and to provide continuing after-sale customer support.
 
     The Company was incorporated in California on November 6, 1980 and
reincorporated in Delaware on June 11, 1987. Its principal offices are located
at 1551 McCarthy Boulevard, Milpitas, California 95035, and its telephone number
at that location is (408) 433-8000. Except where otherwise indicated, references
to the "Company" means LSI Logic Corporation and its subsidiaries.
 
                                        8
<PAGE>   9
 
                                USE OF PROCEEDS
 
   
     The net proceeds from the sale of Common Stock offered hereby are estimated
to be $214,450,000 ($246,662,500 if the Underwriters' over-allotment option is
exercised in full) at the public offering price of $44.50 per share and after
deducting the estimated underwriters' discounts and commissions and expenses
payable by the Company in connection with the offering. The Company intends to
use such net proceeds primarily for capital expenditures, principally to
purchase equipment for its existing manufacturing facilities and to commence
construction of a new 8-inch wafer fabrication facility in the United States,
and for general corporate purposes. During 1995, the Company expects to make net
capital expenditures of approximately $200 to $250 million, approximately
one-half of which has been spent to date. In addition, the Company, from time to
time, may consider acquisitions of, or investments in, complementary businesses,
assets or technologies. At the present time, however, the Company has no
agreements or understandings, nor are there any negotiations pending, with
respect to any material acquisitions. The Company believes that the net proceeds
from the sale of the Common Stock in this offering, together with existing cash
balances, cash flow from operations and available equipment lease financing,
will be sufficient to meet the Company's liquidity and capital requirements for
the next 12 months. The Company believes that success in its industry requires
substantial financial strength and flexibility. Accordingly, the Company may
seek additional equity or debt financing to fund the completion of its planned
8-inch wafer fabrication facility, further expansion of its existing fabrication
capacity or for other purposes. Pending such uses, the Company will invest the
net proceeds in short- or medium-term income producing investments.
    
 
                                DIVIDEND POLICY
 
     The Company has paid no cash dividends on its Common Stock since its
incorporation and anticipates that for the foreseeable future it will continue
to retain any earnings for use in its business.
 
                          PRICE RANGE OF COMMON STOCK
 
     The Company's Common Stock is traded on the NYSE under the symbol LSI. The
following table sets forth, for the periods indicated, high and low sale prices
for the Common Stock on the NYSE.
 
   
<TABLE>
<CAPTION>
                                                                        HIGH         LOW
                                                                        ---          ---
        <S>                                                           <C>         <C>
        FISCAL 1993
          First Quarter.............................................  $ 7 1/16     $ 5 1/8
          Second Quarter............................................    7 3/4        5 1/4
          Third Quarter.............................................    9 5/8        7 1/8
          Fourth Quarter............................................    8 9/16       6 1/2
        FISCAL 1994
          First Quarter.............................................   11 1/2        7 3/4
          Second Quarter............................................   13 3/16       8 3/8
          Third Quarter.............................................   17 7/8       11 7/16
          Fourth Quarter............................................   22 11/16     17 5/16
        FISCAL 1995
          First Quarter.............................................   29 3/16      18 1/4
          Second Quarter............................................   42 5/8       25 1/2
          Third Quarter (through July 11, 1995).....................   47 3/4       39 1/4
</TABLE>
    
 
   
     On July 11, 1995, the last reported sale price of the Common Stock on the
NYSE was $44.50 per share.
    
 
                                        9
<PAGE>   10
 
                                 CAPITALIZATION
 
   
     The following table sets forth the consolidated short-term debt and
capitalization of the Company at March 31, 1995 and as adjusted to give effect
to the issuance and sale by the Company of the 5,000,000 shares of Common Stock
offered hereby at the public offering price of $44.50 per share, and the
application of the estimated net proceeds therefrom. The financial data in the
following table should be read in conjunction with the Company's audited
consolidated financial statements (and notes thereto) at December 31, 1994 and
the Company's unaudited consolidated condensed quarterly financial statements
(and notes thereto) at March 31, 1995, incorporated herein by reference.
    
 
   
<TABLE>
<CAPTION>
                                                                      AS OF MARCH 31, 1995
                                                                --------------------------------
                                                                  ACTUAL             AS ADJUSTED
                                                                ----------           -----------
                                                                  (IN THOUSANDS, EXCEPT SHARE
                                                                AMOUNTS)
<S>                                                             <C>                  <C>
Current portion of long-term debt, capital lease obligations
  and short-term borrowings(1)................................  $   44,013           $    44,013
                                                                 =========             =========
Long-term debt, capital lease obligations and other
  long-term liabilities, less current portion(1)..............  $  295,806           $   295,806
                                                                ----------           -----------
Minority interest in subsidiaries.............................      29,009                29,009
                                                                ----------           -----------
Stockholders' equity(2):
  Preferred Stock, $.01 par value, 2,000,000 shares
     authorized, none outstanding.............................          --                    --
  Common Stock, $.01 par value, 250,000,000 shares authorized,
     121,406,212 shares issued and outstanding, 126,406,212
     shares
     issued and outstanding as adjusted.......................         607                   657
  Additional paid-in capital..................................     565,437               779,837
  Retained earnings...........................................     112,329               112,329
  Cumulative translation adjustment...........................     112,487               112,487
                                                                ----------           -----------
     Total stockholders' equity...............................     790,860             1,005,310
                                                                ----------           -----------
          Total capitalization................................  $1,115,675           $ 1,330,125
                                                                 =========             =========
</TABLE>
    
 
- ---------------
 
(1) For additional information regarding short-term debt, long-term debt and
    stockholders' equity, see Notes 6 and 7 of Notes to Consolidated Financial
    Statements included in the Company's Annual Report on Form 10-K for the
    fiscal year ended January 1, 1995. See "Incorporation of Certain Documents
    by Reference."
 
(2) Excludes, as of March 31, 1995, (i) 7,841,692 shares reserved for issuance
    upon exercise of outstanding options granted under the Company's 1991 Equity
    Incentive Plan and 174,536 shares which remain available for future grant
    under such plan, (ii) 1,492,649 shares reserved for issuance upon exercise
    of outstanding options under the Company's 1982 Incentive Stock Option Plan,
    (iii) approximately 997,878 shares reserved for issuance under the Company's
    Employee Stock Purchase Plan and (iv) 180,000 shares reserved for issuance
    upon exercise of outstanding options granted under the 1986 Directors' Stock
    Option Plan and 67,500 shares which remain available for future grant under
    such plan. Also excludes 11,734,700 shares of Common Stock reserved for
    issuance upon conversion of the Company's 5 1/2% Convertible Subordinated
    Notes due 2001, which Notes are convertible at any time at a rate of one
    share of Common Stock per $12.25 principal amount of Notes converted,
    subject to adjustment in certain circumstances. Excludes 100,000 shares of
    Preferred Stock reserved for issuance in certain circumstances in connection
    with the Company's Preferred Shares Rights Agreement dated as of November
    16, 1988.
 
                            -----------------------------
 
   
     During the second quarter of 1995, the Company, through its Japanese
subsidiary, entered into a 15 billion yen (approximately $179 million) operating
lease line, approximately 6.2 billion yen (approximately $74 million) of which
had been drawn down at June 30, 1995. This lease line will be used to lease
equipment for the Company's Japanese manufacturing facility.
    
 
                                       10
<PAGE>   11
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The selected consolidated financial data presented below for, and as of the
end of, each of the years in the five-year period ended December 31, 1994 have
been derived from the consolidated financial statements of the Company, which
have been audited by Price Waterhouse LLP, independent accountants. The selected
consolidated financial data presented below at March 31, 1995 and for the
quarter then ended and for each of the four fiscal quarters of 1993 and of 1994
have been derived from unaudited consolidated financial statements of the
Company. In the opinion of the Company's management, the unaudited consolidated
financial statements include all adjustments, consisting of only normal
recurring adjustments, necessary to fairly state the information set forth
therein. Such data should be read in conjunction with the consolidated financial
statements, related notes and other financial information incorporated by
reference herein. See "Incorporation of Certain Documents by Reference."
 
<TABLE>
<CAPTION>
                                                                                                            THREE MONTHS ENDED
                                                                YEAR ENDED DECEMBER 31,                          MARCH 31,
                                                -------------------------------------------------------   -----------------------
                                                  1990       1991       1992        1993        1994         1994         1995
                                                --------   --------   ---------   --------   ----------   ----------   ----------
                                                                                                                (UNAUDITED)
<S>                                             <C>        <C>        <C>         <C>        <C>          <C>          <C>
                                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
STATEMENT OF OPERATIONS DATA(1):
Revenues......................................  $655,491   $697,838   $ 617,468   $718,812   $  901,830   $  193,812   $  280,158
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Costs and expenses:
  Cost of revenues............................   443,759    457,692     408,318    438,523      520,150      115,387      153,399
  Research and development....................    60,196     80,802      78,825     78,995       98,978       23,141       24,378
  Selling, general and administrative.........   117,318    136,811     129,254    117,452      124,936       29,457       39,335
  Restructuring of operations.................    44,000      5,626     101,785         --           --           --           --
                                                --------   --------   ---------   --------   ----------   ----------   ----------
    Total costs and expenses..................   665,273    680,931     718,182    634,970      744,064      167,985      217,112
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Income (loss) from operations.................    (9,782)    16,907    (100,714)    83,842      157,766       25,827       63,046
Interest expense..............................   (21,256)   (19,371)    (11,567)    (9,621)     (18,455)      (3,788)      (4,183)
Interest income and other.....................    12,517     14,722      12,413      6,500       16,858        4,798        5,481
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Income (loss) before income taxes, minority
  interest and extraordinary credit...........   (18,521)    12,258     (99,868)    80,721      156,169       26,837       64,344
Provision for income taxes....................    11,685      6,129       8,521     24,221       43,679        7,514       18,016
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Income (loss) before minority interest and
  extraordinary credit........................   (30,206)     6,129    (108,389)    56,500      112,490       19,323       46,328
Minority interest in net income (loss) of
  subsidiaries................................     1,065     (2,212)      1,819      2,750        3,747          (32)       1,068
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Income (loss) before extraordinary credit.....   (31,271)     8,341    (110,208)    53,750      108,743       19,355       45,260
Extraordinary credit resulting from the
  retirement of debt..........................       955         --          --         --           --           --           --
                                                --------   --------   ---------   --------   ----------   ----------   ----------
Net income (loss).............................  $(30,316)  $  8,341   $(110,208)  $ 53,750   $  108,743   $   19,355   $   45,260
                                                ========   ========   =========   ========    =========    =========    =========
Primary income (loss) per share:
  Net income (loss) before extraordinary
    credit....................................  $  (0.37)  $   0.10   $   (1.24)  $   0.55   $     0.99   $     0.19   $     0.37
  Extraordinary credit........................      0.01         --          --         --           --           --           --
                                                --------   --------   ---------   --------   ----------   ----------   ----------
  Net income (loss) per share.................  $  (0.36)  $   0.10   $   (1.24)  $   0.55   $     0.99   $     0.19   $     0.37
                                                ========   ========   =========   ========    =========    =========    =========
  Fully diluted net income per share..........         *          *           *   $   0.52   $     0.93   $     0.18   $     0.35
                                                                                  ========    =========    =========    =========
Common shares and common share equivalents
  used in computing per share amounts:
  Primary.....................................    84,126     86,752      88,956     99,062      109,906      103,262      120,770
                                                ========   ========   =========   ========    =========    =========    =========
  Fully diluted...............................         *          *           *    109,626      125,428      115,164      132,640
                                                                                  ========    =========    =========    =========
</TABLE>
 
<TABLE>
<CAPTION>
                                                                              AS OF DECEMBER 31,
                                                           ---------------------------------------------------------   MARCH 31,
                                                             1990       1991        1992        1993         1994         1995
                                                           --------   ---------   --------   ----------   ----------   ----------
                                                                                       (IN THOUSANDS)
<S>                                             <C>        <C>        <C>         <C>        <C>          <C>          <C>
BALANCE SHEET DATA(2):
Working capital...............................             $231,248   $ 225,193   $133,640   $  230,513   $  422,916   $  430,615
Total assets..................................              771,682     748,456    747,438      859,010    1,270,374    1,505,145
Long-term debt, capital lease obligations and
  other long-term liabilities.................              189,795     166,107    218,837      246,314      288,496      295,806
Stockholders' equity..........................              267,729     293,075    197,728      292,434      544,906      790,860
</TABLE>
 
                                       11
<PAGE>   12
 
QUARTERLY FINANCIAL DATA(2):
 
<TABLE>
<CAPTION>
                                                   1993                                        1994                        1995
                                 -----------------------------------------   -----------------------------------------   --------
                                  FIRST      SECOND     THIRD      FOURTH     FIRST      SECOND     THIRD      FOURTH     FIRST
                                 QUARTER    QUARTER    QUARTER    QUARTER    QUARTER    QUARTER    QUARTER    QUARTER    QUARTER
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                              <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues.......................  $168,928   $177,080   $183,761   $189,043   $193,812   $212,106   $240,218   $255,694   $280,158
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
Costs and expenses:
  Cost of revenues.............   103,921    108,246    112,001    114,355    115,387    123,337    138,219    143,207    153,399
  Research and development.....    18,998     19,408     19,134     21,455     23,141     22,467     26,834     26,536     24,378
  Selling, general and
    administrative.............    29,205     29,007     29,910     29,330     29,457     31,102     30,645     33,732     39,335
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
    Total costs and expenses...   152,124    156,661    161,045    165,140    167,985    176,906    195,698    203,475    217,112
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
Income from operations.........    16,804     20,419     22,716     23,903     25,827     35,200     44,520     52,219     63,046
Interest expense...............    (2,175)    (2,384)    (2,538)    (2,524)    (3,788)    (5,665)    (4,822)    (4,180)    (4,183)
Interest income and other......     1,697      2,512      1,818        473      4,798      4,127      3,263      4,670      5,481
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
Income before income taxes and
  minority interest............    16,326     20,547     21,996     21,852     26,837     33,662     42,961     52,709     64,344
Provision for income taxes.....     4,901      6,164      6,599      6,557      7,514      9,425     12,028     14,712     18,016
Minority interest in net income
  (loss) of subsidiaries.......       814      1,313      1,022       (399)       (32)       799      1,465      1,515      1,068
                                 --------   --------   --------   --------   --------   --------   --------   --------   --------
Net income.....................  $ 10,611   $ 13,070   $ 14,375   $ 15,694   $ 19,355   $ 23,438   $ 29,468   $ 36,482   $ 45,260
                                 ========   ========   ========   ========   ========   ========   ========   ========   ========
Primary net income per share...  $   0.11   $   0.14   $   0.15   $   0.16   $   0.19   $   0.22   $   0.26   $   0.31   $   0.37
                                 ========   ========   ========   ========   ========   ========   ========   ========   ========
Fully diluted net income per
  share........................         *          *          *   $   0.15   $   0.18   $   0.21   $   0.25   $   0.30   $   0.35
                                                                  ========   ========   ========   ========   ========   ========
Common shares and common share
  equivalents used in computing
  per share amounts
  Primary......................    94,904     97,748    100,498    101,872    103,262    106,224    112,788    117,702    120,770
                                 ========   ========   ========   ========   ========   ========   ========   ========   ========
  Fully diluted................         *          *          *    112,084    115,164    128,102    127,876    129,436    132,640
                                                                  ========   ========   ========   ========   ========   ========
</TABLE>
 
- ---------------
 
  * Fully diluted amount disclosures are not required because they are
    substantially the same as primary amounts disclosed for these periods.
 
(1) The Company's fiscal year ends on the Sunday closest to December 31. For
    presentation purposes, the consolidated financial statements refer to
    December 31 as year end. Fiscal 1993 was a 53-week year, whereas, 1994, 1992
    and 1990 were 52-week years. The fourth quarter of 1993 was a 14-week
    quarter, whereas the first, second and third quarters were 13-week quarters.
    The additional week in the fourth quarter of 1993 did not have a material
    impact on the Company's results of operations.
 
(2) Certain reclassifications have been made to the 1992 and 1993 consolidated
    financial statements to conform to the 1994 presentation. Such
    reclassifications had no effect on results of operations or stockholders'
    equity.
 
                            ------------------------
 
     As of March 31, 1995, the Company had remaining restructuring reserves of
approximately $14.6 million relating to the phase down of its Fremont
development facility and the phase out of its Milpitas manufacturing facility.
During the second quarter, the Company determined to continue to operate its
Milpitas facility and completed the phase down of the Fremont facility and, as a
result, expects to significantly reduce such reserves during the quarter ending
June 30, 1995. The Company also expects, however, that such reduction in
reserves will be substantially offset by increases in its restructuring reserves
for other corporate matters, including the $14.6 million jury verdict against
the Company during the quarter ending June 30, 1995 in the Texas Instruments
litigation. See "Risk Factors -- Intellectual Property and Texas Instruments
Litigation." Accordingly, the Company does not expect that these events will
have a material effect on its net income for the quarter ending June 30, 1995.
 
                                       12
<PAGE>   13
 
                                  UNDERWRITING
 
     The Underwriters named below (the "Underwriters") have severally agreed,
subject to the terms and conditions of the Underwriting Agreement (the form of
which is filed as an exhibit to the Registration Statement of which this
Prospectus is a part), to purchase from the Company, and the Company has agreed
to sell to each Underwriter, the aggregate number of shares of Common Stock set
forth opposite their respective names below:
 
   
<TABLE>
<CAPTION>
                                                                            NUMBER OF
                                       NAME                                  SHARES
        ------------------------------------------------------------------  ---------
        <S>                                                                 <C>
        Lehman Brothers Inc. .............................................  1,250,000
        Merrill Lynch, Pierce, Fenner & Smith
                     Incorporated.........................................  1,250,000
        Montgomery Securities.............................................  1,250,000
        Prudential Securities Incorporated................................  1,250,000
                                                                            ---------
                  Total...................................................  5,000,000
                                                                             ========
</TABLE>
    
 
     The Underwriting Agreement provides that the obligations of the
Underwriters to purchase shares of Common Stock are subject to certain
conditions, and that if any of the foregoing shares of Common Stock are
purchased by the Underwriters pursuant to the Underwriting Agreement, all shares
of Common Stock agreed to be purchased by the Underwriters pursuant to the
Underwriting Agreement must be so purchased.
 
   
     The Company has been advised that the Underwriters propose to offer the
shares of Common Stock directly to the public initially at the public offering
price set forth on the cover page of this Prospectus, and to certain selected
dealers (who may include the Underwriters) at such public offering price less a
concession not in excess of $.93 per share. The Underwriters may allow and the
selected dealers may reallow a concession not in excess of $.10 per share to
certain other brokers and dealers. After the public offering, the public
offering price, the concession to selected dealers and the reallowance to other
dealers may be changed by the Underwriters.
    
 
     The Company has granted to the Underwriters an option to purchase up to an
additional 750,000 shares of Common Stock at the public offering price, less the
aggregate underwriting discounts and commissions, shown on the cover page of
this Prospectus, solely to cover over-allotments, if any. The option may be
exercised at any time up to 30 days after the date of this Prospectus. To the
extent that the Underwriters exercise such option, each of the Underwriters will
be committed, subject to certain conditions, to purchase a number of option
shares proportionate to such Underwriter's initial commitment.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments that the Underwriters may be required to make in respect thereof.
 
     The Company has agreed that without the written consent of the
Underwriters, it will not offer, sell, contract to sell or otherwise dispose of
any shares of Common Stock or any securities, convertible or exchangeable
therefor, for a period of 90 days from the date of this Prospectus, subject to
limited exceptions.
 
     The Company's directors and executive officers, who collectively held as of
March 14, 1995 an aggregate of 7,867,360 shares of Common Stock and options to
purchase Common Stock, have agreed that without the consent of the Underwriters
they will not offer, sell, contract to sell or otherwise dispose of any shares
of Common Stock or any securities convertible into or exchangeable therefor for
a period of 30 days from the date of this Prospectus.
 
     From time to time, certain of the Underwriters or their affiliates have
provided, and may continue to provide, investment banking services to the
Company.
 
                                       13
<PAGE>   14
 
                                 LEGAL MATTERS
 
     The validity of the securities offered hereby will be passed upon for the
Company by Wilson, Sonsini, Goodrich & Rosati, Professional Corporation
("WSGR"), Palo Alto, California, and for the Underwriters by Brobeck, Phleger &
Harrison, Palo Alto, California. Larry W. Sonsini, a member of WSGR, is an
Assistant Secretary of the Company.
 
                                    EXPERTS
 
     The consolidated financial statements incorporated in this Prospectus by
reference to the Annual Report on Form 10-K for the year ended December 31,
1994, have been so incorporated in reliance on the report of Price Waterhouse
LLP, independent accountants, given on the authority of said firm as experts in
auditing and accounting.
 
                                       14
<PAGE>   15
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     No person has been authorized to give any information or to make any
representations other than those contained in this Prospectus, and, if given or
made, such information or representations must not be relied upon as having been
authorized. This Prospectus does not constitute an offer to sell or the
solicitation of an offer to buy any securities other than the securities to
which it relates or an offer to sell or a solicitation of an offer to buy such
securities in any circumstances in which such offer or solicitation is unlawful.
Neither the delivery of this Prospectus nor any sale made hereunder shall, under
any circumstances, create any implication that there has been no change in the
affairs of the Company since the date hereof or that the information contained
herein is correct as of any time subsequent to its date.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                         PAGE
                                         -----
<S>                                      <C>
Available Information...................     2
 
Information Incorporated by Reference...     2
 
Prospectus Summary......................     3
 
Risk Factors............................     4
 
The Company.............................     7
 
Use of Proceeds.........................     9
 
Dividend Policy.........................     9
 
Price Range of Common Stock.............     9
 
Capitalization..........................    10
 
Selected Consolidated Financial Data....    11
 
Underwriting............................    13
 
Legal Matters...........................    14
 
Experts.................................    14
</TABLE>
 
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
 
                                5,000,000 SHARES
 
                                  COMMON STOCK
                          ---------------------------
 
                                   PROSPECTUS
   
                                 July 11, 1995
    
 
                          ---------------------------
 
                                LEHMAN BROTHERS
 
                              MERRILL LYNCH & CO.
 
                             MONTGOMERY SECURITIES
 
                       PRUDENTIAL SECURITIES INCORPORATED
 
- ------------------------------------------------------
- ------------------------------------------------------


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