LSI LOGIC CORP
S-3, 1995-06-27
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 27, 1995
 
                                                     REGISTRATION NO. 33-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                             LSI LOGIC CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                             <C>                             <C>
            DELAWARE                1551 MCCARTHY BOULEVARD                94-2712976
(STATE OR OTHER JURISDICTION OF    MILPITAS, CALIFORNIA 95035           (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)          (408) 433-8000               IDENTIFICATION NO.)
</TABLE>
 
         (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING
            AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                                DAVID E. SANDERS
                 VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                             LSI LOGIC CORPORATION
                            1551 MCCARTHY BOULEVARD
                           MILPITAS, CALIFORNIA 95035
                                 (408) 433-8000
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------
                                   COPIES TO:
 
<TABLE>
<S>                                             <C>
                LARRY W. SONSINI                               EDWARD M. LEONARD
               JUDITH M. O'BRIEN                                GARI L. CHEEVER
       WILSON, SONSINI, GOODRICH & ROSATI                 BROBECK, PHLEGER & HARRISON
            PROFESSIONAL CORPORATION                         TWO EMBARCADERO PLACE
               650 PAGE MILL ROAD                                2200 GENG ROAD
            PALO ALTO, CA 94304-1050                        PALO ALTO, CA 94303-0913
                 (415) 493-9300                                  (415) 424-0160
</TABLE>
 
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
                            ------------------------
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  / /
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  / /
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /
                            ------------------------
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<S>                            <C>                   <C>              <C>              <C>
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                                                                          PROPOSED
                                                         PROPOSED         MAXIMUM
     TITLE OF EACH CLASS              AMOUNT             MAXIMUM         AGGREGATE        AMOUNT OF
        OF SECURITIES                  TO BE          OFFERING PRICE      OFFERING       REGISTRATION
       TO BE REGISTERED            REGISTERED(1)       PER SHARE(2)       PRICE(2)           FEE
- -------------------------------------------------------------------------------------------------------
Common Stock, $.01 par
  value.......................   5,750,000 shares        $41.125        $236,468,750       $81,542
- -------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Includes 750,000 shares which the Underwriters have the option to purchase
    to cover over-allotments, if any. Also includes Preferred Share Purchase
    Rights associated with the Common Stock.
 
(2) Estimated solely for the purpose of computing the amount of the registration
    fee, based on the average of the high and low prices for the Common Stock as
    reported on the New York Stock Exchange on June 26, 1995, in accordance with
    Rule 457(c) promulgated under the Securities Act of 1933.
                            ------------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
                   SUBJECT TO COMPLETION, DATED JUNE 27, 1995
PROSPECTUS
 
                                5,000,000 SHARES
 
                                     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 June 26, 1995, the last reported sale price
of the Company's Common Stock on the NYSE was $40.375 per share. See "Price
Range of Common Stock."
                            ------------------------
 
       SEE  "RISK FACTORS" AT PAGE 4 FOR CERTAIN FACTORS RELEVENT 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.......................            $                     $                      $
- -----------------------------------------------------------------------------------------------------
Total(3)........................            $                     $                      $
- -----------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------
</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 $          , $          and
    $          , 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   , 1995.
                            ------------------------
 
LEHMAN BROTHERS
            MERRILL LYNCH & CO.
                         MONTGOMERY SECURITIES
                                    PRUDENTIAL SECURITIES INCORPORATED
July   , 1995
<PAGE>   3
 
                             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>   4
 
                               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>   5
 
                                  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>   6
 
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) will have been drawn
down by 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>   7
 
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>   8
 
                                  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>   9
 
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>   10
 
                                USE OF PROCEEDS
 
     The net proceeds from the sale of Common Stock offered hereby are estimated
to be $193,500,000 ($222,570,000 if the Underwriters' over-allotment option is
exercised in full) assuming a public offering price of $40.375 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        1 1/16
          Fourth Quarter............................................   22 11/16      1 7/16
        FISCAL 1995
          First Quarter.............................................   29 3/16      18 1/4
          Second Quarter (through June 26, 1995)....................   42 5/8       25 1/2
</TABLE>
 
     On June 26, 1995, the last reported sale price of the Common Stock on the
NYSE was $40.375 per share.
 
                                        9
<PAGE>   11
 
                                 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 assuming a public offering price of $40.375 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               758,887
  Retained earnings...........................................     112,329               112,329
  Cumulative translation adjustment...........................     112,487               112,487
                                                                ----------           -----------
     Total stockholders' equity...............................     790,860               984,360
                                                                ----------           -----------
          Total capitalization................................  $1,115,675           $ 1,309,175
                                                                 =========             =========
</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
will have been drawn down by June 30, 1995. This lease line will be used to
lease equipment for the Company's Japanese manufacturing facility.
 
                                       10
<PAGE>   12
 
                      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>   13
 
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>   14
 
                                  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. .............................................
        Merrill Lynch, Pierce, Fenner & Smith
                     Incorporated.........................................
        Montgomery Securities.............................................
        Prudential Securities Incorporated................................
                                                                            ---------
                  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 $     per share. The Underwriters may allow and the
selected dealers may reallow a concession not in excess of $     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>   15
 
                                 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>   16
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     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   , 1995
 
                          ---------------------------
                                LEHMAN BROTHERS
 
                              MERRILL LYNCH & CO.
 
                             MONTGOMERY SECURITIES
 
                       PRUDENTIAL SECURITIES INCORPORATED
 
- ------------------------------------------------------
- ------------------------------------------------------
<PAGE>   17
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the various costs and expenses payable by
the Company, other than underwriting discounts and commissions, of the sale and
distribution of the securities being registered. All of the amounts shown are
estimates except the Securities and Exchange Commission registration fee, the
NYSE listing fee and the NASD filing fee.
 
<TABLE>
        <S>                                                                 <C>
        SEC Registration Fee..............................................  $ 81,542
        NASD Filing Fee...................................................    24,147
        NYSE Listing Fee..................................................     1,500
        Blue Sky Fees and Expenses........................................    10,000
        Legal Fees and Expenses...........................................    80,000
        Accounting Fees and Expenses......................................    45,000
        Printing..........................................................    45,000
        Transfer Agent and Registrar Fees.................................     5,000
        Miscellaneous.....................................................     7,811
                                                                            --------
          Total...........................................................  $300,000
                                                                            ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     The Company has the power, pursuant to Section 145 of the Delaware General
Corporation Law, to limit the liability of directors to the Company for certain
breaches of fiduciary duty and to indemnify its directors, officers and other
persons for certain acts. Article 11 of the Company's Restated Certificate of
Incorporation includes the following provision:
 
          "To the fullest extent permitted by the Delaware General Corporation
     Law, a director of the Corporation shall not be personally liable to the
     Corporation or its stockholders for monetary damages for breach of
     fiduciary duty as a director. Neither any amendment nor repeal of this
     Article 11, nor the adoption of any provision of this Certificate of
     Incorporation inconsistent with this Article 11, shall eliminate or reduce
     the effect of this Article 11 in respect of any matter occurring, or any
     cause of action, suit or claim that, but for this Article 11, would accrue
     or arise, prior to such amendment, repeal or adoption of an inconsistent
     provision."
 
     Article VI of the Bylaws of the Company provides that the Company shall
indemnify certain agents of the Company against judgments, fines, settlements
and other expenses arising from such person's agency relationship with the
Company provided that the standard of conduct set forth therein is met. The
effect of Article VI is to require that the Company provide indemnification to
such agents to the maximum extent permitted by the Delaware General Corporation
Law. Agents covered by this indemnification provision include current and former
directors and officers of the Company, as well as persons who serve at the
request of the Company as directors, officers, employees or agents of another
enterprise.
 
     In addition, the Company has entered into indemnification agreements with
each of its directors and certain of its officers. The indemnification
agreements are based on the provisions of Section 145 of the Delaware General
Corporation Law and attempt to provide the directors and officers of the Company
with the maximum indemnification allowed under Delaware law. In certain
instances, they may result in an expansion of the substantive protection
available to such individuals under the Restated Certificate of Incorporation
and the Bylaws.
 
     The Company currently maintains directors' and officers' liability
insurance.
 
     Reference is also made to Section 8 of the Underwriting Agreement contained
in Exhibit 1.1 hereto, indemnifying officers and directors of the Registrant
against certain liabilities.
 
                                      II-1
<PAGE>   18
 
ITEM 16. EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
        NUMBER                                    DESCRIPTION
        ------     --------------------------------------------------------------------------
        <C>        <S>
          1.1      Form of Underwriting Agreement between Registrant and Lehman Brothers,
                   Merrill Lynch, Pierce, Fenner & Smith Incorporated, Montgomery Securities
                   and Prudential Securities Incorporated.
          4.1      Preferred Shares Rights Agreement dated November 16, 1988.(1)
          5.1      Opinion of Wilson, Sonsini, Goodrich & Rosati, Professional Corporation,
                   regarding legality of securities being registered.
         23.1      Consent of Price Waterhouse LLP (see page II-4).
         23.2      Consent of Counsel (included in Exhibit 5.1).
         24.1      Power of Attorney (see page II-3)
         27.1      Financial Data Schedule
</TABLE>
 
- ---------------
 
(1) Incorporated by reference to exhibits filed with the Registrant's Form 8-A
    filed on November 21, 1988.
 
ITEM 17. UNDERTAKINGS
 
     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act that is incorporated by reference in the Registration Statement
shall be deemed to be a new Registration Statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to provisions of the Company's Certificate of Incorporation
and Bylaws, Delaware Corporation Law, the Underwriting Agreement or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Securities Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered hereunder, the Registrant
will, unless in the opinion of its counsel the question has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question of whether such indemnification by it is against public policy as
expressed in the Securities Act and will be governed by the final adjudication
of such issue.
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of Prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of Prospectus shall
     be deemed to be a new Registration Statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-2
<PAGE>   19
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant, LSI Logic Corporation, a corporation organized and existing under
the law of the State of Delaware, certifies that it has reasonable grounds to
believe that it meets all of the requirements for filing on Form S-3 and has
duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Milpitas, State of
California, on the 26th day of June, 1995.
 
                                          LSI Logic Corporation
 
                                          By:         WILFRED J. CORRIGAN
 
                                            ------------------------------------
                                                    Wilfred J. Corrigan,
                                            Chairman and Chief Executive Officer
 
                               POWER OF ATTORNEY
 
     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Wilfred J. Corrigan and David E. Sanders,
jointly and severally, his attorneys-in-fact, each with power of substitution,
for him in any and all capacities, to sign any amendments to this Registration
Statement (including post-effective amendments), and to file the same, with
exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, hereby ratifying and confirming all that
each of said attorneys-in-fact, or his substitute or substitutes, may do or
cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated:
 
<TABLE>
<CAPTION>
              SIGNATURE                                  TITLE                         DATE
- -------------------------------------   ---------------------------------------   ---------------
 
<S>                                     <C>                                       <C>
         WILFRED J. CORRIGAN             Chairman and Chief Executive Officer     June 26, 1995
- -------------------------------------        (Principal Executive Officer)
         Wilfred J. Corrigan

         ALBERT A. PIMENTEL               Senior Vice President, Finance and      June 26, 1995
- -------------------------------------     Chief Financial Officer (Principal
         Albert A. Pimentel                 Financial Officer and Principal
                                                  Accounting Officer)
 
              T.Z. CHU                                Director                    June 26, 1995
- -------------------------------------
              T.Z. Chu
 
          MALCOLM R. CURRIE                           Director                    June 26, 1995
- -------------------------------------
          Malcolm R. Currie
 
           JAMES H. KEYES                             Director                    June 26, 1995
- -------------------------------------
           James H. Keyes
 
          R. DOUGLAS NORBY                            Director                    June 26, 1995
- -------------------------------------
          R. Douglas Norby
</TABLE>
 
                                      II-3
<PAGE>   20
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
January 26, 1995 appearing on page 21 of LSI Logic Corporation's Annual Report
on Form 10-K for the year ended December 31, 1994. We also consent to the
references to us under the headings "Experts" and "Selected Financial Data" in
such Prospectus. However, it should be noted that Price Waterhouse LLP has not
prepared or certified such "Selected Financial Data."
 
PRICE WATERHOUSE LLP
 
San Jose, California
June 26, 1995
 
                                      II-4
<PAGE>   21
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                     EXHIBITS
- -------
<C>         <S>                                                                    <C>
   1.1      Form of Underwriting Agreement between Registrant and Lehman Brothers,
            Merrill Lynch, Pierce, Fenner & Smith Incorporated, Montgomery
            Securities and Prudential Securities Incorporated
   4.1      Preferred Shares Rights Agreement dated November 16, 1988.(1)
   5.1      Opinion of Wilson, Sonsini, Goodrich & Rosati, Professional
            Corporation, regarding legality of securities being registered
  23.1      Consent of Price Waterhouse LLP (see page II-4)
  23.2      Consent of Counsel (included in Exhibit 5.1)
  24.1      Power of Attorney (see page II-3)
  
</TABLE>
 
- ---------------
 
(1) Incorporated by reference to exhibits filed with the Registrant's Form 8-A
    filed on November 21, 1988.

<PAGE>   1
 
                                                                   Draft 6/26/95
 
                                                     5,000,000 SHARES
 
                                                  LSI LOGIC CORPORATION
 
                                                       COMMON STOCK
 
                                                  UNDERWRITING AGREEMENT
 
                                                                   July   , 1995
 
                                          LEHMAN BROTHERS INC.
                                          MERRILL LYNCH, PIERCE, FENNER & SMITH
                                                   INCORPORATED
                                          MONTGOMERY SECURITIES
                                          PRUDENTIAL SECURITIES INCORPORATED
                                            c/o Lehman Brothers Inc.
                                            Three World Financial Center
                                            New York, New York 10285
 
                                          Dear Sirs:
 
     LSI Logic Corporation, a Delaware corporation (the "Company"), proposes to
sell 5,000,000 shares (the "Firm Stock") of the Company's common stock, par
value $0.01 per share (the "Common Stock"). In addition, the Company proposes to
grant to the Underwriters named in Schedule 1 hereto (the "Underwriters") an
option to purchase up to an additional 750,000 shares of the Common Stock on the
terms and for the purposes set forth in Section 2 (the "Option Stock"). The Firm
Stock and the Option Stock, if purchased, are hereinafter collectively called
the "Stock." This is to confirm the agreement concerning the purchase of the
Stock from the Company by the Underwriters.
 
     1.  Representations, Warranties and Agreements of the Company.  The Company
represents, warrants and agrees that:
 
          (a) A registration statement on Form S-3 with respect to the Stock has
     (i) been prepared by the Company in conformity with the requirements of the
     United States Securities Act of 1933, as amended, (the "Securities Act")
     and the rules and regulations (the "Rules and Regulations") promulgated by
     the United States Securities and Exchange Commission (the "Commission")
     thereunder, (ii) been filed with the Commission under the Securities Act
     and (iii) become effective under the Securities Act. Copies of such
     registration statement and all amendments thereto have been delivered by
     the Company to you. As used in this Agreement, "Effective Time" means the
     date and the time as of which such registration statement, or the most
     recent post-effective amendment thereto, if any, was declared effective by
     the Commission; "Effective Date" means the date of the Effective Time;
     "Preliminary Prospectus" means each prospectus included in such
     registration statement, or amendments thereof, before it became effective
     under the Securities Act and any prospectus filed with the Commission by
     the Company with the consent of the Representatives pursuant to Rule 424(a)
     of the Rules and Regulations; "Registration Statement" means such
     registration statement, as amended at the Effective Time, including any
     documents incorporated by reference therein at such time and all
     information contained in the final prospectus filed with the Commission
     pursuant to Rule 424(b) of the Rules and Regulations in accordance with
     Section 5(a) hereof and deemed to be a part of the registration statement
     as of the Effective Time pursuant to paragraph (b) of Rule 430A of the
     Rules and Regulations; and "Prospectus" means such final prospectus, as
     first filed with the Commission pursuant to paragraph (1) or (4) of Rule
     424(b) of the Rules and Regulations. Reference made herein to any
     Preliminary Prospectus or to the
<PAGE>   2
 
     Prospectus shall be deemed to refer to and include any documents
     incorporated by reference therein pursuant to Item 12 of Form S-3 under the
     Securities Act, as of the date of such Preliminary Prospectus or the
     Prospectus, as the case may be, and any reference to any amendment or
     supplement to any Preliminary Prospectus or the Prospectus shall be deemed
     to refer to and include any document filed under the United States
     Securities Exchange Act of 1934 (the "Exchange Act") after the date of such
     Preliminary Prospectus or the Prospectus, as the case may be, and
     incorporated by reference in such Preliminary Prospectus or the Prospectus,
     as the case may be. The Commission has not issued any order preventing or
     suspending the use of any Preliminary Prospectus.
 
          (b) The Registration Statement conforms, and the Prospectus and any
     further amendments or supplements to the Registration Statement or the
     Prospectus will, when they become effective or are filed with the
     Commission, as the case may be, conform in all material respects to the
     requirements of the Securities Act and the Rules and Regulations and do not
     and will not, as of the applicable effective date (as to the Registration
     Statement and any amendment thereto) and as of the applicable filing date
     (as to the Prospectus and any amendment or supplement thereto) contain an
     untrue statement of a material fact or omit to state a material fact
     required to be stated therein or necessary to make the statements therein,
     in light of the circumstances under which they were made, not misleading;
     provided that no representation or warranty is made as to information
     contained in or omitted from the Registration Statement or the Prospectus
     in reliance upon and in conformity with written information furnished to
     the Company by or on behalf of any Underwriter specifically for inclusion
     therein.
 
          (c) The documents incorporated by reference in the Prospectus, when
     they became effective or were filed with the Commission, as the case may
     be, conformed in all material respects to the requirements of the
     Securities Act or the Exchange Act, as applicable, and the rules and
     regulations of the Commission thereunder, and none of such documents
     contained an untrue statement of a material fact or omitted to state a
     material fact required to be stated therein or necessary to make the
     statements therein not misleading in light of the circumstances under which
     they were made; and any further documents so filed and incorporated by
     reference in the Prospectus, when such documents become effective or are
     filed with the Commission, as the case may be, will conform in all material
     respects to the requirements of the Securities Act or the Exchange Act, as
     applicable, and the rules and regulations of the Commission thereunder and
     will not contain an untrue statement of a material fact or omit to state a
     material fact required to be stated therein or necessary to make the
     statements therein not misleading in light of the circumstances under which
     they were made.
 
          (d) The Company and each of its Significant Subsidiaries (as defined
     in Section 15) have been duly incorporated and are validly existing as
     corporations in good standing under the laws of their respective
     jurisdictions of incorporation, are duly qualified to do business and are
     in good standing as foreign corporations in each jurisdiction in which
     their respective ownership or lease of property or the conduct of their
     respective businesses requires such qualification except to the extent that
     the failure to be so qualified or be in good standing would not have a
     material adverse effect on the Company and its subsidiaries taken as a
     whole, and have all corporate power and authority necessary to own or hold
     their respective properties and to conduct the businesses in which they are
     engaged.
 
          (e) The Company has an authorized capitalization as set forth in
     documents incorporated by reference in the Prospectus, and all of the
     issued shares of capital stock of the Company have been duly and validly
     authorized and issued, are fully paid and non-assessable and conform to the
     description thereof contained in the Prospectus; and all of the issued and
     outstanding shares of capital stock of each Significant Subsidiary of the
     Company have been duly and validly authorized and issued and are fully paid
     and non-assessable and are owned directly or indirectly by the Company in
     the percentages set forth on Schedule 1(e) hereof, free and clear of all
     liens, encumbrances, equities or claims.
 
          (f) The unissued shares of the Stock to be issued and sold by the
     Company to the Underwriters hereunder have been duly and validly authorized
     and, when issued and delivered against payment therefor as provided herein,
     will be duly and validly issued, fully paid and non-assessable; and the
     Stock will conform to the description thereof contained in documents
     incorporated by reference into the Prospectus.
 
                                        2
<PAGE>   3
 
          (g) This Agreement has been duly authorized, executed and delivered by
     the Company and constitutes a valid and binding agreement of the Company
     enforceable against the Company in accordance with its terms, except as (i)
     the enforceability thereof may be limited by the effects of bankruptcy,
     insolvency, fraudulent conveyance, reorganization, moratorium and other
     similar laws relating to or affecting creditors' rights generally, and (ii)
     the availability of equitable remedies may be limited by equitable
     principles of general applicability.
 
          (h) The execution, delivery and performance of this Agreement by the
     Company and the consummation of the transactions contemplated hereby will
     not conflict with or result in a breach or violation of any of the terms or
     provisions of, or constitute a default under, any material indenture,
     mortgage, deed of trust, loan agreement or other agreement or instrument to
     which the Company or any of its Significant Subsidiaries is a party or by
     which the Company or any of its Significant Subsidiaries is bound or to
     which any of the properties or assets of the Company or any of its
     Significant Subsidiaries is subject, nor will such actions result in any
     violation of the provisions of the charter or bylaws of the Company or any
     of its Significant Subsidiaries or any statute or any order, rule or
     regulation of any court or governmental agency or body having jurisdiction
     over the Company or any of its Significant Subsidiaries or any of their
     properties or assets; and, except for the registration of the Stock under
     the Securities Act, and such consents, approvals, authorizations,
     registrations or qualifications as may be required under the Exchange Act
     and applicable state securities laws in connection with the purchase and
     distribution of the Stock by the Underwriters, no consent, approval,
     authorization or order of, or filing or registration with, any such court
     or governmental agency or body is required for the execution, delivery and
     performance of this Agreement by the Company and the consummation of the
     transactions contemplated hereby.
 
          (i) There are no contracts, agreements or understandings, which have
     not been waived in connection with this transaction, between the Company
     and any person granting such person the right to require the Company to
     file a registration statement under the Securities Act with respect to any
     securities of the Company owned or to be owned by such person or to require
     the Company to include such securities in the securities registered
     pursuant to the Registration Statement or in any securities being
     registered pursuant to any other registration statement filed by the
     Company under the Securities Act.
 
          (j) Except as described in the Prospectus or documents incorporated
     therein by reference, the Company has not sold or issued any shares of
     Common Stock during the six-month period preceding the date of the
     Prospectus, including any sales pursuant to Rule 144A under, or Regulations
     D or S of, the Securities Act, other than shares issued pursuant to
     employee benefit plans, stock options plans or other employee compensation
     plans or pursuant to outstanding options, rights or warrants.
 
          (k) Neither the Company nor any of its Significant Subsidiaries has
     sustained, since the date of the latest audited consolidated financial
     statements included or incorporated by reference in the Prospectus, any
     material loss or interference with its business from fire, explosion, flood
     or other calamity, whether or not covered by insurance, or from any labor
     dispute or court or governmental action, order or decree, otherwise than as
     set forth or contemplated in the Prospectus; and, since such date, there
     has not been any change in the capital stock, other than the reservation of
     the Stock and issuance of options and stock under employee benefit plans,
     or in long-term debt of the Company or any of its Significant Subsidiaries
     or any material adverse change, or any development involving a prospective
     material adverse change, in or affecting the general affairs, management,
     financial position, stockholders' equity or results of operations of the
     Company and its subsidiaries, otherwise than as set forth or contemplated
     in the Prospectus or the documents incorporated by reference therein.
 
          (l) The consolidated financial statements (including the related notes
     and supporting schedules) filed as part of the Registration Statement or
     included or incorporated by reference in the Prospectus present fairly the
     financial condition and results of operations of the entities purported to
     be shown thereby, at the dates and for the periods indicated, and have been
     prepared in conformity with generally accepted accounting principles
     applied on a consistent basis throughout the periods involved.
 
                                        3
<PAGE>   4
 
          (m) Except as described in the Prospectus or the documents
     incorporated by reference therein, and except as would not result in any
     material adverse effect upon the business of the Company and its
     subsidiaries taken as a whole, the Company and each of its Significant
     Subsidiaries own or possess adequate rights to use all material patents,
     patent applications, trademarks, service marks, trade names, trademark
     registrations, service mark registrations, copyrights and licenses
     necessary for the conduct of their respective businesses as now conducted
     or as proposed to be conducted as described in the Prospectus or the
     documents incorporated by reference therein, and have no reason to believe
     that the conduct of their respective businesses as now conducted or as
     proposed to be conducted as described in the Prospectus or the documents
     incorporated by reference therein, will conflict with, and have not
     received any notice of any claim of conflict with, any such rights of
     others, except as the outcome of such claim of conflict would not result in
     any material adverse effect upon the Company and its subsidiaries taken as
     a whole.
 
          (n) The conditions for use of Form S-3, as set forth in the General
     Instructions thereto, have been satisfied.
 
          (o) There are no contracts or other documents which are required to be
     described in the Prospectus or filed as exhibits to the Registration
     Statement by the Securities Act or by the Rules and Regulations which have
     not been described in the Prospectus or filed as exhibits to the
     Registration Statement or incorporated therein by reference as permitted by
     the Rules and Regulations.
 
          (p) The Company has filed all federal, state and local income and
     franchise tax returns required to be filed through the date hereof and has
     paid all taxes shown thereon, as due and no tax deficiency has been
     determined adversely to the Company or any of its subsidiaries which has
     had (nor does the Company have any knowledge of any tax deficiency which,
     if determined adversely to the Company or any of its subsidiaries, will
     have a material adverse effect on the consolidated financial position,
     stockholders' equity, results of operations, business or prospects of the
     Company and its subsidiaries, taken as a whole.
 
          (q) Since the date as of which information is given in the Prospectus
     through the date hereof, and except as may otherwise be disclosed in the
     Prospectus or documents incorporated by reference herein, the Company has
     not (i) issued or granted any securities except options and shares of
     common stock issued on exercise of options and stock purchase rights
     granted under the Company's stock option and benefit plans, (ii) incurred
     any liability or obligation, direct or contingent, other than liabilities
     and obligations which were incurred in the ordinary course of business,
     (iii) entered into any transaction not in the ordinary course of business
     or (iv) declared or paid any dividend on its capital stock.
 
          (s) The Company's directors and executive officers, who collectively
     held as of December 31, 1994 an aggregate of 3,882,030 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 the Prospectus.
 
     2.  Purchase of the Stock by the Underwriters.  On the basis of the
representations and warranties contained in, and subject to the terms and
conditions of, this Agreement, the Company agrees to sell 5,000,000 shares of
the Firm Stock to the several Underwriters and each of the Underwriters,
severally and not jointly, agrees to purchase the number of shares of the Firm
Stock set opposite that Underwriter's name in Schedule 1 hereto.
 
     In addition, the Company grants to the Underwriters an option to purchase
up to 750,000 shares of Option Stock. Such option is granted solely for the
purpose of covering overallotments in the sale of Firm Stock and is exercisable
as provided in Section 4 hereof. Shares of Option Stock shall be purchased
severally for the account of the Underwriters in proportion to the number of
shares of Firm Stock set opposite the name of such Underwriters in Schedule 1
hereto. The respective purchase obligations of each Underwriter with respect to
the Option Stock shall be adjusted by the Underwriters so that no Underwriter
shall be obligated to
 
                                        4
<PAGE>   5
 
purchase Option Stock other than in 100 share amounts. The price of both the
Firm Stock and any Option Stock shall be $       per share.
 
     The Company shall not be obligated to deliver any of the Stock to be
delivered on the First Delivery Date or the Second Delivery Date (as hereinafter
defined), as the case may be, except upon payment for all the Stock to be
purchased on such Delivery Date as provided herein.
 
     3.  Offering of Stock by the Underwriters.  The several Underwriters
propose to offer the Firm Stock for sale upon the terms and conditions set forth
in the Prospectus.
 
     4.  Delivery of and Payment for the Stock.  Delivery of and payment for the
Firm Stock shall be made at the office of Wilson, Sonsini, Goodrich & Rosati,
650 Page Mill Road, Palo Alto, California 94304, at 10:00 A.M., New York City
time, on the third full business day following the date of this Agreement, or
the fourth full business day if permitted under Rule 15c6-1(c) of the Exchange
Act, or at such other date or place as shall be determined by agreement between
the Underwriters and the Company. This date and time are sometimes referred to
as the First Delivery Date." On the First Delivery Date, the Company shall
deliver or cause to be delivered certificates representing the Firm Stock to the
Underwriters against payment to or upon the order of the Company of the purchase
price by certified or official bank check or checks payable in New York Clearing
House (next-day) funds. Time shall be of the essence, and delivery at the time
and place specified pursuant to this Agreement is a further condition of the
obligation of each Underwriter hereunder. Upon delivery, the Firm Stock shall be
registered in such names and in such denominations as the Underwriters shall
request in writing not less than two full business days prior to the First
Delivery Date. For the purpose of expediting the checking and packaging of the
certificates for the Firm Stock, the Company shall make the certificates
representing the Firm Stock available for inspection by the Underwriters in New
York, New York, not later than 2:00 P.M., New York City time, on the business
day prior to the First Delivery Date.
 
     At any time on or before the thirtieth day after the date of this Agreement
the option granted in Section 2 may be exercised by written notice being given
to the Company by the Underwriters. Such notice shall set forth the aggregate
number of shares of Option Stock as to which the option is being exercised, the
names in which the shares of Option Stock are to be registered, the
denominations in which the shares of Option Stock are to be issued and the date
and time, as determined by the Underwriters, when the shares of Option Stock are
to be delivered; provided, however, that this date and time shall not be earlier
than the First Delivery Date nor earlier than the second business day after the
date on which the option shall have been exercised nor later than the third
business day after the date on which the option shall have been exercised (the
fourth full business day if permitted under Rule 15c6-1(c) of the Exchange Act).
The date and time the shares of Option Stock are delivered are sometimes
referred to as the "Second Delivery Date" and the First Delivery Date and the
Second Delivery Date are sometimes each referred to as a "Delivery Date").
 
     Delivery of and payment for the Option Stock shall be made at the place
specified in the first sentence of the first paragraph of this Section 4 (or at
such other place as shall be determined by agreement between the Representatives
and the Company) at 10:00 A.M., New York City time, on the Second Delivery Date.
On the Second Delivery Date, the Company shall deliver or cause to be delivered
the certificates representing the Option Stock to the Underwriters against
payment to or upon the order of the Company of the purchase price by certified
or official bank check or checks payable in New York Clearing House (next-day)
funds. Time shall be of the essence, and delivery at the time and place
specified pursuant to this Agreement is a further condition of the obligation of
each Underwriter hereunder. Upon delivery, the Option Stock shall be registered
in such names and in such denominations as the Underwriters shall request in the
aforesaid written notice. For the purpose of expediting the checking and
packaging of the certificates for the Option Stock, the Company shall make the
certificates representing the Option Stock available for inspection by the
Underwriters in New York, New York, not later than 2:00 P.M., New York City
time, on the business day prior to the Second Delivery Date.
 
                                        5
<PAGE>   6
 
     5.  Further Agreements of the Company.  The Company agrees:
 
          (a) To prepare the Prospectus in a form approved by the Underwriters
     and to file such Prospectus pursuant to Rule 424(b) under the Securities
     Act not later than Commission's close of business on the second business
     day following the execution and delivery of this Agreement or, if
     applicable, such earlier time as may be required by Rule 430A(a)(3) under
     the Securities Act; to make no further amendment or any supplement to the
     Registration Statement or to the Prospectus prior to the last Delivery Date
     except as permitted herein; to advise the Underwriters, promptly after it
     receives notice thereof, of the time when any amendment to the Registration
     Statement has been filed or becomes effective or any supplement to the
     Prospectus or any amended Prospectus has been filed and to furnish the
     Underwriters with copies thereof; to file promptly all reports and any
     definitive proxy or information statements required to be filed by the
     Company with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d)
     of the Exchange Act subsequent to the date of the Prospectus and for so
     long as the delivery of a prospectus is required in connection with the
     offering or sale of the Stock; to advise the Underwriters, promptly after
     it receives notice thereof, of the issuance by the Commission of any stop
     order or of any order preventing or suspending the use of any Preliminary
     Prospectus or the Prospectus, of the suspension of the qualification of the
     Stock for offering or sale in any jurisdiction, of the initiation or
     threatening of any proceeding for any such purpose, or of any request by
     the Commission for the amending or supplementing of the Registration
     Statement or the Prospectus or for additional information; and, in the
     event of the issuance of any stop order or of any order preventing or
     suspending the use of any Preliminary Prospectus or the Prospectus or
     suspending any such qualification, to use promptly its best efforts to
     obtain its withdrawal;
 
          (b) To furnish promptly to the Underwriters and to counsel for the
     Underwriters a signed copy of the Registration Statement as originally
     filed with the Commission, and each amendment thereto filed with the
     Commission, including all consents and exhibits filed therewith;
 
          (c) To deliver promptly to the Underwriters such number of the
     following documents as the Underwriters shall reasonably request: (i)
     conformed copies of the Registration Statement as originally filed with the
     Commission and each amendment thereto (in each case excluding exhibits
     other than this Agreement and the computation of per share earnings), (ii)
     each Preliminary Prospectus, the Prospectus and any amended or supplemented
     Prospectus and (iii) any document incorporated by reference in the
     Prospectus (excluding exhibits thereto); and, if the delivery of a
     prospectus is required at any time after the Effective Time in connection
     with the offering or sale of the Stock or any other securities relating
     thereto and if at such time any events shall have occurred as a result of
     which the Prospectus as then amended or supplemented would include an
     untrue statement of a material fact or omit to state any material fact
     necessary in order to make the statements therein, in the light of the
     circumstances under which they were made when such Prospectus is delivered,
     not misleading, or, if for any other reason it shall be necessary to amend
     or supplement the Prospectus or to file under the Exchange Act any document
     incorporated by reference in the Prospectus in order to comply with the
     Securities Act or the Exchange Act, to notify the Underwriters and to file
     such document and to prepare and furnish without charge to each Underwriter
     and to any dealer in securities as many copies as the Underwriters may from
     time to time reasonably request of an amended or supplemented Prospectus
     which will correct such statement or omission or effect such compliance.
 
          (d) To file promptly with the Commission any amendment to the
     Registration Statement or the Prospectus or any supplement to the
     Prospectus that may, in the judgment of the Company or the Underwriters, be
     required by the Securities Act or requested by the Commission;
 
          (e) Prior to filing with the Commission any amendment to the
     Registration Statement or supplement to the Prospectus, any document
     incorporated by reference in the Prospectus or any Prospectus pursuant to
     Rule 424 of the Rules and Regulations, to furnish a copy thereof to the
     Underwriters and counsel for the Underwriters and obtain the consent of the
     Underwriters to the filing;
 
          (f) As soon as practicable after the Effective Date to make generally
     available to the Company's security holders and to deliver to the
     Underwriters an earnings statement of the Company and its
 
                                        6
<PAGE>   7
 
     subsidiaries (which need not be audited) complying with Section 11(a) of
     the Securities Act and the Rules and Regulations (including, at the option
     of the Company, Rule 158);
 
          (g) For a period of five years following the Effective Date, to
     furnish to the Underwriters copies of all materials furnished by the
     Company to its stockholders and all public reports and all reports and
     financial statements furnished by the Company to the principal national
     securities exchange upon which the Common Stock may be listed pursuant to
     requirements of or agreements with such exchange or to the Commission
     pursuant to the Exchange Act or any rule or regulation of the Commission
     thereunder;
 
          (h) Promptly from time to time to take such action as the Underwriters
     may reasonably request to qualify the Stock for offering and sale under the
     securities laws of such jurisdictions as the Underwriters may request and
     to comply with such laws so as to permit the continuance of sales and
     dealings therein in such jurisdictions for as long as may be necessary to
     complete the distribution of the Stock except where such qualification
     would require the Company to execute a general consent to service of
     process;
 
          (i) For a period of 90 days from the date of the Prospectus, not to
     offer for sale, sell or otherwise dispose of (or enter into any transaction
     which is designed to, or could be expected to, result in the disposition by
     any person of), directly or indirectly, any shares of common stock or
     preferred stock or any securities convertible into or exercisable or
     exchangeable for its common stock or preferred stock (including, but not
     limited to rights, options, and warrants) other than the Stock, shares and
     options issued pursuant to employee benefit plans, stock option plans or
     other employee compensation plans existing on the date hereof, and shares
     of Preferred Stock issued pursuant to the Rights (as defined in the
     Prospectus) without the prior written consent of the Underwriters;
 
          (j) Prior to the Effective Date, to apply for the listing of the Stock
     on the New York Stock Exchange, Inc. and to use its best efforts to
     complete that listing, subject only to official notice of issuance prior to
     the First Delivery Date; and
 
          (k) To apply the net proceeds from the sale of the Stock being sold by
     the Company as set forth in the Prospectus.
 
     6.  Expenses.  The Company agrees to pay (a) the costs incident to the
authorization, issuance, sale and delivery of the Stock and any taxes payable in
that connection; (b) the costs incident to the preparation, printing and filing
under the Securities Act of the Registration Statement and any amendments and
exhibits thereto; (c) the costs of distributing the Registration Statement as
originally filed and each amendment thereto and any post-effective amendments
thereof (including, in each case, exhibits), any Preliminary Prospectus, the
Prospectus and any amendment or supplement to the Prospectus or any document
incorporated by reference therein, all as provided in this Agreement; (d) the
costs of producing and distributing this Agreement and any other related
documents in connection with the offering, purchase, sale and delivery of the
stock; (e) the filing fees incident to securing any required review by the
National Association of Securities Dealers, Inc. of the terms of sale of the
Stock; (f) any applicable listing or other fees; (g) the fees and expenses of
qualifying the Stock under the securities laws of the several jurisdictions as
provided in Section 5(h) and of preparing, printing and distributing a Blue Sky
Memorandum (including related fees and expenses of counsel to the Underwriters);
and (h) all other costs and expenses incident to the performance of the
obligations of the Company under this Agreement; provided that, except as
provided in this Section 6 and in Section 11 the Underwriters shall pay their
own costs and expenses, including the costs and expenses of their counsel, any
transfer taxes on the Stock which they may sell and the expenses of advertising
any offering of the Stock made by the Underwriters.
 
     7.  Conditions of Underwriters' Obligations.  The respective obligations of
the Underwriters hereunder are subject to the accuracy, when made and on each
Delivery Date, of the representations and warranties of the Company contained
herein, to the performance by the Company of its obligations hereunder, and to
each of the following additional terms and conditions:
 
          (a) The Prospectus shall have been timely filed with the Commission in
     accordance with Section 5(a); no stop order suspending the effectiveness of
     the Registration Statement or any part thereof shall have been issued and
     no proceeding for that purpose shall have been initiated or threatened by
     the
 
                                        7
<PAGE>   8
 
     Commission; and any request of the Commission for inclusion of additional
     information in the Registration Statement or the Prospectus or otherwise
     shall have been complied with.
 
          (b) No Underwriter shall have discovered and disclosed to the Company
     on or prior to such Delivery Date that the Registration Statement or the
     Prospectus or any amendment or supplement thereto contains an untrue
     statement of a fact which, in the opinion of the Underwriters is material
     or omits to state a fact which is material and is required to be stated
     therein or is necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading.
 
          (c) All corporate proceedings and other legal matters incident to the
     authorization, form and validity of this Agreement, the Stock, the
     Registration Statement and the Prospectus, and all other legal matters
     relating to this Agreement and the transactions contemplated hereby shall
     be satisfactory in all respects to counsel for the Underwriters, and the
     Company shall have furnished to such counsel all documents and information
     that they may reasonably request to enable them to pass upon such matters.
 
          (d) Wilson, Sonsini, Goodrich & Rosati shall have furnished to the
     Underwriters its written opinion, as counsel to the Company, addressed to
     the Underwriters and dated such Delivery Date, in form and substance
     reasonably satisfactory to the Underwriters, to the effect that:
 
             (i) The Company has been duly incorporated and is a validly
        existing corporation in good standing under the laws of its jurisdiction
        of incorporation and has all power and authority necessary to own or
        hold its properties and to conduct the business in which it is engaged;
 
             (ii) The Company has an authorized capitalization as set forth in
        the documents incorporated by reference into the Prospectus, and during
        the course of the due diligence investigation conducted by such counsel,
        nothing came to such counsel's attention which caused such counsel to
        believe that the issued shares of capital stock of the Company had not
        been duly and validly authorized and issued, or were not fully paid and
        nonassessable;
 
             (iii) There are no preemptive or other rights to subscribe for or
        to purchase, nor any restriction upon the voting or transfer of, any
        shares of the Stock pursuant to the Company's charter or by-laws or any
        agreement or other instrument listed as an exhibit to the Registration
        Statement or as an exhibit to any document incorporated by reference in
        the Prospectus;
 
             (iv) The Registration Statement was declared effective under the
        Securities Act as of the date and time specified in such opinion, the
        Prospectus was filed with the Commission pursuant to the subparagraph of
        Rule 424(b) of the Rules and Regulations specified in such opinion on
        the date specified therein and no stop order suspending the
        effectiveness of the Registration Statement has been issued and, to the
        knowledge of such counsel, no proceeding for that purpose is pending or
        threatened by the Commission;
 
             (v) The Registration Statement and the Prospectus and any further
        amendments or supplements thereto made by the Company prior to such
        Delivery Date (other than the financial statements and related schedules
        therein, as to which such counsel need express no opinion) comply as to
        form in all material respects with the requirements of the Securities
        Act and the Rules and Regulations; and the documents incorporated by
        reference in the Prospectus and any further amendment or supplement to
        any such incorporated document made by the Company prior to such
        Delivery Date (other than the financial statements, schedules and other
        financial statistical data, as to which such counsel need express no
        opinion), when they became effective or were filed with the Commission,
        as the case may be, complied as to form in all material respects with
        the requirements of the Securities Act or the Exchange Act, as
        applicable, and the rules and regulations of the Commission thereunder;
 
             (vi) To the best of such counsel's knowledge, there are no
        contracts or other documents which are required to be described in the
        Prospectus or filed as exhibits to the Registration Statement by the
        Securities Act or by the Rules and Regulations which have not been
        described or filed as exhibits
 
                                        8
<PAGE>   9
 
        to the Registration Statement or incorporated therein by reference as
        permitted by the Rules and Regulations;
 
             (vii) This Agreement has been duly authorized, executed and
        delivered by the Company; and
 
             (viii) The issue and sale of the shares of Stock being delivered on
        such Delivery Date by the Company and the compliance by the Company with
        all of the provisions of this Agreement and the consummation of the
        transactions contemplated hereby will not conflict with or result in a
        breach or violation of any of the terms or provisions of the charter or
        by-laws of the Company or any statute or any order, rule or regulation
        known to such counsel of any court or governmental agency or body having
        jurisdiction over the Company or any of their properties or assets; and,
        except for the registration of the Stock under the Securities Act and
        such consents, approvals, authorizations, registrations or
        qualifications as may be required under the Exchange Act and applicable
        state securities laws in connection with the purchase and distribution
        of the Stock by the Underwriters, no consent, approval, authorization or
        order of, or filing or registration with, any such court or governmental
        agency or body is required for the execution, delivery and performance
        of this Agreement by the Company and the consummation of the
        transactions contemplated hereby.
 
          In rendering such opinion, such counsel may state that its opinion is
     limited to matters governed by the Federal laws of the United States of
     America and the laws of the State of California and the General Corporation
     Law of Delaware. Such counsel shall also have furnished to the Underwriters
     a written statement, addressed to the Underwriters and dated such Delivery
     Date, in form and substance satisfactory to the Underwriters, to the effect
     that (x) such counsel has participated in conferences with the Underwriters
     and representatives of the Company and its auditors in connection with the
     preparation of the Registration Statement, and (y) based on the foregoing,
     no facts have come to the attention of such counsel which lead it to
     believe that (except for financial statements, schedules, and other
     statistical data as to which counsel need not express any opinion) (I) the
     Registration Statement, as of the Effective Date, contained any untrue
     statement of a material fact or omitted to state a material fact required
     to be stated therein or necessary in order to make the statements therein
     not misleading in light of the circumstances under which they were made, or
     that the Prospectus contains any untrue statement of a material fact or
     omits to state a material fact required to be stated therein or necessary
     in order to make the statements therein, in light of the circumstances
     under which they were made, not misleading (II) any document incorporated
     by reference in the Prospectus or any further amendment or supplement to
     any such incorporated document made by the Company prior to such Delivery
     Date, when they became effective or were filed with the Commission as the
     case may be, contained, in the case of a registration statement which
     became effective under the Securities Act, any untrue statement of a
     material fact or omitted to state a material fact required to be stated
     therein or necessary in order to make the statements therein in light of
     the circumstances under which they were made not misleading, or, in the
     case of other documents which were filed under the Exchange Act with the
     Commission, an untrue statement of a material fact or omitted to state a
     material fact necessary in order to make the statements therein, in light
     of the circumstances under which they were made, not misleading. The
     foregoing opinion and statement may be qualified by a statement to the
     effect that such counsel does not assume any responsibility for the
     accuracy, completeness or fairness of the statements contained in the
     Registration Statement or the Prospectus.
 
          (e) Counsel to each of LSI Logic Europe plc, LSI Logic K.K., Nihon
     Semiconductor, Inc., LSI Logic Corporation of Canada, Inc., LSI Logic GmbH
     and LSI Logic S.A., shall have furnished to the Underwriters an opinion as
     counsel to such subsidiary, addressed to the Underwriters and dated such
     Delivery Date, in form and substance reasonably satisfactory to the
     Underwriters, to the effect that, with respect to each such subsidiary:
 
             (i) Such subsidiary is duly incorporated (as applicable) and
        validly existing as a corporation in good standing under the laws of the
        jurisdiction in which it is chartered or organized with full corporate
        power and authority to own its properties and conduct its business as
        presently conducted, and is duly qualified to do business and is in good
        standing in each jurisdiction in which the character
 
                                        9
<PAGE>   10
 
        of the business conducted by it or the location of the properties owned
        or leased by it makes such qualification necessary, except where the
        failure to be so qualified would not have a material adverse effect on
        the Company and its subsidiaries taken as a whole;
 
             (ii) All outstanding shares of capital stock of such subsidiary
        have been duly authorized and issued and are fully paid and
        nonassessable. As of this date,        shares of capital stock of such
        subsidiary were issued and outstanding,           of which were issued
        to and owned by the Company. To the knowledge of such counsel, the
        shares of capital stock issued to the Company are owned free and clear
        of any security interest, claim, lien or encumbrance created by any
                  statute, law or governmental regulation or authority;
 
          It is recognized and understood that the foregoing local opinion
     requirements will be modified as necessary or appropriate to adapt the
     legal concepts set forth therein to the comparable concepts as existing
     under the jurisprudence of the applicable jurisdiction and to conform to
     generally accepted local legal practices.
 
          (f) David E. Sanders shall have furnished to the Underwriters a
     written opinion, as general counsel to the Company, addressed to the
     Underwriters and dated such Delivery Date, in form and substance reasonably
     satisfactory to the Underwriters, to the effect that:
 
             (i) To such counsel's knowledge, the shares of capital stock of
        each of LSI Logic Europe plc, LSI Logic K.K., Nihon Semiconductor, Inc.,
        LSI Logic Corporation of Canada, Inc., LSI Logic GmbH and LSI Logic S.A.
        issued to the Company are owned free and clear of any security interest,
        claim, lien or encumbrance created by the Company;
 
             (ii) To such counsel's knowledge and other than as set forth in the
        Prospectus, there are no legal or governmental proceedings pending to
        which the Company or any of its subsidiaries is a party or of which any
        property or assets of the Company or any of its subsidiaries is the
        subject which would require disclosure in the Prospectus; and, to such
        counsel's knowledge, no such proceedings are overtly threatened in
        writing by governmental authorities or by others;
 
             (iii) The Company is duly qualified to do business and is in good
        standing as a foreign corporation in each jurisdiction in which its
        ownership or lease of property or the conduct of its business requires
        such qualification (other than those jurisdictions in which the failure
        to so qualify would not have a material adverse effect on the Company
        and its subsidiaries taken as a whole);
 
             (iv) To such counsel's knowledge, there are no contracts or other
        documents which are described in the Prospectus or required to be filed
        as exhibits to the Registration Statement or any filing by the Company
        under the Exchange Act or by the Exchange Act or the Rules and
        Regulations which have not been so described or filed or incorporated
        therein by reference as permitted by the Exchange Act or the Rules and
        Regulations;
 
             (v) The issue and sale of the shares of Stock being delivered on
        such Delivery Date by the Company and the compliance by the Company with
        all of the provisions of this Agreement and the consummation of the
        transactions contemplated hereby will not conflict with or result in a
        breach or violation of any of the terms or provisions of, or constitute
        a default under any document listed as an exhibit to the Registration
        Statement or incorporated by reference into the Prospectus; and
 
             (vi) All of the issued shares of capital stock of the Company have
        been duly and validly authorized and issued, and are fully paid and
        nonassessable and conform to the description thereof contained in the
        Prospectus.
 
          In rendering such opinion, such counsel may state that his opinion is
     limited to matters governed by the Federal laws of the United States of
     America, the laws of the State of California and the General Corporation
     Law of Delaware.
 
          (g) The Underwriters shall have received from Brobeck, Phleger &
     Harrison, counsel for the Underwriters, such opinion or opinions, dated
     such Delivery Date, with respect to the issuance and sale of
 
                                       10
<PAGE>   11
 
     the Stock, the Registration Statement, the Prospectus and other related
     matters as the Underwriters may reasonably require, and the Company shall
     have furnished to such counsel such documents as they reasonably request
     for the purpose of enabling them to pass upon such matters.
 
          (h) At the time of execution of this Agreement, the Underwriters shall
     have received from Price Waterhouse a letter, in form and substance
     satisfactory to the Underwriters, addressed to the Underwriters and dated
     the date hereof (i) confirming that they are independent public accountants
     within the meaning of the Securities Act and are in compliance with the
     applicable requirements relating to the qualification of accountants under
     Rule 2-01 of Regulation S-X of the Commission, (ii) stating, as of the date
     hereof (or, with respect to matters involving changes or developments since
     the respective dates as of which specified financial information is given
     in the Prospectus, as of a date not more than five days prior to the date
     hereof), the conclusions and findings of such firm with respect to the
     financial information and other matters ordinarily covered by accountants'
     "comfort letters" to underwriters in connection with registered public
     offerings.
 
          (i) With respect to the letter of Price Waterhouse referred to in the
     preceding paragraph and delivered to the Underwriters concurrently with the
     execution of this Agreement (the "initial letter"), the Company shall have
     furnished to the Underwriters a letter (the "bring-down letter") of such
     accountants, addressed to the Underwriters and dated such Delivery Date (i)
     confirming that they are independent public accountants within the meaning
     of the Securities Act and are in compliance with the applicable
     requirements relating to the qualification of accountants under Rule 2-01
     of Regulation S-X of the Commission, (ii) stating, as of the date of the
     bring-down letter (or, with respect to matters involving changes or
     developments since the respective dates as of which specified financial
     information is given in the Prospectus, as of a date not more than five
     days prior to the date of the bring-down letter), the conclusions and
     findings of such firm with respect to the financial information and other
     matters covered by the initial letter and (iii) confirming in all material
     respects the conclusions and findings set forth in the initial letter.
 
          (j) The Company shall have furnished to the Underwriters a
     certificate, dated such Delivery Date, of its Chairman of the Board, its
     President or a Vice President and its Chief Financial Officer stating that:
 
             (i) The representations, warranties and agreements of the Company
        in Section 1 are true and correct as of such Delivery Date; the Company
        has complied with all its agreements contained herein; and the
        conditions set forth in Sections 7(a) and 7(k) have been fulfilled; and
 
             (ii) They have carefully examined the Registration Statement and
        the Prospectus and, in their opinion (A) as of the Effective Date, the
        Registration Statement and Prospectus did not include any untrue
        statement of a material fact and did not omit to state a material fact
        required to be stated therein or necessary to make the statements
        therein in light of the circumstances under which they were made not
        misleading, and (B) since the Effective Date no event has occurred which
        should have been set forth in a supplement or amendment to the
        Registration Statement or the Prospectus.
 
          (k) (i) Neither the Company nor any of its Significant Subsidiaries
     shall have sustained since the date of the latest audited financial
     statements included or incorporated by reference in the Prospectus any loss
     or interference with its business from fire, explosion, flood or other
     calamity, whether or not covered by insurance, or from any labor dispute or
     court or governmental action, order or decree, otherwise than as set forth
     or contemplated in the Prospectus or (ii) since such date there shall not
     have been any change in the capital stock other than shares issued pursuant
     to employee benefit plans, stock option plans or other employee
     compensation plans or pursuant to outstanding options, rights or warrants,
     or in long-term debt of the Company or any of its subsidiaries or any
     change, or any development involving a prospective change, in or affecting
     the general affairs, management, financial position, stockholders' equity
     or results of operations of the Company and its subsidiaries, otherwise
     than as set forth or contemplated in the Prospectus.
 
          (l) Subsequent to the execution and delivery of this Agreement there
     shall not have occurred any of the following: (i) trading in securities
     generally on the New York Stock Exchange or the American Stock
 
                                       11
<PAGE>   12
 
     Exchange or in the over-the-counter market, or trading in any securities of
     the Company on any exchange or in the over-the-counter market, shall have
     been suspended or minimum prices shall have been established on any such
     exchange or such market by the Commission, by such exchange or by any other
     regulatory body or governmental authority having jurisdiction, (ii) a
     banking moratorium shall have been declared by Federal or state
     authorities, (iii) the United States shall have become engaged in
     hostilities, there shall have been an escalation in hostilities involving
     the United States or there shall have been a declaration of a national
     emergency or war by the United States or (iv) there shall have occurred
     such a material adverse change in general economic, political or financial
     conditions (or the effect of international conditions on the financial
     markets in the United States shall be such) as to make it, in the judgment
     of a majority in interest of the several Underwriters, impracticable or
     inadvisable to proceed with the public offering or delivery of the Stock
     being delivered on such Delivery Date on the terms and in the manner
     contemplated in the Prospectus.
 
          (m) The New York Stock Exchange shall have approved the Stock for
     listing subject only to official notice of issuance.
 
          All opinions, letters, evidence and certificates mentioned above or
     elsewhere in this Agreement shall be deemed to be in compliance with the
     provisions hereof only if they are in form and substance reasonably
     satisfactory to counsel for the Underwriters.
 
     8.  Indemnification and Contribution.
 
          (a) The Company shall indemnify and hold harmless each Underwriter,
     its officers and employees and each person, if any, who controls any
     Underwriter within the meaning of the Securities Act, from and against any
     loss, claim, damage or liability, joint or several, or any action in
     respect thereof (including, but not limited to, any loss, claim, damage,
     liability or action relating to purchases and sales of Stock), to which
     that Underwriter, officer, employee or controlling person may become
     subject, under the Securities Act, Exchange Act, or otherwise, insofar as
     such loss, claim, damage, liability or action arises out of, or is based
     upon, (i) any untrue statement or alleged untrue statement of a material
     fact contained in any Preliminary Prospectus, the Registration Statement or
     the Prospectus or in any amendment or supplement thereto filed with the
     Commission or (ii) the omission or alleged omission to state therein a
     material fact or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading, and shall
     reimburse each Underwriter and each such officer, employee or controlling
     person promptly upon demand for any legal or other expenses reasonably
     incurred by that Underwriter, officer, employee or controlling person in
     connection with investigating or defending or preparing to defend against
     any such loss, claim, damage, liability or action as such expenses are
     incurred; provided, however, that the Company shall not be liable in any
     such case to the extent that any such loss, claim, damage, liability or
     action arises out of, or is based upon, any untrue statement or alleged
     untrue statement or omission or alleged omission made in any Preliminary
     Prospectus, the Registration Statement or the Prospectus or in any such
     amendment or supplement in reliance upon and in conformity with written
     information furnished to the Company by or on behalf of any Underwriter
     specifically for inclusion therein and provided further that as to any
     Preliminary Prospectus this indemnity agreement shall not inure to the
     benefit of any Underwriter, its officer or employee, or any person
     controlling that Underwriter on account of any loss, claim, damage,
     liability or action arising from the sale of Stock to any person by that
     Underwriter if that Underwriter failed to send or give a copy of the
     Prospectus (as the same may then be amended or supplemented if the Company
     shall have furnished such amendment or supplement), to that person
     asserting such loss, claim, damage, liability or action, and the untrue
     statement or alleged untrue statement of a material fact or omission or
     alleged omission to state a
 
                                       12
<PAGE>   13
 
     material fact in such Preliminary Prospectus was corrected in the
     Prospectus, unless such failure resulted from non-compliance by the Company
     with Section 5(b) or 5(c). The foregoing indemnity agreement is in addition
     to any liability which the Company may otherwise have to any Underwriter or
     to any officer, employee or controlling person of that Underwriter.
 
          (b) Each Underwriter, severally and not jointly, shall indemnify and
     hold harmless the Company, each of its directors, each of its officers who
     signed the Registration Statement and each person, if any, who controls the
     Company within the meaning of the Securities Act or Exchange Act, from and
     against any loss, claim, damage or liability, joint or several, or any
     action in respect thereof, to which the Company or any such director,
     officer or controlling person may become subject, under the Securities Act,
     Exchange Act or otherwise, insofar as such loss, claim, damage, liability
     or action arises out of, or is based upon, (i) any untrue statement or
     alleged untrue statement of a material fact contained in any Preliminary
     Prospectus, the Registration Statement or the Prospectus or in any
     amendment or supplement thereto filed with the Commission or (ii) the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements in light of the
     circumstances under which they were made therein not misleading, but in
     each case only to the extent that the untrue statement or alleged untrue
     statement or omission or alleged omission was made in reliance upon and in
     conformity with written information furnished to the Company through the
     Underwriters by or on behalf of that Underwriter specifically for inclusion
     therein, and shall reimburse through the Underwriters the Company and any
     such director, officer or controlling person for any legal or other
     expenses reasonably incurred by the Company or any such director, officer
     or controlling person in connection with investigating or defending or
     preparing to defend against any such loss, claim, damage, liability or
     action as such expenses are incurred. The foregoing indemnity agreement is
     in addition to any liability which any Underwriter may otherwise have to
     the Company or any such director, officer or controlling person.
 
          (c) Promptly after receipt by an indemnified party under this Section
     8 of notice of any claim or the commencement of any action, the indemnified
     party shall, if a claim in respect thereof is to be made against the
     indemnifying party under this Section 8, notify the indemnifying party in
     writing of the claim or the commencement of that action; provided, however,
     that the failure to notify the indemnifying party shall not relieve it from
     any liability which it may have under this Section 8 except to the extent
     it has been materially prejudiced by such failure and, provided further,
     that the failure to notify the indemnifying party shall not relieve it from
     any liability which it may have to an indemnified party otherwise than
     under this Section 8. If any such claim or action shall be brought against
     an indemnified party, and it shall notify the indemnifying party thereof,
     the indemnifying party shall be entitled to participate therein and, to the
     extent that it wishes, jointly with any other similarly notified
     indemnifying party, to assure the defense thereof with counsel satisfactory
     to the indemnified party. After notice from the indemnifying party to the
     indemnified party of its election to assume the defense of such claim or
     action, the indemnifying party shall not be liable to the indemnified party
     under this Section 8 for any legal or other expenses subsequently incurred
     by the indemnified party in connection with the defense thereof other than
     reasonable costs or investigation; provided, however, that any indemnified
     party shall have the right to employ separate counsel in any such action
     and to participate in the defense thereof but the fees and expenses of such
     counsel shall be at the expense of such indemnified party unless (i) the
     employment thereof has been specifically authorized by the indemnifying
     party in writing, (ii) such indemnified party shall have been advised by
     such counsel that there may be one or more legal defenses available to it
     which are different from or additional to those available to the
     indemnifying party and in the reasonable judgment of such counsel it is
     advisable for such indemnified party to employ separate counsel or (iii)
     the indemnifying party has failed to assume the defense of such action and
     employ counsel reasonably satisfactory to the indemnified party, in which
     case, if such indemnified party notifies the indemnifying party in writing
     that it elects to employ separate counsel at the expense of the
     indemnifying party, the indemnifying party shall not have the right to
     assume the defense of such action on behalf of such indemnified party, it
     being understood, however, that the indemnifying party shall not, in
     connection with any one such action or separate but substantially similar
     or related actions in the same jurisdiction arising out of the same general
     allegations or circumstances, be liable for the reasonable fees
 
                                       13
<PAGE>   14
 
     and expenses of more than one separate firm of attorneys at any time for
     all such indemnified parties, which firm shall be designated in writing by
     the Underwriters, if the indemnified parties under this Section 8 consist
     of any Underwriter or any of their respective controlling persons, or by
     the Company, if the indemnified parties under this Section consist of the
     Company or any of the Company's directors, officers or controlling persons.
     Each indemnified party, as a condition of the indemnity agreements
     contained in this Section 8 shall use its best efforts to cooperate with
     the indemnifying party in the defense of any such action or claim. No
     indemnifying party shall be liable for any settlement of any such action
     effected without its written consent (which consent shall not be
     unreasonably withheld), but if settled with its written consent or if there
     be a final judgment of the plaintiff in any such action, the indemnifying
     party agrees to indemnify and hold harmless any indemnified party from and
     against any loss of liability by reason of such settlement or judgment.
 
          (d) If the indemnification provided for in this Section 8 shall for
     any reason be unavailable to or insufficient to hold harmless an
     indemnified party under Section 8(a) or 8(b) in respect of any loss, claim,
     damage or liability, or any action in respect thereof, referred to therein,
     then each indemnifying party shall, in lieu of indemnifying such
     indemnified party, contribute to the amount paid or payable by such
     indemnified party as a result of such loss, claim, damage or liability, or
     action in respect thereof, (i) in such proportion as shall be appropriate
     to reflect the relative benefits received by the Company on the one hand
     and the Underwriters on the other from the offering of the Stock or (ii) if
     the allocation provided by clause (i) above is not permitted by applicable
     law, in such proportion as is appropriate to reflect not only the relative
     benefits referred to in clause (i) above but also the relative fault of the
     Company on the one hand and the Underwriters on the other with respect to
     the statements or omissions which resulted in such loss, claim, damage or
     liability, or action in respect thereof, as well as any other relevant
     equitable considerations. The relative benefits received by the Company on
     the one hand and the Underwriters on the other with respect to such
     offering shall be deemed to be in the same proportion as the total net
     proceeds from the offering of the Stock purchased under this Agreement
     (before deducting expenses) received by the Company on the one hand, and
     the total underwriting discounts and commissions received by the
     Underwriters with respect to the shares of the Stock purchased under this
     Agreement, on the other hand, bear to the total gross proceeds from the
     offering of the shares of the Stock under this Agreement, in each case as
     set forth in the table on the cover page of the Prospectus. The relative
     fault shall be determined by reference to whether the untrue or alleged
     untrue statement of a material fact or omission or alleged omission to
     state a material fact relates to information supplied by the Company or the
     Underwriters, the intent of the parties and their relative knowledge,
     access to information and opportunity to correct or prevent such statement
     or omission. The Company and the Underwriters agree that it would not be
     just and equitable if contributions pursuant to this Section 8 were to be
     determined by pro rata allocation (even if the Underwriters were treated as
     one entity for such purpose) or by any other method of allocation which
     does not take into account the equitable considerations referred to herein.
     The amount paid or payable by an indemnified party as a result of the loss,
     claim, damage or liability, or action in respect thereof, referred to above
     in this Section 8 shall be deemed to include, for purposes of this Section
     8(d), any legal or other expenses reasonably incurred by such indemnified
     party in connection with investigating or defending any such action or
     claim. Notwithstanding the provisions of this Section 8(d), no Underwriter
     shall be required to contribute any amount in excess of the amount by which
     the total price at which the Stock underwritten by it and distributed to
     the public was offered to the public exceeds the amount of any damages
     which such Underwriter has otherwise paid or become liable to pay by reason
     of any untrue or alleged untrue statement or omission or alleged omission.
     No person guilty of fraudulent misrepresentation (within the meaning of
     Section 11(f) of the Securities Act) shall be entitled to contribution from
     any person who was not guilty of such fraudulent misrepresentation. The
     Underwriters' obligations to contribute as provided in this Section 8(d)
     are several in proportion to their respective underwriting obligations and
     not joint. No party shall be liable for contribution with respect to any
     action or claim settled without its consent; provided, however, that such
     consent shall not be unreasonably withheld.
 
          (e) The Underwriters severally confirm that the statements with
     respect to the public offering of the Stock set forth on the cover page of,
     and under the caption "Underwriting" in, the Prospectus are correct
 
                                       14
<PAGE>   15
 
     and constitute the only information furnished in writing to the Company by
     or on behalf of the Underwriters specifically for inclusion in the
     Registration Statement and the Prospectus.
 
     9.  Defaulting Underwriters.  If, on either Delivery Date, any Underwriter
defaults in the performance of its obligations under this Agreement, the
remaining non-defaulting Underwriters shall be obligated to purchase the Stock
which the defaulting Underwriter agreed but failed to purchase on such Delivery
Date in the respective proportions which the number of shares of the Firm Stock
set opposite the name of each remaining non-defaulting Underwriter in Schedule 1
hereto bears to the total number of shares of the Firm Stock set opposite the
names of all the remaining non-defaulting Underwriters in Schedule 1 hereto.
 
     Nothing contained herein shall relieve a defaulting Underwriter of any
liability it may have to the Company for damages caused by its default. If other
underwriters are obligated or agree to purchase the Stock of a defaulting or
withdrawing Underwriter, either the Underwriters or the Company may postpone the
Delivery Date for up to seven full business days in order to effect any changes
that in the opinion of counsel for the Company or counsel for the Underwriters
may be necessary in the Registration Statement, the Prospectus or in any other
document or arrangement.
 
     10.  Termination.  The obligations of the Underwriters hereunder may be
terminated by the Underwriters by notice given to and received by the Company
prior to delivery of and payment for the Firm Stock if, prior to that time, any
of the events described in Sections 7(k) or 7(l), shall have occurred or if the
Underwriters shall decline to purchase the Stock for any reason permitted under
this Agreement.
 
     11.  Reimbursement of Underwriters' Expenses.  If (a) the Company shall
fail to tender the Stock for delivery to the Underwriters for any reason
permitted under this Agreement or (b) the Underwriters shall decline to purchase
the Stock for any reason permitted under this Agreement (including the
termination of this Agreement pursuant to Section 10, the Company shall
reimburse the Underwriters for the reasonable fees and expenses of their counsel
and for such other out-of-pocket expenses as shall have been incurred by them in
connection with this Agreement and the proposed purchase of the Stock, and upon
demand the Company shall pay the full amount thereof to the Underwriters.
 
     12.  Notices, etc.  All statements, requests, notices and agreements
hereunder shall be in writing, and:
 
          (a) if to the Underwriters, shall be delivered or sent by mail, telex
     or facsimile transmission to Lehman Brothers Inc., Three World Financial
     Center, New York, New York 10285, Attention: Syndicate Department (Fax:
     212-528-8822), with a copy, in the case of any notice pursuant to Section
     8(d), to the Director of Litigation, Office of the General Counsel, Lehman
     Brothers Inc., 2 World Trade Center, 15th Floor, New York, NY 10048;
 
          (b) if to the Company shall be delivered or sent by mail, telex or
     facsimile transmission to the address of the Company set forth in the
     Registration Statement, Attention: David E. Sanders, General Counsel (Fax:
     408-433-6896),
 
Any such statements, requests, notices or agreements shall take effect at the
time of receipt thereof. The Company shall be entitled to act and rely upon any
request, consent, notice or agreement given or made on behalf of the
Underwriters by Lehman Brothers Inc. on behalf of the Underwriters.
 
     13.  Persons Entitled to Benefit of Agreement.  This Agreement shall inure
to the benefit of and be binding upon the Underwriters, the Company, and their
respective successors. This Agreement and the terms and provisions hereof are
for the sole benefit of only those persons, except that (A) the representations,
warranties, indemnities and agreements of the Company contained in this
Agreement shall also be deemed to be for the benefit of the person or persons,
if any, who control any Underwriter within the meaning of Section 15 of the
Securities Act and (B) the indemnity agreement of the Underwriters contained in
Section 8(c) of this Agreement shall be deemed to be for the benefit of
directors of the Company, officers of the Company who have signed the
Registration Statement and any person controlling the Company within the meaning
of Section 15 of the Securities Act. Nothing in this Agreement is intended or
shall be construed to give any person, other than the persons referred to in
this Section 13, any legal or equitable right, remedy or claim under or in
respect of this Agreement or any provision contained herein.
 
                                       15
<PAGE>   16
 
     14.  Survival.  The respective indemnities, representations, warranties and
agreements of the Company and the Underwriters contained in this Agreement or
made by or on behalf on them, respectively, pursuant to this Agreement, shall
survive the delivery of and payment for the Stock and shall remain in full force
and effect, regardless of any investigation made by or on behalf of any of them
or any person controlling any of them.
 
     15.  Definition of the Terms "Business Day" and "Significant
Subsidiary".  For purposes of this Agreement, (a) "business day" means any day
on which the New York Stock Exchange, Inc. is open for trading and (b)
"Significant Subsidiary" shall mean each of LSI Logic Europe plc, LSI Logic
K.K., Nihon Semiconductor, Inc., LSI Logic Corporation of Canada, Inc., LSI
Logic GmbH and LSI Logic S.A.
 
     16.  Governing Law.  This Agreement shall be governed by and construed in
accordance with the laws of New York.
 
     17.  Counterparts.  This Agreement may be executed in one or more
counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.
 
     18.  Headings.  The headings herein are inserted for convenience of
reference only and are not intended to be part of, or to affect the meaning or
interpretation of, this Agreement.
 
     If the foregoing correctly sets forth the agreement between the Company and
the Underwriters, please indicate your acceptance in the space provided for that
purpose below.
 
                                            Very truly yours,
 
                                            LSI LOGIC CORPORATION
 
                                            By
                                             Albert A. Pimentel
                                             Senior Vice President, Finance
                                             and Chief Financial Officer
 
Accepted:
 
LEHMAN BROTHERS INC.
MERRILL LYNCH, PIERCE, FENNER & SMITH
             INCORPORATED
MONTGOMERY SECURITIES
PRUDENTIAL SECURITIES INCORPORATED
 
     By LEHMAN BROTHERS INC.
 
     By
       Michael S. Wishart
       Managing Director
 
                                       16
<PAGE>   17
 
                                   SCHEDULE 1
 
<TABLE>
<CAPTION>
                                                                                  NUMBER OF
                                  UNDERWRITERS                                     SHARES
- --------------------------------------------------------------------------------  ---------
<S>                                                                               <C>
Lehman Brothers Inc. ...........................................................
Merrill Lynch, Pierce, Fenner & Smith
             Incorporated.......................................................
Montgomery Securities...........................................................
Prudential Securities Incorporated..............................................
                                                                                  ---------
          Total.................................................................  5,000,000
                                                                                  ==========
</TABLE>
 
                                       17
<PAGE>   18
 
                                 SCHEDULE 1(E)
 
                              LIST OF SUBSIDIARIES
 
<TABLE>
<CAPTION>
                                                            JURISDICTION OF     DIRECT/INDIRECT
                    NAME OF SUBSIDIARY                       INCORPORATION         OWNERSHIP
- ----------------------------------------------------------  ---------------     ---------------
<S>                                                         <C>                 <C>
LSI Logic Europe plc......................................  United Kingdom             98%
LSI Logic Corporation of Canada, Inc......................  Canada                     56%
LSI Logic K.K.............................................  Japan                      78%
Nihon Semiconductor, Inc..................................  Japan                     100%
LSI Logic GmbH............................................  Germany                    98%
LSI Logic S.A.............................................  France                     98%
</TABLE>
 
                                       18

<PAGE>   1
 
                                  EXHIBIT 5.1
 
                       Wilson, Sonsini, Goodrich & Rosati
                            Professional Corporation
                               650 Page Mill Road
                          Palo Alto, California 94304
 
                                                                   June 26, 1995
 
LSI Logic Corporation
1551 McCarthy Boulevard
Milpitas, CA 95035
 
       Re:  Registration Statement on Form S-3
 
Ladies and Gentlemen:
 
     We have examined the Registration Statement on Form S-3 to be filed by LSI
Logic Corporation (the "Company") with the Securities and Exchange Commission
(the "Commission") on June 27, 1995 (as such may be further amended or
supplemented, the "Registration Statement"), in connection with the registration
under the Securities Act of 1933, as amended, of 5,750,000 shares of the
Company's Common Stock (the "Shares"). The Shares, which include up to 750,000
shares of Common Stock issuable pursuant to an over-allotment option granted to
the underwriters (the "Underwriters"), are to be sold to the Underwriters as
described in such Registration Statement for sale to the public. As counsel to
the Company in connection with this transaction, we have examined the
proceedings taken and are familiar with the proceedings proposed to be taken by
the Company in connection with the issuance and sale of the Shares.
 
     Based on the foregoing, it is our opinion that, upon conclusion of the
proceedings being taken or contemplated by us, as your counsel, to be taken
prior to the issuance of the Shares and upon completion of the proceedings taken
in order to permit such transactions to be carried out in accordance with the
securities laws of various states where required, the Shares, when issued and
sold in the manner described in the Registration Statement, will be legally and
validly issued, fully paid and nonassessable.
 
     We consent to the use of this opinion as an exhibit to the Registration
Statement and any related short-form Registration Statement filed to register
additional securities ("Short-form Registration Statement"), and further consent
to the use of our name wherever appearing in the Registration Statement and any
Short-form Registration Statement, including the prospectus constituting a part
thereof, and any amendment thereto, which has been approved by us.
 
                                            Very truly yours,
 
                                            WILSON, SONSINI, GOODRICH & ROSATI
                                            Professional Corporation


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