CATALYST SEMICONDUCTOR INC
SC 13D, 1998-11-24
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1



                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  -------------

                                  SCHEDULE 13D
                                 (RULE 13d-101)

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO.  )*

                          Catalyst Semiconductor, Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   148881-10-5
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

                                Roland Duchatelet
                                    Elex n.v.
                                Transportstraat 1
                               B-3980 Tessenderlo
                                     Belgium
                                 +32 13 67 21 35
- -------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                               September 21, 1998
- -------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[X].

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


<PAGE>   2

                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------



- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            ELEX N.V.
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (A) [ ]
                                                                       (B) [X]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
            WC

- --------------------------------------------------------------------------------
5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
            PURSUANT TO ITEMS 2(D) OR 2(E)                                  [ ]

- --------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
            BELGIUM
- --------------------------------------------------------------------------------
                   7     SOLE VOTING POWER
                         5,500,000
    NUMBER OF     --------------------------------------------------------------
     SHARES        8     SHARED VOTING POWER
  BENEFICIALLY                        -0-
    OWNED BY      --------------------------------------------------------------
      EACH         9     SOLE DISPOSITIVE POWER
    REPORTING            5,500,000
     PERSON       --------------------------------------------------------------
      WITH         10    SHARED DISPOSITIVE POWER
                                      -0-

- --------------------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            5,500,000

- --------------------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
            CERTAIN SHARES*                                                 [ ]

- --------------------------------------------------------------------------------
13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 39.4% (BASED
            UPON 13,961,722 SHARES OUTSTANDING REPRESENTING THE 4,000,000
            SECURITIES PURCHASED BY ELEX N.V. ON SEPTEMBER 21, 1998 AND
            9,961,722 SHARES OUTSTANDING AS OF SEPTEMBER 15, 1998 AS DISCLOSED
            ON ISSUERS FORM 10-Q FOR THE QUARTER ENDED AUGUST 2, 1998)

- --------------------------------------------------------------------------------
14          TYPE OF REPORTING PERSON*
            CO
- --------------------------------------------------------------------------------



                                      -2-
<PAGE>   3
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------




- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            STICHTING ADMINISTRATIEKANTOOR XPEQT
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (A) [ ]
                                                                        (B) [X]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
            NOT APPLICABLE

- --------------------------------------------------------------------------------
5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
            ITEMS 2(D) OR 2(E)                                               [ ]

- --------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
            NETHERLANDS
- --------------------------------------------------------------------------------
                   7     SOLE VOTING POWER
                         DISCLAIMED.  SEE 11 BELOW
    NUMBER OF    ---------------------------------------------------------------
     SHARES        8     SHARED VOTING POWER
  BENEFICIALLY                        -0-
    OWNED BY     ---------------------------------------------------------------
      EACH         9     SOLE DISPOSITIVE POWER
    REPORTING            DISCLAIMED.  SEE 11 BELOW
     PERSON      ---------------------------------------------------------------
      WITH         10    SHARED DISPOSITIVE POWER
                                      -0-

- --------------------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            BENEFICIAL OWNERSHIP OF ALL SHARES IS DISCLAIMED BY STICHTING
            ADMINISTRATIEKANTOOR XPEQT

- --------------------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
            CERTAIN SHARES*                                                  [ ]

- --------------------------------------------------------------------------------
13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            DISCLAIMED.  SEE 11 ABOVE

- --------------------------------------------------------------------------------
14          TYPE OF REPORTING PERSON*
            CO
- --------------------------------------------------------------------------------



                                      -3-
<PAGE>   4
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------




- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            ROLAND DUCHATELET
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (A) [ ]
                                                                        (B) [X]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
            NOT APPLICABLE

- --------------------------------------------------------------------------------
5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
            PURSUANT TO ITEMS 2(D) OR 2(E)                                   [ ]

- --------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
            BELGIUM
- --------------------------------------------------------------------------------
                   7     SOLE VOTING POWER
                         DISCLAIMED.  SEE 11 BELOW
    NUMBER OF    ---------------------------------------------------------------
     SHARES        8     SHARED VOTING POWER
  BENEFICIALLY                        -0-
    OWNED BY     ---------------------------------------------------------------
      EACH         9     SOLE DISPOSITIVE POWER
    REPORTING            DISCLAIMED.  SEE 11 BELOW
     PERSON      ---------------------------------------------------------------
      WITH         10    SHARED DISPOSITIVE POWER
                                      -0-

- --------------------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            BENEFICIAL OWNERSHIP OF ALL SHARES IS DISCLAIMED BY ROLAND 
            DUCHATELET


- --------------------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
            CERTAIN SHARES*                                                  [ ]

- --------------------------------------------------------------------------------
13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11

            DISCLAIMED.  SEE 11 ABOVE

- --------------------------------------------------------------------------------
14          TYPE OF REPORTING PERSON*
            IN
- --------------------------------------------------------------------------------



                                      -4-
<PAGE>   5
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------




- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            RUDI DE WINTER
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (A) [ ]
                                                                       (B) [X]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
            NOT APPLICABLE

- --------------------------------------------------------------------------------
5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
            PURSUANT TO ITEMS 2(D) OR 2(E)                                  [ ]

- --------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
            BELGIUM
- --------------------------------------------------------------------------------
                   7     SOLE VOTING POWER
                         DISCLAIMED.  SEE 11 BELOW
    NUMBER OF    ---------------------------------------------------------------
     SHARES        8     SHARED VOTING POWER
  BENEFICIALLY                        -0-
    OWNED BY     ---------------------------------------------------------------
      EACH         9     SOLE DISPOSITIVE POWER
    REPORTING            DISCLAIMED.  SEE 11 BELOW
     PERSON      ---------------------------------------------------------------
      WITH         10    SHARED DISPOSITIVE POWER
                                      -0-

- --------------------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            BENEFICIAL OWNERSHIP OF ALL SHARES IS DISCLAIMED BY RUDI DE WINTER

- --------------------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
            CERTAIN SHARES*                                                  [ ]

- --------------------------------------------------------------------------------
13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            DISCLAIMED. SEE 11 ABOVE.

- --------------------------------------------------------------------------------
14          TYPE OF REPORTING PERSON*
            IN
- --------------------------------------------------------------------------------




                                       -5-
<PAGE>   6
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------




- --------------------------------------------------------------------------------
1           NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            FRANCOISE CHOMBAR
- --------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (A) [ ]
                                                                       (B) [X]
- --------------------------------------------------------------------------------
3           SEC USE ONLY

- --------------------------------------------------------------------------------
4           SOURCE OF FUNDS*
            NOT APPLICABLE

- --------------------------------------------------------------------------------
5           CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
            PURSUANT TO ITEMS 2(D) OR 2(E)                                  [ ]

- --------------------------------------------------------------------------------
6           CITIZENSHIP OR PLACE OF ORGANIZATION
            BELGIUM
- --------------------------------------------------------------------------------
                   7     SOLE VOTING POWER
                         DISCLAIMED.  SEE 11 BELOW
    NUMBER OF    ---------------------------------------------------------------
     SHARES        8     SHARED VOTING POWER
  BENEFICIALLY                        -0-
    OWNED BY     ---------------------------------------------------------------
      EACH         9     SOLE DISPOSITIVE POWER
    REPORTING            DISCLAIMED.  SEE 11 BELOW
     PERSON      ---------------------------------------------------------------
      WITH         10    SHARED DISPOSITIVE POWER
                                      -0-

- --------------------------------------------------------------------------------
11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            BENEFICIAL OWNERSHIP OF ALL SHARES IS DISCLAIMED BY FRANCOISE
            CHOMBAR

- --------------------------------------------------------------------------------
12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
            CERTAIN SHARES*                                                  [ ]

- --------------------------------------------------------------------------------
13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            DISCLAIMED.  SEE 11 ABOVE

- --------------------------------------------------------------------------------
14          TYPE OF REPORTING PERSON*
            IN

- --------------------------------------------------------------------------------


                                      -6-
<PAGE>   7
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


ITEM 1 - SECURITY AND ISSUER

        This statement relates to the Common Stock, no par value (the "Common
Stock"), of Catalyst Semiconductor, Inc., a Delaware corporation ("Issuer"). The
principal executive offices of Issuer are located at 1250 Borregas Avenue,
Sunnyvale, California 94089.

ITEM 2 - IDENTITY AND BACKGROUND

        This statement is being filed by Elex n.v., organized under the laws of
the country of Belgium ("Elex"), Stichting Administratiekantoor XPEQT, organized
under the laws of the country of the Netherlands ("XPEQT"), Mr. Roland
Duchatelet, Mr. Rudi De Winter and Mrs. Francoise Chombar (collectively the
"Reporting Persons"). Each of the Reporting Persons agrees that this Schedule
13D is being filed of behalf of each of them. Elex conducts its principal
business operations in Tessenderlo, Belgium, at Transportstraat 1, B-3980
Tessenderlo, Belgium. XPEQT conducts its principal business operations in
Utrecht, Netherlands, at Fregatstraat 99, 3534RC Utrecht, Netherlands. Mr.
Duchatelet's address is rue Leon de Mars, 5550 Rienne-Gedinne, Belgium. Mr. De
Winter's address is Corbiestraat 9, 3550 Heusden-Zolder, Belgium. Mrs. Chombar's
address is Corbiestraat 9, 3550 Heusden-Zolder, Belgium.

        The names, business addresses, present principal occupations and
citizenship of the directors and executive officers of Elex and XPEQT are set
forth in the attached Appendix I, which is incorporated by reference.

        Elex is a holding company and a wholly-owned subsidiary of XPEQT. Its
main activities are providing (a) financial services for all companies held by
Elex (the "Elex Group"), and (b) development services for Melexis n.v., the
primary operating company held by Elex which is listed on EASDAQ. The Elex Group
develops, manufactures, markets, licenses, and supports a wide range of
integrated circuit products.

        XPEQT is a holding Company and is wholly owned by Mr. Roland Duchatelet,
Mr. Rudi De Winter and Mrs. Francoise Chombar. Its only activities are the
administration of its Elex shares. XPEQT is a party to this filing solely
because Elex is a wholly-owned subsidiary of XPEQT.

        Mr. Roland Duchatelet, Mr. Rudi De Winter and Mrs. Francoise Chombar are
parties to this filing solely because they hold a controlling interest in XPEQT.

        During the last five years neither any Reporting Person nor, to the
knowledge of the applicable Reporting Person, any director or officer of any
Reporting Person, has been (i) convicted in a criminal proceeding, or (ii) a
party to a civil proceeding of a judicial or administrative body of competent
jurisdiction and as a result of such proceeding was or is subject to judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

ITEM 3 - SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

        In September 1998, Elex purchased a total of 4,000,000 shares of
Issuer's Common Stock (the "Purchased Common Stock") from Issuer for a price of
$0.25 per share or $1,000,000.00 in the aggregate. Elex effectuated this
purchase pursuant to a Common Stock Purchase Agreement dated September 14, 1998
(the "Agreement") between Elex and Issuer. The source of Elex's consideration
under the Agreement was Elex's working capital. Elex did not purchase any of the
Purchased Common Stock with borrowed funds. Elex had previously purchased
1,500,000 shares of Common Stock from Issuer in exchange for $1.00 per share in
June 1998 as reported on a Schedule 13G previously filed.

ITEM 4 - PURPOSE OF TRANSACTION

        Elex acquired the Purchased Common Stock as an investment. Elex had
previously acquired 1,500,000 shares of Common Stock from Issuer in June 1998.
Subject to compliance with federal, state and other applicable securities laws
and to 




                                      -7-
<PAGE>   8
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


the terms and conditions set forth set forth in the Standstill Agreement
referenced in Item 5 below, Elex may sell any of its Common Stock from time to
time in the open market, subject to registration, or in privately negotiated
transactions.

        No Reporting Person has any present intent or proposals that relate to
or would result in: (i) the acquisition by any person of additional securities
of Issuer, or the disposition of securities of Issuer; (ii) an extraordinary
corporate transaction, such as a merger, reorganization or liquidation,
involving Issuer or any of its subsidiaries; (iii) a sale or transfer of a
material amount of assets of Issuer or any of its subsidiaries; (iv) a change in
the present Board of Directors or management of Issuer, including any plans or
proposals to change the number or term of Directors or to fill any existing
vacancies on the Board; (v) any material change in the present capitalization or
dividend policy of Issuer; (vi) any other material change in Issuer 's business
or corporate structure; (vii) changes in Issuer's charter, bylaws or instruments
corresponding thereto or other actions which may impede the acquisition of
control of Issuer by any person; (viii) causing a class of securities of Issuer
to be delisted from a national securities exchange or to cease to be authorized
to be quoted in an inter-dealer quotation system of a registered national
securities association; (ix) a class of equity securities of Issuer becoming
eligible for termination of registration pursuant to Section 12(g)(4) of the
Exchange Act; or (x) any action similar to those enumerated above; except for
the following: as to clause (i) above Elex has granted Issuer a 12-month right
to require Elex to purchase up to an additional 4,000,000 shares of Common Stock
at a purchase price of $0.25 per share.

        The Reporting Persons reserve the right to determine in the future
whether to change the purpose or purposes described above or whether to adopt
plans or proposals of the type specified above.

ITEM 5 - INTEREST IN SECURITIES OF ISSUER

        Elex's ownership of Common Stock represents approximately 39.4% of
Issuer's outstanding Common Stock (based upon 13,961,722 shares outstanding
representing the 4,000,000 shares of Common Stock purchased from Issuer by Elex
on September 21, 1998 and 9,961,722 shares outstanding as of September 15, 1998
as disclosed on Issuer's Form 10-Q for the quarter ended August 2, 1998).

        On September 14, 1998, Elex and Issuer entered into the Agreement,
whereby Elex agreed to acquire 4,000,000 shares of Common Stock from Issuer at
$0.25 per share for an aggregate purchase price of $1,000,000. The acquisition
of the Common Stock closed on September 21, 1998. Elex had previously purchased
1,500,000 shares of Common Stock of Issuer in exchange for $1.00 per share in
June 1998 as previously reported on the Schedule 13G previously filed. Elex has
sole voting and dispositive power over all such shares of Common Stock. However,
under the terms of an Amended and Restated Standstill Agreement dated as of
September 14, 1998 (the "Standstill Agreement") between Issuer and Elex, Elex
has agreed not to: (a) acquire additional shares of Common Stock; (b) deposit
its shares of Common Stock in a voting trust or subject such shares to a voting
agreement; (c) act to seek to control the management, Board of Directors or
policies of the Company; (d) solicit proxies with respect to or seek to
influence the voting of Issuer's outstanding Common Stock; or (e) join or form a
group to accomplish any of the foregoing. Further, Elex will not sell, assign or
transfer more than 100,000 shares of Common Stock to any purchaser unless such
purchaser becomes a party to the Standstill Agreement. In addition, Elex will
vote its shares for proxies solicited by the Company and for nominees for
directors designated by the Company.

        Except as set forth above, no Reporting Perosn has been a party to any
transaction in the Common Stock, other than the Agreement, in the last 60 days.
Each Reporting Perosn knows of no other person that has the right to receive or
the power to direct the receipt of dividends from, or the proceeds from the sale
of, the Common Stock held by Elex.

ITEM 6 - CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT 
         TO SECURITIES OF ISSUER

        On September 14, 1998, Elex and Issuer entered into the Agreement,
whereby Elex agreed to acquire 4,000,000 shares of Common Stock from Issuer for
a price of $1,000,000.00. The acquisition of the Purchased Common Shares closed
on September 21, 1998. In addition to the terms of the Agreement and the
Standstill Agreement discussed in Item 5 above, in the Agreement Elex also
granted Issuer a 12-month right to require Elex to purchase an additional
4,000,000 shares of Common 




                                      -8-
<PAGE>   9
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


Stock on the same terms and conditions as the Purchased Common Stock. These
additional shares would also be subject to the terms and conditions of the
Standstill Agreement.

ITEM 7 - MATERIAL TO BE FILED AS EXHIBITS

<TABLE>
<CAPTION>
        Exhibit       Description
        -------       -----------
        <S>        <C>  
          1        Common Stock Purchase Agreement dated as September 14, 1998
                   between Issuer and Elex.

          2        Amended and Restated Standstill Agreement dated as of 
                   September 14, 1998 between Issuer and Elex.
</TABLE>



                                      -9-
<PAGE>   10
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


SIGNATURE

        After reasonable inquiry and to the best of my knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.


Date:  November 20, 1998                ELEX N.V.


                                        By: /s/ Roland Duchatelet
                                            --------------------------------
                                                Roland Duchatelet
                                                Chairman of the Board


Date:  November 20, 1998                STICHTING ADMINISTRATIEKANTOOR XPEQT


                                        By: /s/ Roland Duchatelet
                                            --------------------------------
                                                Roland Duchatelet
                                                Director


Date:  November 20, 1998                    /s/ Roland Duchatelet
                                            --------------------------------
                                                Roland Duchatelet


Date:  November 20, 1998                    /s/  Rudi De Winter
                                            --------------------------------
                                                 Rudi De Winter


Date:  November 20, 1998                    /s/ Francoise Chombar
                                            --------------------------------
                                                Francoise Chombar

        The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative (other than an
executive officer or general partner of this filing person), evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)




                                      -10-
<PAGE>   11
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


                           APPENDIX I TO SCHEDULE 13D


ELEX N.V.

EXECUTIVE OFFICERS AND DIRECTORS

        Set forth below are the names, business addresses and present principal
occupation or employment and citizenship of each executive officer and director
of Elex n.v.:

<TABLE>
<CAPTION>
Name and Address of
Executive Officers     Present and Principal Occupation                            Citizenship
- ------------------     --------------------------------                            -----------
<S>                    <C>                                                          <C>
Roland Duchatelet      Chairman of the Board and Chief Executive Officer of Elex    Belgium
  Transportstraat 1    n.v.; Chairman of the Board of Melexis n.v.; Chairman of 
  B-3980 Tessenderlo   the Board of of EPIQ n.v.; Director of SIGMA DELTA 
  Belgium              HOLDING NV, XFAB GmbH, EPIQ sarl, SM2E S.A. and 
                       Stichting Administratiekantoor XPEQT

Rudi De Winter         Executive Director and Chief Executive Officer of Elex      Belgium
  Transportstraat 1,   n.v.; Executive Director and Chief Executive Officer of
  B-3980 Tessenderlo   Melexis n.v.; Director of SM2E S.A. and Stichting
  Belgium              Administratiekantoor XPEQT

Karen van Griensven    Chief Financial Officer of Elex n.v. and of Melexis n.v.    Belgium 
  Transportstraat 1
  B-3980 Tessenderlo
  Belgium

<CAPTION>
Name and Address of
Directors (who are
not also Executive    
Officers)               Present and Principal Occupation                            Citizenship
- -------------------    ---------------------------------                           -----------
<S>                    <C>                                                         <C>
Maria Hoftle           Director of Elex n.v.                                       Netherlands
  Transportstraat 1
  B-3980 Tessenderlo
  Belgium
</TABLE>



                                      -11-
<PAGE>   12
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


STICHTING ADMINISTRATIEKANTOOR XPEQT
EXECUTIVE OFFICERS AND DIRECTORS

        Set forth below are the names, business addresses and present principal
occupation or employment and citizenship of each executive officer and director
of Stichting Administratiekantoor XPEQT:


<TABLE>
<CAPTION>
Name and Address of
Executive Officers     Present and Principal Occupation                            Citizenship
- ------------------     --------------------------------                            -----------
<S>                    <C>                                                         <C>
Rudi De Winter         Executive Director and Chief Executive Officer of Elex      Belgium
  Transportstraat 1,   n.v.; Executive Director and Chief Executive Officer of
  B-3980 Tessenderlo   Melexis n.v.; Director of SM2E S.A. and Stichting
  Belgium              Administratiekantoor XPEQT

Roland Duchatelet      Chairman of the Board and Chief Executive Officer of Elex   Belgium 
  Transportstraat 1    n.v.; Chairman of the Board of Melexis n.v.; Chairman of 
  B-3980 Tessenderlo   the Board of of EPIQ n.v.; Director of SIGMA DELTA 
  Belgium              HOLDING NV, XFAB GmbH, EPIQ sarl, SM2E S.A. and Stichting
                       Administratiekantoor XPEQT

Francoise Chombar      Director of Stichting Administratiekantoor XPEQT, EPIQ      Netherlands
  Corbiestraat 9       n.v., SIGMA DELTA HOLDINGS NV, SM2E S.A. and Melexis n.v.
  3550 Heusden-Zolder
  Belgium

<CAPTION>
Name and Address of
Directors (who are
not also Executive     
Officers)              Present and Principal Occupation                            Citizenship
- -------------------    --------------------------------                            ------------
<S>                    <C>                                                         <C>
None
</TABLE>



                                      -12-
<PAGE>   13
                                  SCHEDULE 13D

- --------------------------
CUSIP NO. 148881-10-5
- --------------------------


                          EXHIBIT INDEX TO SCHEDULE 13D


<TABLE>
<CAPTION>
                                                                                              PAGE
EXHIBIT    DESCRIPTION                                                                       NUMBER
- -------    -----------                                                                       ------
<S>        <C>                                                                               <C>
1          Common Stock Purchase Agreement dated as of September 14, 1998 between Issuer
           and Elex.

2          Amended and Restated Standstill Agreement dated as of September 14, 1998
           between Issuer and Elex.
</TABLE>



                                      -13-

<PAGE>   1



                          CATALYST SEMICONDUCTOR, INC.







                         COMMON STOCK PURCHASE AGREEMENT

                                     BETWEEN

                          CATALYST SEMICONDUCTOR, INC.

                                       AND

                                    ELEX N.V.



                               SEPTEMBER 14, 1998


<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                          PAGE
                                                                                          ----
<S>                                                                                         <C>
1. Purchase and Sale of Common Stock.........................................................1

        1.1 First Sale and Issuance of Common Stock..........................................1
        1.2 First Closing; Delivery..........................................................1
        1.3 Second Sale and Issuance of Common Stock.........................................1
        1.4 Second Closing; Delivery.........................................................2

2. Representations and Warranties of the Company.............................................2

        2.1 Organization, Good Standing and Qualification....................................2
        2.2 Capitalization...................................................................2
        2.3 Authorization....................................................................3
        2.4 Valid Issuance of Securities.....................................................3
        2.5 Governmental Consents............................................................3
        2.6 Litigation.......................................................................3
        2.7 Corporate Documents..............................................................4

3. Representations and Warranties of Purchaser...............................................4

        3.1 Authorization; Share Ownership...................................................4
        3.2 Purchase Entirely for Own Account................................................4
        3.3 Disclosure of Information........................................................4
        3.4 Restricted Securities............................................................4
        3.5 No Public Market.................................................................5
        3.6 Legends..........................................................................5
        3.7 Accredited Investor; Sophistication..............................................5
        3.8 Foreign Investors................................................................6

4. Conditions of Purchaser's Obligations at Closing..........................................6

        4.1 Representations and Warranties...................................................6
        4.2 Performance......................................................................6
        4.3 Compliance Certificate...........................................................6
        4.4 Qualifications...................................................................6
        4.5 Amendment to Rights Agreement....................................................6

5. Conditions of the Company's Obligations at Closing........................................7

        5.1 Representations and Warranties...................................................7
        5.2 Performance......................................................................7
        5.3 Qualifications...................................................................7
        5.4 Standstill Agreement.............................................................7
        5.5 Amendment to Rights Agreement....................................................7
        5.6 Fairness Opinion.................................................................7

6. Repurchase Right..........................................................................7

        6.1 Repurchase Right.................................................................7
</TABLE>



                                      -i-

<PAGE>   3

<TABLE>
<CAPTION>
<S>                                                                                         <C>
        6.2 Successors.......................................................................8
        6.3 Amendment of Prior Agreement.....................................................8

7. Discussions Concerning Future Investments.................................................8

        7.1 Future Additional Investments....................................................8
        7.2 Investments by Management........................................................8

8. Miscellaneous.............................................................................9

        8.1 Survival of Warranties...........................................................9
        8.2 Transfer; Successors and Assigns.................................................9
        8.3 Governing Law....................................................................9
        8.4 Counterparts.....................................................................9
        8.5 Titles and Subtitles.............................................................9
        8.6 Notices..........................................................................9
        8.7 Finder's Fee....................................................................10
        8.8 Attorney's Fees.................................................................10
        8.9 Amendments and Waivers..........................................................10
        8.10 Severability...................................................................10
        8.11 Delays or Omissions............................................................10
        8.12 Entire Agreement...............................................................11
        8.13 Nondisclosure Agreement........................................................11
        8.14 Corporate Securities Law.......................................................11
</TABLE>



                                      -ii-
<PAGE>   4


                          CATALYST SEMICONDUCTOR, INC.

                         COMMON STOCK PURCHASE AGREEMENT

        This COMMON STOCK PURCHASE AGREEMENT (this "AGREEMENT") is made as of
the 14th day of September 1998 by and between CATALYST SEMICONDUCTOR, INC., a
corporation organized and existing under the laws of the State of Delaware (the
"COMPANY"), and ELEX N.V., a corporation organized and existing under the laws
of the Country of Belgium ("PURCHASER").

        The parties hereby agree as follows:

        1.     PURCHASE AND SALE OF COMMON STOCK.

               1.1 FIRST SALE AND ISSUANCE OF COMMON STOCK. Subject to the terms
and conditions of this Agreement, Purchaser agrees to purchase at the First
Closing (as defined below) and the Company agrees to sell and issue to Purchaser
at the First Closing an aggregate of 4,000,000 shares of Common Stock at a
purchase price of US$0.25 per share. The shares of Common Stock issued to
Purchaser pursuant to this Section 1.1 shall be hereinafter referred to as the
"FIRST CLOSING STOCK."

               1.2 FIRST CLOSING; DELIVERY.

                      (a) The purchase and sale of the First Closing Stock shall
take place at the offices of Venture Law Group, 2800 Sand Hill Road, Menlo Park,
California, at 10:00 a.m., on September 14, 1998, or at such other time and
place as the Company and Purchaser mutually agree upon, orally or in writing
(which time and place are designated as the "FIRST CLOSING" and the date on
which the Closing occurs shall be the "FIRST CLOSING Date").

                      (b) At the Closing, the Company shall deliver to Purchaser
a certificate representing the First Closing Stock being purchased thereby
against payment of the purchase price therefor by check payable to the Company
or by wire transfer to the Company's bank account.

               1.3 SECOND SALE AND ISSUANCE OF COMMON STOCK. At any time during
the twelve (12) month period following the First Closing Date, the Company shall
have the right to require Purchaser to purchase up to an additional 4,000,000
shares of Common Stock of the Company. The Company may exercise such right by
giving Purchaser fifteen (15) days advance written notice (the "EXERCISE
NOTICE") of the Company's exercise of such right which Exercise Notice shall
specify (a) the number of shares to be purchased pursuant to this Section 1.3
(the "SECOND CLOSING STOCK"), (b) the aggregate purchase price, and (c) the
scheduled closing date for the purchase and sale of the Second Closing Stock,
which shall be no later than the 12-month anniversary of the First Closing Date.
Upon delivery of the Exercise Notice and subject to the terms and conditions of
this Agreement, Purchaser agrees to purchase at the Second Closing (as defined
below) and the Company agrees to sell and issue to Purchaser at the Second
Closing the 




<PAGE>   5

Second Closing Stock at a purchase price of US$0.25 per share. The First Closing
Stock and the Second Closing Stock shall collectively be referred to as the
"STOCK."

               1.4 SECOND CLOSING; DELIVERY.

                      (a) The purchase and sale of the Second Closing Stock
shall take place at the offices of Venture Law Group, 2800 Sand Hill Road, Menlo
Park, California, at 10:00 a.m., on the scheduled closing date specified in the
Exercise Notice pursuant to Section 1.3(c), or at such other time and place as
the Company and Purchaser mutually agree upon, orally or in writing (which time
and place are designated as the "SECOND CLOSING" and the date on which the
Closing occurs shall be the "SECOND CLOSING DATE").

                      (b) At the Second Closing, the Company shall deliver to
Purchaser a certificate representing the Second Closing Stock being purchased
thereby against payment of the purchase price therefor by check payable to the
Company or by wire transfer to the Company's bank account.

        2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company hereby
represents and warrants to Purchaser that, except as set forth on a Schedule of
Exceptions attached hereto as Exhibit A, which exceptions shall be deemed to be
representations and warranties as if made hereunder:

               2.1 ORGANIZATION, GOOD STANDING AND QUALIFICATION. The Company is
a corporation duly organized, validly existing and in good standing under the
laws of the State of Delaware and has all requisite corporate power and
authority to carry on its business. The Company is duly qualified to transact
business and is in good standing in each jurisdiction in which the failure so to
qualify would have a material adverse effect on its business or properties.

               2.2 CAPITALIZATION. The authorized capital of the Company
consists, or will consist, immediately prior to the Closing, of:

                      (a) 2,000,000 shares of Preferred Stock, none of which is
issued and outstanding.

                      (b) 25,000,000 shares of Common Stock, 9,961,722 shares of
which are issued and outstanding as of August 14, 1998. All of the outstanding
shares of Common Stock have been duly authorized, validly issued, fully paid and
are nonassessable and issued in compliance with all applicable federal and state
securities laws.

                      (c) Except for outstanding options, shares, rights or
other securities issued or granted pursuant to the Company's Stock Option Plan,
the Company's 1993 Directors Stock Option Plan, the Company's Employee Stock
Purchase Plan, the Company's Preferred Shares Rights Agreement dated as of
December 3, 1996 between the Company and First National Bank of Boston, as
Rights Agent (the "RIGHTS AGREEMENT"), and certain shares that the Company may
be required to issue to Trio-Tech in order to satisfy certain obligations to
such company, and except as provided in Section 7.2, there are no outstanding
options, warrants, 




                                      -2-
<PAGE>   6

rights (including conversion or preemptive rights and rights of first refusal or
similar rights) or agreements, orally or in writing, for the purchase or
acquisition from the Company of any shares of its capital stock.

               2.3 AUTHORIZATION. All corporate action on the part of the
Company, its officers, directors and stockholders necessary for the
authorization, execution and delivery of this Agreement, the Amended and
Restated Standstill Agreement in the form attached hereto as Exhibit B (the
"STANDSTILL AGREEMENT" and together with this Agreement, the "Agreements"), the
performance of all obligations of the Company hereunder and thereunder and, the
Agreements, when executed and delivered by the Company, shall constitute valid
and legally binding obligations of the Company, enforceable against the Company
in accordance with their terms except as limited by applicable bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance, and other laws of
general application affecting enforcement of creditors' rights generally, as
limited by laws relating to the availability of specific performance, injunctive
relief, or other equitable remedies.

               2.4 VALID ISSUANCE OF SECURITIES. The Stock that is being issued
to Purchaser hereunder, when issued, sold and delivered in accordance with the
terms hereof for the consideration expressed herein, will be duly and validly
issued, fully paid and nonassessable and free of restrictions on transfer other
than restrictions on transfer under this Agreement and the Standstill Agreement
and applicable state and federal securities laws. Based in part upon the
representations of Purchaser in this Agreement and subject to the provisions of
Section 2.5 below, the Stock will be issued in compliance with all applicable
federal and state securities laws.

               2.5 GOVERNMENTAL CONSENTS. No consent, approval, order or
authorization of, or registration, qualification, designation, declaration or
filing with, any federal, state or local governmental authority on the part of
the Company is required in connection with the consummation of the transactions
contemplated by this Agreement, except for filings pursuant to Section 25102(f)
of the California Corporate Securities Law of 1968, as amended, and the rules
thereunder, other applicable state securities laws and Regulation D of the
Securities Act of 1933, as amended (the "SECURITIES ACT").

               2.6 LITIGATION. There is no action, suit, proceeding or
investigation pending or, to the Company's knowledge, currently threatened
against the Company or any of its subsidiaries that questions the validity of
the Agreements or the right of the Company to enter into them, or to consummate
the transactions contemplated hereby or thereby, nor is the Company aware that
there is any basis for the foregoing. The Company is not a party or subject to
the provisions of any order, writ, injunction, judgment or decree of any court
or government agency or instrumentality.

               2.7 CORPORATE DOCUMENTS. The Restated Certificate of
Incorporation and Bylaws of the Company are in the form provided to Purchaser.

        3. REPRESENTATIONS AND WARRANTIES OF PURCHASER. Purchaser hereby
represents and warrants to the Company that:




                                      -3-
<PAGE>   7

               3.1 AUTHORIZATION; SHARE OWNERSHIP. Purchaser has full power and
authority to enter into the Agreements. The Agreements, when executed and
delivered by Purchaser, will constitute valid and legally binding obligations of
Purchaser, enforceable in accordance with their terms, except as limited by
applicable bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance, and any other laws of general application affecting enforcement of
creditors' rights generally, and as limited by laws relating to the availability
of a specific performance, injunctive relief, or other equitable remedies.
Purchaser does not, and immediately prior to the Closing will not, beneficially
own any outstanding shares of Common Stock of the Company

               3.2 PURCHASE ENTIRELY FOR OWN ACCOUNT. This Agreement is made
with Purchaser in reliance upon Purchaser's representation to the Company, which
by Purchaser's execution of this Agreement, Purchaser hereby confirms, that the
Stock to be acquired by Purchaser will be acquired for investment for
Purchaser's own account, not as a nominee or agent, and not with a view to the
resale or distribution of any part thereof, and that Purchaser has no present
intention of selling, granting any participation in, or otherwise distributing
the same. By executing this Agreement, Purchaser further represents that
Purchaser does not presently have any contract, undertaking, agreement or
arrangement with any person to sell, transfer or grant participations to such
person or to any third person, with respect to any of the Stock. Purchaser has
not been formed for the specific purpose of acquiring the Stock.

               3.3 DISCLOSURE OF INFORMATION. Purchaser has had an opportunity
to discuss the Company's business, management, financial affairs and the terms
and conditions of the offering of the Stock with the Company's current and past
Chief Executive Officers and other management and has had an opportunity to
review the Company's facilities, public filings (including the Company's Form
10-K for the fiscal year ended April 30, 1998) and all other materials requested
by Purchaser and believed by Purchaser to be material to its investment
decision. Purchaser understands that such discussions, as well as any other
written information delivered by the Company to Purchaser, were intended to
describe the aspects of the Company's business which it believes to be material.
Purchaser has had the ability and opportunity to discuss such matters with legal
and other advisors of its choosing.

               3.4 RESTRICTED SECURITIES. Purchaser understands that the Stock
has not been, and will not be, registered under the Securities Act, by reason of
a specific exemption from the registration provisions of the Securities Act
which depends upon, among other things, the bona fide nature of the investment
intent and the accuracy of Purchaser's representations as expressed herein.
Purchaser understands that the Stock constitutes "restricted securities" under
applicable U.S. federal and state securities laws and that, pursuant to these
laws, Purchaser must hold the Securities indefinitely unless they are registered
with the Securities and Exchange Commission and qualified by state authorities,
or an exemption from such registration and qualification requirements is
available. Purchaser acknowledges that the Company has no obligation to register
or qualify the Securities for resale. Purchaser further acknowledges that if an
exemption from registration or qualification is available, it may be conditioned
on various requirements including, but not limited to, the time and manner of
sale, the holding period for the Stock, and 




                                      -4-
<PAGE>   8

on requirements relating to the Company which are outside of Purchaser's
control, and which the Company is under no obligation and may not be able to
satisfy.

               3.5 NO PUBLIC MARKET. Purchaser understands that no public market
now exists for any of the securities issued by the Company, and that the Company
has made no assurances that a public market will ever exist for the Securities.

               3.6 LEGENDS. Purchaser understands that the Securities and any
securities issued in respect of or exchange for the Securities, may bear one or
all of the following legends:

                      (a) "THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT
        BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED
        FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE
        OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISTRIBUTION MAY BE EFFECTED
        WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN
        OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH
        REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933."

                      (b) "THE SALE, PLEDGE OR TRANSFER OF THE SECURITIES
        REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS AND CONDITIONS
        OF A CERTAIN COMMON STOCK PURCHASE AGREEMENT, AS AMENDED, BY AND BETWEEN
        THE SHAREHOLDER AND THE CORPORATION. COPIES OF SUCH AGREEMENT MAY BE
        OBTAINED UPON WRITTEN REQUEST TO THE SECRETARY OF THE CORPORATION."

                      (c) Any legend set forth in the other Standstill
Agreement.

                      (d) Any legend required by the Blue Sky laws of any state
or country to the extent such laws are applicable to the shares represented by
the certificate so legended.

               3.7 ACCREDITED INVESTOR; SOPHISTICATION. Purchaser is an
accredited investor as defined in Rule 501(a) of Regulation D promulgated under
the Securities Act. Purchaser has extensive experience with companies in the
industry conducted by the Company and is an experienced and sophisticated
investor with extensive experience investing in transactions similar to the
transactions contemplated by this Agreement.

               3.8 FOREIGN INVESTORS. If Purchaser is not a United States person
(as defined by Section 7701(a)(30) of the Internal Revenue Code of 1986, as
amended), Purchaser hereby represents that it has satisfied itself as to the
full observance of the laws of its jurisdiction in connection with any
invitation to subscribe for the Stock or any use of this Agreement, including
(i) the legal requirements within its jurisdiction for the purchase of the
Stock, (ii) any foreign exchange restrictions applicable to such purchase, (iii)
any governmental or other consents that may need to be obtained, and (iv) the
income tax and other tax consequences, if any, that may be 




                                      -5-
<PAGE>   9

relevant to the purchase, holding, redemption, sale, or transfer of the Stock.
Purchaser's subscription and payment for and continued beneficial ownership of
the Stock, will not violate any applicable securities or other laws of
Purchaser's jurisdiction.

        4. CONDITIONS OF PURCHASER'S OBLIGATIONS AT CLOSING. The obligations of
Purchaser to the Company under this Agreement are subject to the fulfillment, on
or before the Closing, of each of the following conditions, unless otherwise
waived:

               4.1 REPRESENTATIONS AND WARRANTIES. The representations and
warranties of the Company contained in Section 2 shall be true and correct in
all material respects on and as of the Closing with the same effect as though
such representations and warranties had been made on and as of the date of the
Closing.

               4.2 PERFORMANCE. The Company shall have performed and complied
with all covenants, agreements, obligations and conditions contained in this
Agreement that are required to be performed or complied with by it on or before
the Closing.

               4.3 COMPLIANCE CERTIFICATE. The President of the Company shall
deliver to Purchaser at the Closing a certificate certifying that the conditions
specified in Sections 4.1 and 4.2 have been fulfilled.

               4.4 QUALIFICATIONS. All authorizations, approvals or permits, if
any, of any governmental authority or regulatory body of the United States or of
any state (including the National Association of Securities Dealers, Inc. or the
National Market) that are required in connection with the lawful issuance and
sale of the Stock pursuant to this Agreement shall be obtained and effective as
of the Closing.

               4.5 AMENDMENT TO RIGHTS AGREEMENT. The Company shall have amended
its Rights Agreement, so that Purchaser will not be an "Acquiring Person" solely
by virtue of the transactions contemplated by this Agreement.

        5. CONDITIONS OF THE COMPANY'S OBLIGATIONS AT CLOSING. The obligations
of the Company to Purchaser under this Agreement are subject to the fulfillment,
on or before the Closing, of each of the following conditions, unless otherwise
waived:

               5.1 REPRESENTATIONS AND WARRANTIES. The representations and
warranties of Purchaser contained in Section 3 shall be true and correct in all
material respects on and as of the Closing with the same effect as though such
representations and warranties had been made on and as of the Closing.

               5.2 PERFORMANCE. All covenants, agreements and conditions
contained in this Agreement to be performed by Purchaser on or prior to the
Closing shall have been performed or complied with in all material respects.

               5.3 QUALIFICATIONS. All authorizations, approvals or permits, if
any, of any governmental authority or regulatory body of the United States or of
any state (including the 




                                      -6-
<PAGE>   10

National Association of Securities Dealers, Inc. or the National Market) that
are required in connection with the lawful issuance and sale of the Stock
pursuant to this Agreement shall be obtained and effective as of the Closing.

               5.4 STANDSTILL AGREEMENT. The Company and Purchaser shall have
executed and delivered the Standstill Agreement.

               5.5 AMENDMENT TO RIGHTS AGREEMENT. The Company shall have amended
its Rights Agreement so that Purchaser will not be an "Acquiring Person" solely
by virtue of the transactions contemplated by this Agreement and the Common
Stock Purchase Agreement dated as of May 26, 1998.

               5.6 FAIRNESS OPINION. The Company shall have obtained an opinion
of Sutter Securities or other financial advisors to the Company of recognized
standing, as to the fairness to the Company of the sale and issuance of the
Stock from a financial point of view.

        6.     REPURCHASE RIGHT.

               6.1 REPURCHASE RIGHT. Upon not less than fifteen (15) days
advance written notice (the "REPURCHASE NOTICE") delivered at any time or from
time to time prior to the one (1) year anniversary of the Closing Date, the
Company shall hereby have the assignable right to repurchase all or any portion
of the Stock. The repurchase price to be paid in exchange for the repurchase of
the Stock (the "REPURCHASE PRICE") shall be as follows: (a) if the Repurchase
Notice is delivered not later than the 3 month anniversary of the Closing Date,
the Repurchase Price shall be $1.25 per share; (b) if the Repurchase Notice is
delivered after the 3 month anniversary of the Closing Date but not later than
the 6 month anniversary of the Closing Date, the Repurchase Price shall be $1.50
per share; (c) if the Repurchase Notice is delivered after the 6 month
anniversary of the Closing Date but not later than the 9 month anniversary of
the Closing Date, the Repurchase Price shall be $1.75 per share; and (d) if the
Repurchase Notice is delivered after the 9 month anniversary of the Closing Date
but not later than the 12 month anniversary of the Closing Date, the Repurchase
Price shall be $2.00 per share. Notwithstanding the foregoing the Repurchase
Price shall in no event be less than the average of the closing bid price for
the Common Stock for the ten (10) trading days preceding the date of the
Repurchase Notice. The Repurchase Notice shall state that the demand for
repurchase is based on this Section of this Agreement and shall specify the date
of delivery of the Repurchase Notice, the number of shares to be repurchased,
and the price to be paid therefor. The Company and Elex hereby amend the third
sentence of Section 6.1 of that certain Common Stock Purchase Agreement dated as
of May 26, 1998 between the Company and Purchaser to provide as follows:
"Notwithstanding the foregoing the Repurchase Price shall in no event be less
than the average of the closing bid price for the Common Stock for the ten (10)
trading days preceding the date of the Repurchase Notice."

               6.2 SUCCESSORS. This Agreement shall be binding on any assignees
or transferees of Purchaser and Purchaser shall not sell, assign, pledge or
transfer the Stock unless such assignee or transferee executes an agreement
agreeing to be bound by the terms of this Agreement.




                                      -7-
<PAGE>   11

               6.3 AMENDMENT OF PRIOR AGREEMENT. The Company and Elex hereby
amend and restate the third sentence of Section 6.1 of that certain Common Stock
Purchase Agreement dated as of May 26, 1998 between the Company and Purchaser to
provide in its entirety as follows: "Notwithstanding the foregoing the
Repurchase Price shall in no event be less than the average of the closing bid
price for the Common Stock for the ten (10) trading days preceding the date of
the Repurchase Notice."

        7.     DISCUSSIONS CONCERNING FUTURE INVESTMENT; INVESTMENT BY 
               MANAGEMENT.

               7.1 FUTURE ADDITIONAL INVESTMENTS. In the event the Company is
going to file a voluntary petition in bankruptcy or an assignment for the
benefit of creditors, the Company shall notify Purchaser, shall discuss its
plans with Purchaser and shall discuss with Purchaser the possibility of
Purchaser investing additional equity in the Company. Such discussions will also
encompass the necessity to amend the Rights Agreement.

               7.2 INVESTMENTS BY MANAGEMENT. The Company will seek to sell to
certain of the members of management of the Company up to 4,500,000 shares of
the Company's Common Stock at a price of not less than $0.30 per share. The
payment for such shares shall be such consideration as shall be determined by
the Board of Directors of the Company which may be nonrecourse promissory notes
delivered by such individuals. In exchange for such members of management
maintaining below market salaries for a period of not less than three years, the
nonrecourse promissory notes will be forgiven in equal monthly, quarterly or
annual installments over a period of not less than three years.

        8.     MISCELLANEOUS.

               8.1 WARRANTIES. Unless otherwise set forth in this Agreement, the
representations, warranties and covenants of the Company and Purchaser contained
in or made pursuant to this Agreement shall not survive the Closing.

               8.2 TRANSFER; SUCCESSORS AND ASSIGNS. The terms and conditions of
this Agreement shall inure to the benefit of and be binding upon the respective
successors and assigns of the parties. Nothing in this Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Agreement, except as expressly provided
in this Agreement.

               8.3 GOVERNING LAW; JURISDICTION. This Agreement shall be governed
by and construed and enforced in accordance with the internal laws of the State
of California, and shall be binding upon the parties hereto in the United States
and worldwide. The federal and state courts within County of Santa Clara in the
State of California shall have exclusive jurisdiction to adjudicate any dispute
arising out of this Agreement.

               8.4 COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.




                                      -8-
<PAGE>   12

               8.5 TITLES AND SUBTITLES. The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

               8.6 NOTICES. Any notice required or permitted by this Agreement
shall be in writing and shall be deemed sufficient upon delivery, when delivered
personally or by overnight courier or sent by telegram or fax, or forty-eight
(48) hours after being deposited in the U.S. mail, as certified or registered
mail, with postage prepaid, addressed to the party to be notified at such
party's address as set forth below:

               (a)    If to Purchaser, to:

                      Elex N.V.
                      Transportstraat 1
                      B 3980
                      Tessenderlo, Belgium
                      Attention:    Chairman of the Board
                      Phone:        011+32 13 67 07 74
                      Fax:          011+32 13 67 21 34

               (b)    If to Catalyst, to:

                      Catalyst Semiconductor, Inc.
                      1250 Borregas Avenue
                      Sunnyvale, CA  94089

                      Attention:    President and Chief Executive Officer
                      Phone:        (408) 542-1060
                      Fax:          (408) 542-1406

               8.7 FINDER'S FEE. Each party represents that it neither is nor
will be obligated for any finder's fee or commission in connection with this
transaction. Purchaser agrees to indemnify and to hold harmless the Company from
any liability for any commission or compensation in the nature of a finder's fee
(and the costs and expenses of defending against such liability or asserted
liability) for which Purchaser or any of its officers, employees, or
representatives is responsible. The Company agrees to indemnify and hold
harmless Purchaser from any liability for any commission or compensation in the
nature of a finder's fee (and the costs and expenses of defending against such
liability or asserted liability) for which the Company or any of its officers,
employees or representatives is responsible.

               8.8 ATTORNEY'S FEES. If any action at law or in equity (including
arbitration) is necessary to enforce or interpret the terms of any of the
Agreements, the prevailing party shall be entitled to reasonable attorney's
fees, costs and necessary disbursements in addition to any other relief to which
such party may be entitled.




                                      -9-
<PAGE>   13

               8.9 AMENDMENTS AND WAIVERS. Any term of this Agreement may be
amended or waived only with the written consent of the Company and the holders
of at least a majority of the Stock. Any amendment or waiver effected in
accordance with this Section 7.9 shall be binding upon Purchaser and each
transferee of the Stock, each future holder of all such securities, and the
Company.

               8.10 SEVERABILITY. If one or more provisions of this Agreement
are held to be unenforceable under applicable law, the parties agree to
renegotiate such provision in good faith. In the event that the parties cannot
reach a mutually agreeable and enforceable replacement for such provision, then
(a) such provision shall be excluded from this Agreement, (b) the balance of the
Agreement shall be interpreted as if such provision were so excluded and (c) the
balance of the Agreement shall be enforceable in accordance with its terms.

               8.11 DELAYS OR OMISSIONS. No delay or omission to exercise any
right, power or remedy accruing to any party under this Agreement, upon any
breach or default of any other party under this Agreement, shall impair any such
right, power or remedy of such non-breaching or non-defaulting party nor shall
it be construed to be a waiver of any such breach or default, or an acquiescence
therein, or of or in any similar breach or default thereafter occurring; nor
shall any waiver of any single breach or default be deemed a waiver of any other
breach or default theretofore or thereafter occurring. Any waiver, permit,
consent or approval of any kind or character on the part of any party of any
breach or default under this Agreement, or any waiver on the part of any party
of any provisions or conditions of this Agreement, must be in writing and shall
be effective only to the extent specifically set forth in such writing. All
remedies, either under this Agreement or by law or otherwise afforded to any
party, shall be cumulative and not alternative.

               8.12 ENTIRE AGREEMENT. This Agreement, and the documents referred
to herein constitute the entire agreement between the parties hereto pertaining
to the subject matter hereof, and any and all other written or oral agreements
relating to the subject matter hereof existing between the parties hereto are
expressly canceled.

               8.13 NONDISCLOSURE AGREEMENT. The parties reaffirm and
acknowledge the terms and conditions of that certain Nondisclosure Agreement
dated as of May 26, 1998.

               8.14 CORPORATE SECURITIES LAW. THE SALE OF THE SECURITIES WHICH
ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE COMMISSIONER
OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE SECURITIES OR
THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO THE
QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM THE
QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA CORPORATIONS
CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON
THE QUALIFICATION BEING OBTAINED UNLESS THE SALE IS SO EXEMPT.

                  [Remainder of Page Intentionally Left Blank]



                                      -10-
<PAGE>   14


        The parties have executed this Common Stock Purchase Agreement as of the
date first written above.

COMPANY:
                                  CATALYST SEMICONDUCTOR, INC.


                                  By:  /s/ Radu Vanco
                                      ------------------------------------
                                        Radu Vanco
                                        President and Chief Executive Officer


PURCHASER:
                                  ELEX N.V.


                                  By:   /s/ Roland Duchatelet
                                      ------------------------------------
                                        Roland Duchatelet
                                        Chairman of the Board



                      SIGNATURE PAGE TO PURCHASE AGREEMENT

<PAGE>   15

                                    EXHIBIT A


            SCHEDULE OF EXCEPTIONS TO REPRESENTATIONS AND WARRANTIES


        This Schedule of Exceptions is made and given pursuant to Section 2 of
the Common Stock Purchase Agreement dated as of September 14, 1998 (the
"AGREEMENT") between Catalyst Semiconductor, Inc., a corporation organized and
existing under the laws of the State of Delaware (the "COMPANY"), and Elex N.V.,
a corporation organized and existing under the laws of the Country of Belgium
("PURCHASER"). Unless the context otherwise requires, all capitalized terms used
herein shall have the same meanings as set forth in the Agreement. All
disclosures and exceptions contained herein are intended to modify all of the
Company's representations and warranties contained in the Agreement, and the
section headings used below are for convenience only.

        NONE.




                                      -1-


<PAGE>   1


                              AMENDED AND RESTATED

                              STANDSTILL AGREEMENT


        This AMENDED AND RESTATED STANDSTILL AGREEMENT is made as of September
14, 1998 by and between CATALYST SEMICONDUCTOR, INC., a corporation organized
and existing under the laws of the State of Delaware (the "CATALYST"), and ELEX
N.V., a corporation organized and existing under the laws of the Country of
Belgium ("PURCHASER"). This Agreement amends and restates that certain
Standstill Agreement dated as of May 26, 1998 (the "PRIOR AGREEMENT") between
the Company and Purchaser.

                                 R E C I T A L S

        In connection with negotiations relating to the proposed issuance by
Catalyst and purchase by Purchaser of shares of Catalyst's Common Stock,
Purchaser and the Company wish to amend and restate the Prior Agreement such
that Purchaser makes certain covenants to Catalyst so as to provide limits on
Purchaser's ownership of and voting of the Company's capital stock of Catalyst.

        NOW, THEREFORE, in consideration of the foregoing and the mutual
promises herein contained, the parties agree as follows:

                                A G R E E M E N T

        1. Certain Definitions. Unless the context otherwise requires, the
following terms, for all purposes of this Agreement, shall have the meanings
specified in this Section 1:

        "AFFILIATE" of any Person shall mean: (i) any entity which owns fifty
percent (50%) or more of such Person's Outstanding Voting Stock or which has the
power to appoint or elect a majority of the Board of Directors of such Person;
(ii) any entity in which such Person owns fifty percent (50%) or more of such
entity's Outstanding Voting Stock or for which such Person has the power to
appoint or elect a majority of the Board of Directors of such entity; (iii) any
entity having a common stockholder with such Person wherein such stockholder
owns fifty percent (50%) or more of such entity's Outstanding Voting Stock and
has the power to appoint a majority of the Board of Directors of such Person;
(iv) any entity having a common stockholder with such Person wherein such
stockholder owns fifty percent (50%) or more of such Person's Outstanding Voting
Stock and has the power to appoint a majority of the Board of Directors of such
entity; or (v) any entity having a common stockholder with such Person wherein
such stockholder has the power to appoint a majority of the Board of Directors
of such Person and such entity.




<PAGE>   2

        "OUTSTANDING VOTING STOCK" of Catalyst, or another entity as the context
requires, shall mean the Common Stock of Catalyst (or such other entity) and any
other securities convertible into Common Stock of Catalyst (or such other
entity) having the power to vote in the election of directors of Catalyst (or
such other entity) then outstanding, other than securities having such power
only upon the happening of a contingency which has not yet occurred.

        "PERSON" shall mean any individual, partnership, joint venture,
corporation, trust or unincorporated organization, or any business entity or
governmental authority, in any case whether acting in an individual, fiduciary
or other capacity

        "VOTING POWER" shall mean the number of votes entitled to then be cast
by the Outstanding Voting Stock of Catalyst at any election of directors of
Catalyst, provided that, for the purpose of determining Voting Power, each share
of Preferred Stock of Catalyst, if any (the "PREFERRED STOCK"), shall be deemed
to be entitled to the number of votes equal to the number of shares of Common
Stock of Catalyst (the "COMMON STOCK") into which such share of Preferred Stock
could then be converted.

        "VOTING STOCK" shall mean the Common Stock outstanding, assuming the
exercise or conversion of all outstanding securities convertible into or
exercisable or exchangeable for Common Stock and further assuming the issuance
of all shares of Common Stock reserved for issuance pursuant to stock options
whether or not yet granted, and any other securities issued by Catalyst having
the power to vote in the election of directors of Catalyst, other than
securities having such power only upon the happening of a contingency which has
not yet occurred.

        2.     Covenants of Purchaser.

               2.1. Standstill Provisions. Purchaser shall not (and shall not
permit any Affiliate to), directly or indirectly,

                      (a) acquire from other holders of Voting Stock or other
securities convertible into or exchangeable or exercisable for Voting Stock,
beneficial ownership of any Voting Stock, any securities convertible into or
exchangeable for Voting Stock, or any other right to acquire Voting Stock
(except, in any case, by way of stock dividends, stock splits or other
distributions made to holders of any Voting Stock generally), or authorize or
make a tender, exchange or other offer which would result in such an
acquisition, without the prior written consent of Catalyst approved by the Board
of Directors of Catalyst, if the effect of such acquisition would be to increase
the Voting Power of all Voting Stock then beneficially owned by Purchaser (and
its Affiliates), or which Purchaser (and its Affiliates) collectively have a
right to acquire, to more than 5,500,000 shares (as appropriately adjusted for
stock dividends, stock splits, recapitalizations, reclassifications and the
like) or, following the Second Closing contemplated by the Common Stock Purchase
Agreement dated as of September 14, 1998 between the Company and Purchaser, to
more than 9,500,000 shares (as appropriately adjusted for stock dividends, stock
splits, recapitalizations, reclassifications and the like);

                      (b) deposit any shares of Voting Stock in a voting trust
or subject any Voting Stock to any arrangement or agreement with respect to the
voting of such Voting Stock;




                                      -2-
<PAGE>   3


                      (c) otherwise act to seek to control the management, Board
of Directors, or policies of Catalyst (or any of its Affiliates), or, except as
required by law, make public statements with respect thereto;

                      (d) solicit, or induce others to solicit, "proxies" to
vote with respect to any securities issued by Catalyst or any of its Affiliates,
or become a "participant" or induce others to become a "participant" in any
solicitation of "proxies" to vote (as such terms are used in Regulation 14A
under the Securities Exchange Act of 1934) securities issued by Catalyst (or any
of its Affiliates) or seek to advise or influence any Person with respect to the
voting of securities issued by Catalyst (or its Affiliates); or

                      (e) otherwise act in any manner, whether by forming,
joining or participating with any Person or group, or aiding, advising,
encouraging or assisting any other Person or group, whether for the purpose of
acquiring, holding, voting or disposing of Voting Stock or accomplishing any of
the foregoing (a) through (d) above,, including inviting, encouraging,
soliciting or providing information to assist the submission of any proposal for
the acquisition, by purchase or otherwise, from Catalyst (or any of its
Affiliates) or any other Person of securities issued by Catalyst (or any of its
Affiliates) or assets of Catalyst (or any of its Affiliates) or any proposal
with respect to any form of restructuring, recapitalization or similar
transaction of Catalyst (or any of its Affiliates).

               2.2. Notice of Purchases. Purchaser shall notify Catalyst in
writing as to Purchaser's (or any Affiliate's) acquisition of additional shares
of Voting Stock, or rights thereto within a reasonable time period not to exceed
ten (10) days after such acquisition.

               2.3 Transferees. Purchaser shall not sell, assign or transfer in
excess of one hundred thousand (100,000) Common Shares to any other party (or
any Affiliate of such party) in a transaction or a series of related
transactions without such other party which purchases such shares having agreed
to and having become a party to this Agreement with the Company.

        3. Voting of Stock. Purchaser (a) will execute all "proxies" solicited
by management or the Board of Directors of Catalyst or (b) will vote all Voting
Stock "FOR" all proposals submitted by Management or the Board of Directors of
Catalyst, for approval or a vote by the shareholders of Catalyst, including all
nominations for the Board of Directors of Catalyst.

        4. Prohibited Transfer. Any purchase which causes Purchaser to be in
violation of the terms of Section 2 above ("PROHIBITED TRANSFER") shall not be
effected by Catalyst and shall be voidable at the option of Catalyst by their
giving written notice to the transferor, his transferee and Purchaser. Each
certificate representing Common Shares held by Purchaser shall be endorsed by
the Company with a legend reading as follows:

        "THE SHARES EVIDENCED HEREBY ARE SUBJECT TO A STANDSTILL AGREEMENT BY
        AND BETWEEN THE COMPANY AND THE HOLDER HEREOF (A COPY OF WHICH MAY BE
        OBTAINED FROM THE COMPANY), AND NO TRANSFER OF THE SHARES EVIDENCED




                                      -3-
<PAGE>   4

        HEREBY SHALL BE EFFECTIVE EXCEPT IN COMPLIANCE WITH THE TERMS THEREOF."

        5.     Miscellaneous.

               5.1. Governing Law; Jurisdiction. This Agreement shall be
governed by and construed and enforced in accordance with the internal laws of
the State of Delaware, and shall be binding upon the parties hereto in the
United States and worldwide. The federal and state courts within County of Santa
Clara in the State of California shall have exclusive jurisdiction to adjudicate
any dispute arising out of this Agreement.

               5.2. Successors and Assigns. Except as otherwise expressly
provided herein, the provisions hereof shall inure to the benefit of, and be
binding upon, the successor and assigns of the parties hereto.

               5.3. Entire Agreement; Amendment. This Agreement constitutes the
full and entire understanding and agreement between the parties with regard to
the subjects hereof and thereof. Neither this Agreement nor any provision hereof
may be amended, changed, waived, discharged or terminated other than by a
written instrument signed by the party against who enforcement of any such
amendment, change, waiver, discharge or termination is sought. Any amendment or
waiver effected in accordance with this section shall be binding upon each
holder of any securities purchased under this Agreement at the time outstanding
(including securities into which such securities have been converted), each
future holder of all such securities and Catalyst.

               5.4. Notices, etc. All notices and other communications required
or permitted hereunder shall be effective upon receipt and shall be in writing
and may be delivered in person, by telecopy, electronic mail, express delivery
service or U.S. mail, in which event it may be mailed by first-class, certified
or registered, postage prepaid, addressed, to the party to be notified, at the
respective addresses set forth below, or at such other address which may
hereinafter be designated in writing:

                      (a)    If to Purchaser, to:

                             Elex N.V.
                             Transportstraat 1
                             B 3980
                             Tessenderlo, Belgium
                             Belgium
                             Attention:     Chairman of the Board
                             Phone:         011+32 57 22 61 31
                             Fax:           011+32 13 67 21 34

                      (b)    If to Catalyst, to:

                             Catalyst Semiconductor, Inc.




                                      -4-
<PAGE>   5

                             1250 Borregas Avenue
                             Sunnyvale, CA  94089
                             Attention:   President and Chief Executive Officer
                             Phone:       (408) 542-1060
                             Fax:         (408) 542-1406


               5.5. Severability. If any provision of this Agreement shall be
judicially determined to be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby.

               5.6. Titles and Subtitles. The titles of the Articles and
Sections of this Agreement are for convenience of reference only and in no way
define, limit, extend, or describe the scope of this Agreement or the intent of
any of its provisions.

               5.7. Counterparts. This Agreement may be executed in any number
of counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

               5.8. Delays or Omissions. It is agreed that no delay or omission
to exercise any right, power or remedy accruing to any party upon any breach or
default of any other party under this Agreement shall impair any such right,
power or remedy, nor shall it be construed to be a waiver of any such breach or
default, or any acquiescence therein, or of any similar breach or default
thereafter occurring; nor shall any waiver of any single breach or default be
deemed a waiver of any other breach or default theretofore or thereafter
occurring. It is further agreed that any waiver, permit, consent or approval of
any kind or character of any breach or default under this Agreement, or any
waiver of any provisions or conditions of this Agreement must be in writing and
shall be effective only to the extent specifically set forth in writing, and
that all remedies, either under this Agreement, by law or otherwise, shall be
cumulative and not alternative.

               5.9. Consents. Any permission, consent, or approval of any kind
or character under this Agreement shall be in writing or detrimentally relied
upon and proved by clear and convincing evidence (other than alleged reliance)
and shall be effective only to the extent specifically set forth in such writing
or proved.

               5.10. Payment of Fees and Expenses. Each party shall be
responsible for paying its own fees, costs and expenses in connection with this
Agreement and the transactions herein contemplated.

               5.11. Construction of Agreement. No provision of this Agreement
shall be construed against either party as the drafter thereof.

               5.12. Section References. Unless otherwise stated, any reference
contained herein to a Section or subsection refers to the provisions of this
Agreement.




                                      -5-
<PAGE>   6

               5.13. Variations of Pronouns. All pronouns and all variations
thereof shall be deemed to refer to the masculine, feminine, or neuter, singular
or plural, as the context in which they are used may require.

                  [Remainder of Page Intentionally Left Blank]




                                      -6-
<PAGE>   7

        IN WITNESS WHEREOF, the parties have caused this Standstill Agreement to
be duly executed and delivered by their proper and duly authorized officers as
of the day and year first written above.

                                    CATALYST SEMICONDUCTOR, INC.


                                    By:  /s/ Radu Vanco
                                        -----------------------------------
                                          Radu Vanco
                                          President and Chief Executive Officer

                                    ELEX N.V.


                                    By:   /s/ Roland Duchatelet
                                        -----------------------------------
                                          Roland Duchatelet
                                          Chairman of the Board




                                      -1-



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