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Option Agreement - Oak Technology Inc. and Taiwan Semiconductor Manufacturing Inc.

                               OPTION AGREEMENT


                              OAK TECHNOLOGY, INC.



                                 AUGUST 8, 1996

                                OPTION AGREEMENT

     THIS AGREEMENT is made and becomes effective as of AUGUST 8, 1996 (the 
"Effective Date") by Taiwan Semiconductor Co., Ltd. ("TSMC"), a company 
organized under the laws of the Republic of China with its registered address 
at No. 121, Park Ave. 3, Science-Based Industrial Park, Hsinchu, Taiwan, and 
OAK Technology, Inc., a company organized under the laws of the R.O.C., with 
its registered address at Rm. B, 7F, No. 370, Sec. 1, Fu-Hsing S. Rd. Taipei, 
Taiwan, R.O.C. ("Customer").


     WHEREAS, TSMC currently supplies Customer with wafers and Customer 
wishes to increase the purchase volume of wafers from TSMC;

     WHEREAS, in order to increase its output, TSMC must accelerate its ramp 
up in Fab 3 and advance the start of Fab 4;

     WHEREAS, as a condition to TSMC's acceleration of these facilities, TSMC 
has asked Customer to make a capacity commitment and certain advance payment 
under three option agreements;



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

1.  [*                                    ]



[*] Confidential Treatment Requested




    (a)  "Base Capacity" used in this Agreement shall mean the capacity that 
         TSMC agrees to provide, and of which Customer agrees to purchase 90%, 
         in addition to the Option Capacity, pursuant to this Agreement.

    (b)  "Customer Committed Capacity" used in this Agreement shall mean the 
         total capacity that Customer agrees to purchase from TSMC pursuant to 
         this Agreement, and is set forth in Exhibit B.

    (c)  "Option Capacity" used in this Agreement shall mean the firm 
         capacity commitment made by Customer pursuant to this Agreement, for 
         which capacity Customer agrees to pay TSMC liquidated damages at a 
         rate [*                           ] for any such unused capacity 
         pursuant to Section 6(a) below.

    (d)  "Option Fee" used in this Agreement shall mean Customer's deposit 
         balance, [*            *] at TSMC upon the execution hereof as partial
         prepayment of the Option Capacity to be purchased by Customer, and 
         for liquidated damages upon Customer's failure to purchase the Option 
         Capacity. Except for the return of the corresponding Option Fee under 
         assignment pursuant to Section 6(a), the Option Fee is not refundable.

    (e)  "TSMC Committed Capacity" used in this Agreement shall mean the 
         total capacity that TSMC agrees to provide to Customer pursuant to this
         Agreement, and is set forth in Exhibit B.

    (f)  "Wafer Equivalent" used in this Agreement shall mean the number of 
         6" or 8" wafers based on the equivalency factor for 1995 Base Capacity.
         For details of the equivalency factor, please refer to Exhibit A. Any 
         and all the capacity commitments referred to in this Agreement shall be
         measured in Wafer Equivalent.

[*] Confidential Treatment Requested


    (a)  Customer agrees to purchase from TSMC the Customer Committed 
         Capacity, and TSMC agrees to provide to Customer the TSMC Committed 
         Capacity, as set forth in Exhibit B. In any calendar year, the orders 
         placed by Customer shall first apply to fulfill 90% of the Base 
         Capacity portion, and then the Option Capacity.

    (b)  Each month, Customer agrees to provide to TSMC a six-month rolling 
         forecast of the number of wafers that Customer will purchase, with the 
         volume for the first twelve weeks being frozen (i.e. Customer must 
         purchase all of the quantity  forecast for the delivery in the first 
         twelve weeks of all forecast). The forecast must be based on wafers out
         or deliveries expected to be made by TSMC.

    (c)  TSMC will use its reasonable effort to cause its fabs to be capable 
         of producing wafers of more advanced specifications, as set forth in 
         the TSMC Technology Road Map attached in Exhibit C.



                       ] Customer has the right to conduct price audit once 
         a year on wafer price for the preceding twelve months through an 
         internationally renown accounting firm, with a one-month prior written 
         notice to TSMC. In the event that the wafer prices for the Option 
         Capacity do not comply with this paragraph, TSMC will credit Customer 
         any difference between the actual wafer prices paid and the Average 
         Wafer Prices determined during the audits. TSMC will credit against 
         Customer [*          ] Wafer Equivalent for the Option Capacity 
         purchased in the year 1996 and [*           ] Wafer Equivalent for the
         Option Capacity in the years 1997, 1998 and 1999.

    (b)  The parties shall negotiate in good faith each month the wafer prices 
         for the Option Capacity ordered for the following month, and of no 
         agreement may

[*] Confidential Treatment Requested

         be reached by the parties before the end of each month, the parties 
         agree to apply the wafer price used in that month to any orders placed 
         by Customer in the subsequent month, and submit the dispute to the 
         binding arbitration pursuant to Section 12 below to decide the wafer 
         price within two months upon submission. Under such circumstances, 
         neither party shall have the right to terminate this Agreement under 
         Section 7 below.


    The Customer/TSMC Indemnity Agreement dated October 26, 1996 will apply 
    to all purchases of wafers by Customer from TSMC, except that the provisions
    of this Agreement will supersede the above Agreement with respect to the 
    subject matter hereof. Within ninety (90) days upon execution hereof, both 
    parties agree to use their best efforts to negotiate and enter into a wafer 
    production agreement for the purchase of wafers hereunder.


   (a)  Provided for the year 1996, if in any calendar year, for any reason, 
        Customer is not able to use or purchase all or a portion of the Customer
        Committed Capacity of that year, or any other year(s) during the term 
        of this Agreement, Customer shall promptly notify TSMC of such in 
        writing and first offer TSMC such Capacity for sales to any third 
        parties. In addition to its right to terminate this Agreement under 
        Section 7(b) below, TSMC may, at its option, accept such offer, in whole
        or in part, within thirty (30) days following Customer's notification. 
        In the event that TSMC decides not to accept such offer, Customer may 
        assign such unused Customer Committed Capacity for that calendar year or
        this Agreement (including the right to purchase the Customer Committed 
        Capacity for the remaining term of this Agreement) to any third parties 
        acceptable to TSMC, within two months upon TSMC's written notice that it
        will not accept such offer, and if Customer fails to do so, TSMC has the
        right to deduct from the Option Fee [*                               ]
        times the unused Option Capacity for the applicable year as liquidated 
        damages, and TSMC is entitled to sell or use any unused capacity 
        thereafter. Any unused

[*] Confidential Treatment Requested

        Customer Committed Capacity for 1996 shall be carried forward to the 
        year 1997 and counted as additional Option Capacity for 1997.

   (b)  If any portion of this Agreement or the whole Agreement is assigned 
        to any third parties acceptable to TSMC pursuant to this Section 6(a) 
        above, Customer shall cause such third parties to abide by the terms 
        and conditions of this Agreement, and TSMC will return to Customer the 
        portion of the Option Fee corresponding to the assigned Option Capacity 
        at the same rates as set forth in Section 4(a).


   (a)  The term of this Agreement shall commence from the Effective Date, 
        and continue until December 31, 1999, or the date of total consumption 
        of the Option Fee pursuant to this Agreement, whichever is earlier.

        Either party may terminate this Agreement if the other party breaches 
        any material provisions of this Agreement and does not cure or remedy 
        such breach within ninety (90) days of receiving written notice of such 
        breach, or becomes the subject of a voluntary or involuntary petition in
        bankruptcy or any proceeding relating to insolvency, receivership or 
        liquidation, if such petition or proceeding is not dismissed with 
        prejudice within sixty (60) days after filing.

        Both parties shall remain liable to the other party for any outstanding 
        and matured rights and obligations at the time of termination.


    In no event shall either party be liable for any indirect, special, 
    incidental or consequential damages (including loss of profits and loss of 
    use) resulting from, arising out of or in connection with the performance or
    failure to perform under this Agreement, or resulting from, arising out of 
    or in connection with TSMC's

    producing, supplying, and/or sale of the wafers, whether due to a breach 
    of contract, breach of warranty, tort, or negligence of TSMC, or otherwise.


    All notices required or permitted to be sent by either party to the other 
    party under this Agreement shall be sent by registered mail postage prepaid,
    or by personal delivery, or by fax. Any notice given by fax shall be 
    followed by a confirmation copy within ten (10) days. Unless changed by 
    written notice given by either party to the other, the addresses and fax 
    numbers of the respective parties shall be as follows:

    To TSMC:
         No. 121, Park Avenue 3
         Science-Based Industrial Park
         Hsinchu, Taiwan
         Republic of China

    To Customer:
         OAK Technology, Inc.
         Rm. B, 7F, No. 370
         Sec. 1, Fu-Hsing S. Rd.
         Taipei, Taiwan
         Republic of China


    This Agreement, including Exhibits A-C, constitutes the entire agreement 
    between the parties with respect to the subject matter hereof, and 
    supersedes and replaces all prior or contemporaneous understanding, 
    agreements, dealings and negotiations, oral or written, regarding the 
    subject matter hereof. No modification, alteration or amendment of this 
    Agreement shall be effective unless in writing and signed by both parties. 
    No waiver of any breach or failure by either party to enforce any provision 
    of this Agreement shall be deemed a waiver

    of any other or subsequent breach, or a waiver of future enforcement of 
    that or any other provision.


    This Agreement will be governed by and interpreted in accordance with the 
    laws of the Republic of China.


    Each party will make the best efforts to resolve amicably any disputes or 
    claims under this Agreement among the parties. In the event that a 
    resolution is not reached among the parties within thirty (30) days after 
    written notice by any party of the dispute or claim, the dispute or claim 
    shall be finally settled by binding arbitration in Taipei under the Rules 
    of the ROC Commercial Arbitration Act by three (3) arbitrators appointed 
    in accordance with such rules. The arbitration proceeding shall be conducted
    in English. Judgment on the award rendered by the arbitrator may be entered
    in any court having jurisdiction thereof.


    This Agreement shall be binding on and inure to the benefit of each party 
    and its successors, and except that Customer may assign this Agreement under
    Section 6 above, neither party shall assign any of its rights hereunder, nor
    delegate its obligations hereunder, to any third party, without the prior 
    written consent of the other.


    Both parties shall keep in strict confidence the existence or contents 
    of this Agreement and take the best precaution possible to prevent any 
    unauthorized disclosure or use thereof. Both parties agree that no 
    disclosure of this Agreement or any matter relating thereto may be made 
    without the disclosing party first providing the proposed disclosure to the 
    other party two weeks in advance for consent. In the event disclosure is 
    required by laws or governmental regulations.

    the disclosing party shall provide the other party the opportunity to 
    protest, participate in preparing disclosure or make reasonable changes 


    Customer shall use TSMC as the primary foundry source to manufacture all of
    its products provided that TSMC offers competitive pricing, delivery and 


    Neither party shall be responsible for delays or failure in performance 
    resulting from acts beyond the reasonable control of such party. Such acts 
    shall include but not limited to acts of God, war, riot, labor stoppages, 
    governmental actions, fires, floods, and earthquakes.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of 
the date first stated above.

TAIWAN SEMICONDUCTOR                   OAK Technology, Inc.
MANUFACTURING CO., LTD.                                    

BY: /s/ KL FOR DON BROOKS              BY: /s/ DAVID D. TSANG
    ---------------------                  ------------------

    Donald W. Brooks                   David Tsang

    President                          President

                                   Exhibit A

                    [                  *                  ]

[*] Confidential Treatment Requested

                                   Exhibit B

                    [                  *                  ]

[*] Confidential Treatment Requested

                                   Exhibit C

                    [                  *                  ]

[*] Confidential Treatment Requested

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