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                                                                   EXHIBIT 10.18

[LOGO APPEARS HERE]
                       Centillium technology Corporation

                      "Expanding Communication Bandwidth"

November 30, 1999

Mr. John W. Luhtala
224 Monterey Street
Santa Cruz, CA 95060

Dear John:

On Behalf of Centillium Communications, Inc., (the "Company"), I am pleased to
offer you the position of Vice President and Chief Financial Officer. You will
be reporting to A. Travis White, President and CEO of the Company.

You will be paid a salary of $154,000 (One hundred fifty four thousand dollars)
annually. Your base salary will be payable in accordance with the Company's
standard payroll policies (subject to normal required withholding). A sign-on
bonus will be granted in the amount of $25,000 gross, payable after thirty days
of employment. If you voluntarily leave the organization before one year of
continuous service, you will be required to pay back this bonus, in full. You
will accrue 3.69 hours vacation/ personal time per pay period, totaling twelve
days paid vacation annually. Your salary will be paid on a bi-weekly basis. All
company benefits begin on the 1/st/ day of the following month from your
employment date.

It will be recommended to the Centillium Communications, Inc. Board of Directors
that you be eligible to participate in the Centillium Communications, Inc. Stock
Option Program. Subject to this approval, you will be granted an option to
purchase 175,000 (One hundred seventy five thousand) shares of the Company's
Common Stock at an exercise price equal to the fair market value of the Company
Common Stock on the date of grant as determined by the Centillium
Communications, Inc. Board of Directors.

If Centillium Communications is acquired, merged, or significant change of
control occurs which impacts your job responsibilities is one of the following
ways, you and the company agree that your stock options would be accelerated by
one full year.
     .    Job elimination or if you are asked to leave the organization
     .    Job responsibilities were significantly reduced, changed or altered
     .    Forced to move to an unacceptable location

This acceleration of the vesting provision will be contained in your stock
option agreement.

Under rule 83(b) you will be eligible to exercise unvested options. This enables
you to recognize long term capital gains or losses and begins the process of the
one-year holding period. You should note that under certain circumstances, you
might be required to recognize income for income tax purposes upon exercising
options. Please consult your tax advisor, prior to exercising vested and
unvested options. Should you terminate your relationship with Centillium
<PAGE>

John Luhtala
Page Two

Communications, the Company has the irrevocable, exclusive option for a period
of ninety (90) days from such date, to repurchase up to that number of shares
which are unvested, at the original purchase price per share.

Your offer is contingent upon your agreement that you will not, during and after
your employment with Centillium Communications, Inc., improper use or disclose
proprietary information or trade secrets of any former or concurrent employer or
other person or entity, and that you will not bring onto the premises of
Centillium Communications, Inc., any unpublished document or proprietary
information belonging to any such employer, person, or entity, unless consented
to in writing by such employer, person, or entity.

Your acceptance of this offer represents the sole agreement between you and
Centillium Communications, Inc., no prior promises, representations or
understandings relative to any terms or conditions of your employment are to be
considered as part of this agreement unless expressed in writing in this letter.
Centillium Communications is an "at-will" employer which means that this
employment relationship may be terminated at any time, with or without good
cause or for any or no cause, at the option either of the Company or employee,
with or without notice.

This offer is contingent upon reference checks and is valid for four days from
the date of this letter, unless any other arrangements are made. Please indicate
your acceptance and start date by signing and returning the enclosed copy of
this letter.

Sincerely,

/s/ Travis White

A.  Travis White
President and CEO

                              The foregoing terms and conditions are hereby
                              accepted:

                              Start Date:  12/8/99
                                         -----------------------

                              Signed:  /s/ John Luhtala
                                     ---------------------------
                                       John Luhtala

                              Date:    11/30/99
                                    ----------------------------<PAGE>

                                                                   EXHIBIT 10.19
[LOGO]
                       Centillium Technology Corporation

                      "Expanding Communication Bandwidth"

Revised Offer Letter of August 5, 1999
--------------------------------------

August 17, 1999

Mr. Jon Sherburne
12443 De Sanka Avenue
Saratoga, CA 95070

Dear Jon:

On behalf of Centillium Technology Corporation, (the "Company"), I am pleased to
offer you the position of Vice President Sales.  You will be reporting A. Travis
White, President and CEO of the Company:

The following components make up your salary structure during fiscal year 1999:

     .    Base salary:     $140,000.00
     .    Commission:      $40,000.00, paid quarterly based on achieving 100%
          of plan. Commission will be capped at 25% over plan.
     .    MBO's (5):       $20,000.00, paid annually.
     .    Sign on Bonus:   $10,000.00, will be paid after thirty days of
          employment. If you leave the organization before one year of
          continuous service, you will be required to pay back the bonus, in
          full.
Your base salary will be payable in accordance with the Company's standard
payroll policies (subject to normal required withholding). You will accrue 3.69
hours vacation/personal time per pay period, totaling twelve days paid vacation
annually. Your salary will be paid on a bi-weekly basis. All company benefits
begin on the 1/st/ day of the following month from your employment date.

It will be recommended to the Centillium Technology Corporation Board of
Directors that you be eligible to participate in the Centillium Technology
Corporation Stock Option Program.  Subject to this approval, you will be granted
an option to purchase 215,000 (Two hundred fifteen thousand) shares of the
company's Common Stock at an exercise price equal to the fair market value of
the Company Common Stock on the date of grant as determined by the Centillium
Technology Corporation Board of Directors.

Based on performance in relation to production from two specific accounts, I
will recommend to the Board of Directors that you be granted an additional
10,000 (Ten thousand) shares of stock at or within one year from your date of
employment.  All shares will be subject to the standard four-year vesting
schedule with the one-year cliff, per our stock option agreement.

If Centillium Technology is acquired, merged, or a significant change of control
occurs which impacts your job responsibilities in one of the following ways, you
and the Company agree that your stock options would be accelerated by one full
year.

     .    Job elimination or if you are asked to leave the organization
     .    Job responsibilities were significantly reduced, changed or altered
     .    Forced to move to an unacceptable location

This acceleration of the vesting provision will be contained in your stock
option agreement.
<PAGE>

Under rule 83(b) you will be eligible to exercise unvested options. This
enables you to recognize long term capital gains or losses and begins the
process of the one-year holding period. You should note that under certain
circumstances, you might be required to recognize the income tax purposes upon
exercising options. Please consult your tax advisor, prior to exercising vested
and unvested options. Should you terminate your relationship with Centillium
Technology, the Company has the irrevocable, exclusive option for a period of
ninety (90) days from such date, to repurchase up to that number of shares which
are unvested, at the original purchase price per share.

Centillium Technology agrees to loan you the money to exercise your unvested
stock options (Rule 83b), after the Board of Director's has approved your stock
option grant. The loan shall bear an interest rate of six percent (6%),
compounded annually. In connection with exercising any unvested options, you
will be required to execute and deliver Centillium's standard early exercise
agreements. The conditions regarding the repayment of the loan are as follows.

     .    When Centillium Technology goes public or if you are to leave the
          company, the loan will be repaid in full and any accrued interest
          thereon.
     .    Prior to selling any shares, you will be responsible for paying the
          applicable portion of the loan and any accrued interest thereon.

Your offer is contingent upon your agreement that you will not, during and after
your employment with Centillium Technology Corporation, improperly use or
disclose proprietary information or trade secrets of any former or concurrent
employer or other person or entity, and that you will not bring onto the
premises of Centillium Technology Corporation, any unpublished document or
proprietary information belonging to any such employer, person, or entity,
unless consented to in writing by such employer, person, or entity.

Your acceptance of this offer represents the sole agreement between you and
Centillium Technology Corporation, no prior promises, representations or
understandings relative to any terms or conditions of your employment are to be
considered as part of this agreement unless expressed in writing in this letter.
Centillium Technology is an "at will": employer which means that this employment
relationship may be terminated at any time, with or without good cause or for
any or no cause, at the option either of the Company or employee, with or
without notice.

This offer is valid for four days from the date of this letter, unless any other
arrangements are made.  Please indicate your acceptance and start date by
signing and returning the enclosed copy of this letter.

Sincerely,

/s/ A. Travis White

A. Travis White
President and CEO

                         The foregoing terms and conditions are hereby accepted:

                         Start Date:  September 13, 1999
                                     -----------------------------------

                         Signed:      /s/ Jon Sherburne
                                 ---------------------------------------
                                      Jon Sherburne

                         Date:        8/18/99
                               -----------------------------------------

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