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EXHIBIT 10.23

AMENDED AND RESTATED UNSECURED PROMISSORY NOTE

$150,000.00   March 31, 2001

        WHEREAS, on July 13, 2000, Ronald D. Zimmerman ("Borrower") executed an
unsecured promissory note ("Note") for $150,000 in favor of QuickLogic
Corporation, a Delaware corporation ("QuickLogic") and the note was subsequently
amended on January 18, 2001;

        WHEREAS, the principal and interest under the Note were due and payable
on March 31, 2001 under the amendment; and

        WHEREAS, Borrower and QuickLogic now desire to amend and restate the
Note to provide that the principal and interest under the Note shall be due and
payable upon demand by QuickLogic;

        NOW THEREFORE, Borrower and QuickLogic agree as follows:

        For value received, Borrower promises to pay to QuickLogic the principal
sum of $150,000.00 with interest thereof accrued from July 13, 2000 at the
annual simple interest rate of 5.0%, on the unpaid balance of the principal sum.
Said principal and all accrued interest shall be due and payable upon demand by
QuickLogic.

        In the event that Borrower breaches this agreement by failing to pay
principal and interest when due, QuickLogic may withhold salary or cause the
exercise and sale of Borrower's options to purchase QuickLogic shares. Proceeds
from such sale, up to the balance due, will be paid directly to QuickLogic.

        The holder of this Note shall have full recourse against the undersigned
personally for failure to pay the Note as and when due.

        The principal is payable in lawful money of the United States of
America. The privilege is reserved to prepay any portion of the Note at any time
without any pre-payment penalty.

        Should suit be commenced to collect this Note or any portion thereof,
such sum as the Court may deem reasonable shall be added hereto as attorneys'
fees. The maker waives presentment for payment, protest, notice of protest and
notice of non-payment of this Note. This Note shall be governed by the laws of
the State of California as they apply to contracts entered into and wholly to be
performed within such state.

    Borrower:
 
 
/s/  RONALD D. ZIMMERMAN      

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Ronald D. Zimmerman
 
 
QuickLogic Corporation:
 
 
Signature:
 
/s/  ARTHUR O. WHIPPLE      

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Title:
 
CFO

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Name:
 
Arthur O. Whipple

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EXHIBIT 10.23

AMENDED AND RESTATED UNSECURED PROMISSORY NOTE