<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM LUMISYS
INCORPORATED CONSOLIDATED BALANCE SHEETS AT SEPTEMBER 30, 1997 AND
CONSOLIDATED STATEMENTS OF INCOME FOR THE THREE AND NINE MONTHS ENDED
SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>  1000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-END>                               SEP-30-1997             SEP-30-1997
<CASH>                                           21389                   21389
<SECURITIES>                                         0                       0
<RECEIVABLES>                                     3915                    3915
<ALLOWANCES>                                     (331)                   (331)
<INVENTORY>                                       3123                    3123
<CURRENT-ASSETS>                                 29683                   29683
<PP&E>                                            1247                    1247
<DEPRECIATION>                                   (856)                   (856)
<TOTAL-ASSETS>                                   30117                   30117
<CURRENT-LIABILITIES>                             3799                    3799
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                             6                       6
<OTHER-SE>                                       26312                   26312
<TOTAL-LIABILITY-AND-EQUITY>                     30117                   30117
<SALES>                                           6032                   17161
<TOTAL-REVENUES>                                  6032                   17161
<CGS>                                             2630                    7601
<TOTAL-COSTS>                                     2630                    7601
<OTHER-EXPENSES>                                  2646                    7174
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               (255)                   (757)
<INCOME-PRETAX>                                   1011                    3143
<INCOME-TAX>                                       395                    1225
<INCOME-CONTINUING>                                616                    1918
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       616                    1918
<EPS-PRIMARY>                                      .09                     .29
<EPS-DILUTED>                                      .09                     .29
        

</TABLE>