<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM LUMISYS
INCORPORATED CONSOLIDATED BALANCE SHEETS AT SEPTEMBER 30, 2000 AND CONSOLIDATED
STATEMENTS OF INCOME FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2000 AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENT.
</LEGEND>
<CIK> 0001001289
<NAME> LUMISYS INCORPORATED
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000             DEC-31-2000
<PERIOD-START>                             JUL-01-2000             JAN-01-2000
<PERIOD-END>                               SEP-30-2000             SEP-30-2000
<CASH>                                           9,732                   9,732
<SECURITIES>                                     4,573                   4,573
<RECEIVABLES>                                    3,183                   3,183
<ALLOWANCES>                                     (807)                   (807)
<INVENTORY>                                      3,462                   3,462
<CURRENT-ASSETS>                                 2,514                   2,514
<PP&E>                                           2,401                   2,401
<DEPRECIATION>                                 (1,778)                 (1,778)
<TOTAL-ASSETS>                                  23,280                  23,280
<CURRENT-LIABILITIES>                            4,855                   4,855
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                             9                       9
<OTHER-SE>                                      18,236                  18,236
<TOTAL-LIABILITY-AND-EQUITY>                    23,280                  23,280
<SALES>                                          4,473                  14,755
<TOTAL-REVENUES>                                 4,473                  14,755
<CGS>                                            2,348                   7,912
<TOTAL-COSTS>                                    2,348                   7,912
<OTHER-EXPENSES>                                 3,030                   8,894
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               (161)                   (617)
<INCOME-PRETAX>                                  (744)                 (1,434)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                              (744)                 (1,434)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     (744)                 (1,434)
<EPS-BASIC>                                      (.08)                   (.16)
<EPS-DILUTED>                                    (.08)                   (.16)


</TABLE>