<ARTICLE>                     5
<MULTIPLIER>               1000

                                                        
<PERIOD-TYPE>               9-MOS                             9-MOS
<FISCAL-YEAR-END>           Dec-31-1999                       Dec-31-1998
<PERIOD-END>                Sep-30-2000                       Sep-30-1999
<CASH>                      31006                             26229
<SECURITIES>                115994                            60597
<RECEIVABLES>               61454<F1>                         38164<F1>
<ALLOWANCES>                0                                 0
<INVENTORY>                 34540                             20966
<CURRENT-ASSETS>            262492                            152936
<PP&E>                      69495<F2>                         55724<F2>
<DEPRECIATION>              0                                 0
<TOTAL-ASSETS>              341518                            217670
<CURRENT-LIABILITIES>       54331                             39634
<BONDS>                     2000                              2500
<PREFERRED-MANDATORY>       0                                 0
<PREFERRED>                 0                                 0
<COMMON>                    302                               281
<OTHER-SE>                  274044                            163653
<TOTAL-LIABILITY-AND-EQUITY>341518                            217670
<SALES>                     213118                            143142
<TOTAL-REVENUES>            213118                            143142
<CGS>                       99892                             67848
<TOTAL-COSTS>               99892                             67848
<OTHER-EXPENSES>            20570<F3>                         13513<F3>
<LOSS-PROVISION>            0                                 0
<INTEREST-EXPENSE>          981                               1120
<INCOME-PRETAX>             53301                             12909
<INCOME-TAX>                20244                             5754
<INCOME-CONTINUING>         0                                 0
<DISCONTINUED>              0                                 0
<EXTRAORDINARY>             0                                 0
<CHANGES>                   0                                 0
<NET-INCOME>                33057                             7155
<EPS-BASIC>                 1.18                              .27
<EPS-DILUTED>               1.09                              .25


<FN>
<F1>Net of  allowance  for doubtful  accounts,  consistent  with  balance  sheet
presentation. <F2>Net of accumulated depreciation, consistent with balance sheet
presentation.
<F3>Research and development expenses
</FN>