<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FORM
10-Q FOR THE QUARTER ENDED SEPTEMBER 30, 1998 AND IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                          33,445
<SECURITIES>                                    36,754
<RECEIVABLES>                                   14,509
<ALLOWANCES>                                       938
<INVENTORY>                                     14,121
<CURRENT-ASSETS>                               101,793
<PP&E>                                          23,693
<DEPRECIATION>                                  14,538
<TOTAL-ASSETS>                                 144,359
<CURRENT-LIABILITIES>                           21,700
<BONDS>                                          1,445
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           314
<OTHER-SE>                                     120,900
<TOTAL-LIABILITY-AND-EQUITY>                   144,359
<SALES>                                         67,520
<TOTAL-REVENUES>                                67,520
<CGS>                                           40,457
<TOTAL-COSTS>                                   68,060
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                   166
<INTEREST-EXPENSE>                                 630
<INCOME-PRETAX>                                 36,331
<INCOME-TAX>                                     4,952
<INCOME-CONTINUING>                             31,379
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    31,379
<EPS-PRIMARY>                                     1.00
<EPS-DILUTED>                                     1.00