<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE INCOME
STATEMENT FOR THE NINE-MONTH PERIOD ENDED SEPTEMBER 30, 1997, AND THE BALANCE
SHEET AS OF SPETEMBER 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          13,833
<SECURITIES>                                    11,311
<RECEIVABLES>                                   13,399
<ALLOWANCES>                                       629
<INVENTORY>                                     10,336
<CURRENT-ASSETS>                                51,847
<PP&E>                                          17,017
<DEPRECIATION>                                  10,149
<TOTAL-ASSETS>                                  64,637
<CURRENT-LIABILITIES>                            7,517
<BONDS>                                            185
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            75
<OTHER-SE>                                      55,659
<TOTAL-LIABILITY-AND-EQUITY>                    64,637
<SALES>                                         27,902
<TOTAL-REVENUES>                                36,373
<CGS>                                            9,687
<TOTAL-COSTS>                                   12,457
<OTHER-EXPENSES>                                17,689
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  33
<INCOME-PRETAX>                                  6,950
<INCOME-TAX>                                     2,433
<INCOME-CONTINUING>                              4,517
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,517
<EPS-PRIMARY>                                      .59
<EPS-DILUTED>                                      .59