<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          34,301
<SECURITIES>                                     9,450
<RECEIVABLES>                                   15,126
<ALLOWANCES>                                     (355)
<INVENTORY>                                      6,966
<CURRENT-ASSETS>                                69,605
<PP&E>                                          20,626
<DEPRECIATION>                                   5,298
<TOTAL-ASSETS>                                  94,992
<CURRENT-LIABILITIES>                           11,459
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             8
<OTHER-SE>                                      79,687
<TOTAL-LIABILITY-AND-EQUITY>                    94,992
<SALES>                                         43,627
<TOTAL-REVENUES>                                43,627
<CGS>                                           20,146
<TOTAL-COSTS>                                   35,697
<OTHER-EXPENSES>                                   348
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               (140)
<INCOME-PRETAX>                                  8,984
<INCOME-TAX>                                     3,738
<INCOME-CONTINUING>                              5,246
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,246
<EPS-PRIMARY>                                     0.67
<EPS-DILUTED>                                     0.66