<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                         103,731                 117,129                 136,911
<SECURITIES>                                     4,985                   9,513                   4,835
<RECEIVABLES>                                   54,856                  42,871                  45,004
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                     19,607                  21,471                  26,912
<CURRENT-ASSETS>                               214,533                 226,398                 242,517
<PP&E>                                          46,863                  51,236                  53,554
<DEPRECIATION>                                  22,762                  25,784                  29,166
<TOTAL-ASSETS>                                 300,778                 288,505                 304,502
<CURRENT-LIABILITIES>                           68,105                  46,645                  48,508
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                       196,432                 198,181                 202,105
<OTHER-SE>                                    (56,845)                (48,966)                (39,445)
<TOTAL-LIABILITY-AND-EQUITY>                   300,778                 288,505                 304,502
<SALES>                                         94,132                 165,230                 246,947
<TOTAL-REVENUES>                                94,132                 165,230                 246,947
<CGS>                                           40,975                  72,253                 109,003
<TOTAL-COSTS>                                   40,975                  72,253                 109,003
<OTHER-EXPENSES>                                28,682                  56,472                  86,825
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               1,067                   1,602                   1,635
<INCOME-PRETAX>                                 23,408                  34,903                  49,484
<INCOME-TAX>                                     7,958                  11,907                  16,865
<INCOME-CONTINUING>                             15,395                  23,079                  32,742
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    15,395                  23,079                  32,742
<EPS-PRIMARY>                                     0.43                    0.64                    0.90
<EPS-DILUTED>                                     0.40                    0.60                    0.85
        


</TABLE>