<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
condensed  balance  sheet,  condensed  statement  of  operations  and  condensed
statement of cash flows  included in the Company's  Form 10-K for the year ended
December  31,  1999  and is  qualified  in its  entirety  by  reference  to such
financial statements and the notes thereto.
</LEGEND>
<MULTIPLIER>                                              1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                                   DEC-31-1999
<PERIOD-START>                                      JAN-01-1999
<PERIOD-END>                                        DEC-31-1999
<CASH>                                                  163,824
<SECURITIES>                                            306,504
<RECEIVABLES>                                            83,170
<ALLOWANCES>                                              1,266
<INVENTORY>                                              11,878
<CURRENT-ASSETS>                                        589,012
<PP&E>                                                  100,441
<DEPRECIATION>                                           50,665
<TOTAL-ASSETS>                                          656,075
<CURRENT-LIABILITIES>                                   101,421
<BONDS>                                                   3,467
<PREFERRED-MANDATORY>                                         0
<PREFERRED>                                                   0
<COMMON>                                                    557
<OTHER-SE>                                              550,630
<TOTAL-LIABILITY-AND-EQUITY>                            656,075
<SALES>                                                 570,752
<TOTAL-REVENUES>                                        570,752
<CGS>                                                   290,636
<TOTAL-COSTS>                                           290,636
<OTHER-EXPENSES>                                        154,169
<LOSS-PROVISION>                                              0
<INTEREST-EXPENSE>                                            0
<INCOME-PRETAX>                                         142,197
<INCOME-TAX>                                             46,914
<INCOME-CONTINUING>                                      95,283
<DISCONTINUED>                                                0
<EXTRAORDINARY>                                               0
<CHANGES>                                                     0
<NET-INCOME>                                             95,283
<EPS-BASIC>                                                1.74
<EPS-DILUTED>                                              1.67