<ARTICLE> 5 <MULTIPLIER> 1000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> SEP-30-1999 <CASH> 117,098 <SECURITIES> 160,275 <RECEIVABLES> 61,046 <ALLOWANCES> 0 <INVENTORY> 12,373 <CURRENT-ASSETS> 377,429 <PP&E> 81,575 <DEPRECIATION> 47,694 <TOTAL-ASSETS> 424,967 <CURRENT-LIABILITIES> 73,618 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 270,932 <OTHER-SE> 56,628 <TOTAL-LIABILITY-AND-EQUITY> 424,967 <SALES> 291,922 <TOTAL-REVENUES> 291,922 <CGS> 130,947 <TOTAL-COSTS> 130,947 <OTHER-EXPENSES> 112,336 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 1,064 <INCOME-PRETAX> 55,723 <INCOME-TAX> 16,717 <INCOME-CONTINUING> 38,625 <DISCONTINUED> 0 <EXTRAORDINARY> 33 <CHANGES> 0 <NET-INCOME> 38,658 <EPS-BASIC> 0.98 <EPS-DILUTED> 0.91