<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM QUARTERLY
REPORT FORM 10-Q THREE AND SIX MONTHS ENDED SEPTEMBER 30, 2000 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> JUL-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 79,224
<SECURITIES> 962,752
<RECEIVABLES> 50,346
<ALLOWANCES> 1,314
<INVENTORY> 11,153
<CURRENT-ASSETS> 1,117,093
<PP&E> 100,399
<DEPRECIATION> 47,584
<TOTAL-ASSETS> 1,392,422
<CURRENT-LIABILITIES> 50,680
<BONDS> 4,236
0
0
<COMMON> 1,266
<OTHER-SE> 1,325,008
<TOTAL-LIABILITY-AND-EQUITY> 1,392,422
<SALES> 97,007
<TOTAL-REVENUES> 97,007
<CGS> 24,532
<TOTAL-COSTS> 24,532
<OTHER-EXPENSES> 46,749
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 39
<INCOME-PRETAX> 39,191
<INCOME-TAX> 15,576
<INCOME-CONTINUING> 23,615
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 23,615
<EPS-BASIC> 0.10
<EPS-DILUTED> 0.09
</TABLE>