<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE THREE
MONTHS ENDED JUNE 30, 2000 QUARTERLY REPORT ON FORM 10-Q 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> APR-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 189,812
<SECURITIES> 784,255
<RECEIVABLES> 38,960
<ALLOWANCES> 689
<INVENTORY> 11,092
<CURRENT-ASSETS> 1,039,967
<PP&E> 89,723
<DEPRECIATION> 44,810
<TOTAL-ASSETS> 1,282,107
<CURRENT-LIABILITIES> 41,747
<BONDS> 4,768
0
0
<COMMON> 1,246
<OTHER-SE> 1,234,346
<TOTAL-LIABILITY-AND-EQUITY> 1,282,107
<SALES> 74,188
<TOTAL-REVENUES> 74,188
<CGS> 19,314
<TOTAL-COSTS> 19,314
<OTHER-EXPENSES> 49,532
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 43
<INCOME-PRETAX> 17,619
<INCOME-TAX> 14,224
<INCOME-CONTINUING> 3,395
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 3,395
<EPS-BASIC> $0.03
<EPS-DILUTED> $0.03
</TABLE>