<ARTICLE>                     5
<LEGEND>
THIS  SCHEDULE  CONTAINS  SUMMARY  FINANCIAL   INFORMATION  EXTRACTED  FROM  THE
CONDENSED  CONSOLIDATED BALANCE SHEET AND THE CONDENSED  CONSOLIDATED STATEMENT
OF  INCOME  AS FILED ON FORM  10-Q  FOR THE  PERIOD  ENDED  SEPTEMBER  30,  1997
(UNAUDITED)  AND IS QUALIFIED  IN ITS  ENTIRETY BY  REFERENCE TO SUCH  FINANCIAL
STATEMENTS.
</LEGEND>                      
<MULTIPLIER>                                   1000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                              DEC-31-1997
<PERIOD-START>                                 JAN-01-1997
<PERIOD-END>                                   SEP-30-1997
<CASH>                                         115,704
<SECURITIES>                                    69,147
<RECEIVABLES>                                   85,858
<ALLOWANCES>                                     6,047
<INVENTORY>                                     18,701
<CURRENT-ASSETS>                               307,548
<PP&E>                                          97,768
<DEPRECIATION>                                  57,771
<TOTAL-ASSETS>                                 367,032
<CURRENT-LIABILITIES>                          108,638
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           241
<OTHER-SE>                                     257,567
<TOTAL-LIABILITY-AND-EQUITY>                   367,032
<SALES>                                        347,602
<TOTAL-REVENUES>                               347,602
<CGS>                                          167,491
<TOTAL-COSTS>                                  167,491
<OTHER-EXPENSES>                               161,234
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 24,759
<INCOME-TAX>                                     7,675
<INCOME-CONTINUING>                             17,084
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,084
<EPS-PRIMARY>                                     0.72
<EPS-DILUTED>                                     0.71