<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          53,200
<SECURITIES>                                    26,435
<RECEIVABLES>                                   40,137
<ALLOWANCES>                                       634
<INVENTORY>                                     10,822
<CURRENT-ASSETS>                               140,455
<PP&E>                                          32,796
<DEPRECIATION>                                  23,026
<TOTAL-ASSETS>                                 166,688
<CURRENT-LIABILITIES>                           30,386
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        87,616
<OTHER-SE>                                      46,361
<TOTAL-LIABILITY-AND-EQUITY>                   166,688
<SALES>                                         42,949
<TOTAL-REVENUES>                                42,949
<CGS>                                           14,131
<TOTAL-COSTS>                                   14,131
<OTHER-EXPENSES>                                16,442
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 13,488
<INCOME-TAX>                                     5,123
<INCOME-CONTINUING>                              8,365
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,365
<EPS-PRIMARY>                                     0.16<F1><F2>
<EPS-DILUTED>                                     0.14<F2>
<FN>
<F1>DATA LISTED FOR "EPS-PRIMARY" IS THE NEWLY DEFINED "BASIC EPS"
<F2>EPS DATA REFLECTS TWO-FOR-ONE SPLIT OF THE COMPANY'S COMMON STOCK
EFFECTED JULY 6, 1998.
</FN>