0001285081-07-000068 4 1 20070914 20070917 20070917 SILICON LABORATORIES INC 0001038074 3674 742793174 DE 1231 400 W CESAR CHAVEZ AUSTIN TX 78701 5124168500 400 W CESAR CHAVEZ AUSTIN TX 78701 Walsh Paul V Jr 0001362672 4 34 000-29823 071120033 512-416-8500 400 W CESAR CHAVEZ AUSTIN TX 78701 4 1 primary_doc.xml PRIMARY DOCUMENT