Texas Instruments is building a $60 billion U.S. manufacturing megaproject where Apple vows to make "critical foundation semiconductors" for iPhones and other devices. CNBC went to Sherman, Texas, for an exclusive first look inside the newest fab of seven TI's building in Utah and Texas to provide U.S.-made chips to customers like Nvidia and Ford. TI shares have suffered amid tariff concerns, and it's lost analog market share for several years, but top leaders are confident about the huge spend.