SAN FRANCISCO (AP) – Dallas-based Texas Instruments Inc. is buying National Semiconductor for $6.5 billion.

It’s a marriage of two of the world’s premier makers of analog chips, which are widely used in electronics to transform signals such as sound into digital form that computers can understand.

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TI, in scooping up National Semiconductor, is getting a storied Silicon Valley company whose history stretches back more than 50 years and is known for its power-management chips.

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TI has agreed to pay $25 per share. The all-cash transaction represents a 78 percent premium over National Semiconductor’s stock price before the deal was announced.

TI makes some 30,000 types of analog chips, while National, based in Santa Clara, Calif., makes 12,000.

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