Apple ( AAPL) finally took the wraps off its iPhone Tuesday. But investors didn't wait for details about which components were inside the long-awaited phone to bulk up on chip stocks that might benefit. Within a half-hour of Jobs' first words about the iPhone during his speech at the MacWorld conference in San Francisco, shares of various chipmakers took flight. Marvell Technology Group ( MRVL), RF Micro Devices ( RFMD), Atheros Communications ( ATHR) and Maxim Integrated ( MXIM), all of which make chips used in cell phones and electronic gadgets, saw their stocks rise in unison immediately after the iPhone announcement. The various features within the iPhone, from Wi-Fi capabilities to a digital camera, mean there are plenty of specialized chips crammed inside the thin device. Though it's still unclear which companies are providing the silicon inside the iPhone, investors appeared eager to place bets on the most likely candidates. Broadcom ( BRCM) was up about 4.6%, or $1.51, at $34.36 in midday trading. UBS analyst Alex Gauna speculated in a note that Broadcom may have provided the integrated circuit controller enabling the phone's multitouch capability. UBS makes a market in shares of Apple and Broadcom and has provided non-investment-banking services to Apple in the past 12 months.