Citigroup’s Glen Yeung this morning turned positive on the chip sector, asserting that the sector has reach the right point in the cycle to jump in for the next upturn.

Yeung uses the 1990-91 downturn as a model for the current period, and concludes that “the risk/reward has now become favorable” for select names in the group. “It is optimal to invest ahead of the report of [the] first quarter of year-over-year GDP growth,” he writes, adding that current valuations are near 1990 troughs.” In a research note this morning, Yeung also contends that “estimate capitulation has occurred.” His bottom line: now is the right time to invest in semi names.

In connection with the call, he upgrades Integrated Device Technology (IDTI), Nvidia (NVDA) and STMicro (STM) to Buy from Hold. Yeung’s colleague, Craig Ellis, who covers specialty semis, raised Fairchild (FCS) to Hold from Sell, and National Semi (NSM) to Buy from Hold.

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It’s been a rough day for highly-leveraged semiconductor stocks.

In a research note this morning, Citigroup’s Glen Yeung provided a review of the credit liabilities of the chip companies Citi has under coverage. He notes that Advance Micro Devices (AMD), Spansion (SPSN), Infineon (IFX) and Qimonda (QI) all have debt coming due in the next 15 months. “In each instance, we point out that an already difficult financial position is compromised by the current credit market,” Yeung noted.

He also noted that AMD, MU and QI also rank among the chip companies with the worst interest coverage ratio.

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For the memory sector, it is a day to forget.

Last night, SanDisk (SNDK) reported an extremely nasty June quarter earnings report–the Street has responded with a host of downgrades. Meanwhile, this morning, Citigroup chip analyst Glen Yeung cut his ratings on Micron (MU), Qimonda (QI) and Spansion (SPSN) to Hold from Buy. The result is that all of the stocks in the beleaguered sector are getting pummeled. Again.

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