* Portugal bond yield at new high as bailout fears grow
* Wall Street buoyed by Texas Instruments deal
* Euro slips; world stocks end five-day winning streak (Rewrites, adds details, quote, updates prices)
By Leah Schnurr
NEW YORK, April 5 (Reuters) - An interest rate hike in China and a downgrade of Portugal's debt pushed the euro further away from a five-month peak against the dollar on Tuesday, but a large technology company merger helped put a floor in U.S. stocks.
Wall Street shares crept higher after Texas Instruments <TXN.N> said it would buy rival National Semiconductor Corp <NSM.N> $6.5 billion. Oil prices also shrugged off the China rate hike, holding near 2-1/2-year highs.
China, viewed as a main source of global growth, lifted interest rates for the fourth time since October to cool inflation. For details, see [
]"The market is getting used to the rate hikes in China, and there is less concern it will derail global growth," said Jeff Kleintop, chief market strategist at LPL Financial in Boston of the U.S. stock market.
"On the plus side there's this M&A deal in the tech space," he said. "Companies are beginning to spend their cash on merger deals and also on hiring. They're feeling confident enough to spend on growth initiatives."
Rating agency Moody's cut Portugal's sovereign debt by one notch, saying the incoming government would urgently need to seek financial aid from the European Union. Portuguese bond yields rose to euro lifetime highs. [
]"Even though Moody's still rates the sovereign two notches higher than Standard & Poor's, the downgrade is another blow to sentiment," said Gavan Nolan, an analyst at data monitor Markit.
There were also reports that Portuguese banks may be threatening to stop buying government bonds to pressure Lisbon into seeking a bailout, following the same path as Greece and Ireland. [
]Yields on Portugal's 10-year government bonds <PT10YT=TWEB> rose as high as 9.033 percent, while Portuguese stocks <
> fell 0.7 percent. The Portuguese market fared worse than the broader FTSEurofirst 300 index < >, which gained 0.2 percent.Credit default swaps implied a 41 percent probability of a Portuguese default within five years, compared with 33 percent at the end of February, data provider CMA said. [
]The euro <EUR=> fell against the dollar for the second day but trimmed losses after talk of a hawkish U.S. think-tank report on European Central Bank monetary policy. The euro was last trading at $1.4194, down 0.2 percent on the day, according to Reuters data.
The single currency was also supported by expectations the European Central Bank when it meets on Thursday will raise rates by 25 basis points from a record low of 1 percent to tame inflationary pressures. <ECBWATCH>
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Graphics on Thursday's ECB meeting:
http://r.reuters.com/kah88r
Graphic on euro zone credit ratings:
http://r.reuters.com/pyh48r
Graphic on China rate rise: http://r.reuters.com/veh88r
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CHINA HIKE NOT SEEN TOO WORRISOME
Global stocks snapped a five-day winning streak with the MSCI All-Country World Index <.MIWD00000PUS> to trade flat after hitting six-week highs in the previous session.
The Dow Jones industrial average <
> added 18.13 points, or 0.15 percent, to 12,418.16. The Standard & Poor's 500 Index <.SPX> gained 2.84 points, or 0.21 percent, to 1,335.71. The Nasdaq Composite Index < > rose 10.66 points, or 0.38 percent, to 2,799.85.Brent crude <LCOc1> prices topped $122 a barrel, recouping losses as worries about supply from oil-producing countries in Africa and the Middle East overshadowed China's rate hike. Brent futures were up 98 cents at $122.05 a barrel, while U.S. crude futures <CLc1> were down 22 cents at $108.25.
Federal Reserve Chairman Ben Bernanke said late on Monday that the recent spike in U.S. inflation was unlikely to persist.
But sustained higher oil prices could pose a serious threat to the global economic recovery and dampen risk appetite. Investors were awaiting the release of minutes from the latest rate-setting committee meeting of the Fed later in the afternoon.
"The recent rally in oil has had virtually no impact on equities. It was just over a month ago where equities markets were nervous about the impact of oil prices on the economy," Deutsche Bank strategist Jim Reid said in a note.
"The difference this time is that the rise has likely been due to decent growth rather than immediate geopolitical concerns. Nevertheless one would expect the creeping price of oil to start to get more attention given the recent rally." (Additional reporting by Nick Olivari and Rodrigo Campos; Editing by Padraic Cassidy)