* Dollar rises as Fed gives no details on debt purchases
* Fed leaves interest rates on hold
* Fed's U.S. economic outlook remains bleak (Recasts, updates prices, adds comment, changes byline)
By Gertrude Chavez-Dreyfuss
NEW YORK, Jan 28 (Reuters) - The U.S. dollar rose across the aboard on Wednesday after the Federal Reserve gave few additional details about buying long-term Treasuries, calming inflationary fears.
The Fed also kept interest rates steady near zero and said it was prepared to buy long-term Treasury debt only when credit conditions improve. Dollar investors fear the Fed's balance sheet will balloon further as it would need to essentially print more money to keep the economy afloat.
At the same time, the Fed's statement pacified the markets because it suggested that the U.S. central bank is pulling out all the stops to lift the economy out of recession.
"The market was expecting that the Fed would say that it would buy long-term U.S. Treasuries. But the fact that it said that it's not doing it right now was dollar-bullish," said Ken Landon, global currency strategist at JPMorgan Chase in New York.
"It would have been bearish for the dollar if the Fed had said that it would be buying Treasuries right now because it would be just printing money."
The euro <EUR=> fell to session lows at $1.3107 against the dollar after the Fed's statement from about $1.3270. It last traded at $1.3110, down 0.5 percent.
Against the yen <JPY=>, the dollar hit one-week highs at 90.79, according to electronic trading platform EBS. It was last at 90.46, up 1.7 percent from late on Tuesday.
The dollar rose 1.2 percent against the Swiss franc to 1.1542 francs <CHF=>.
Marc Chandler, global head of FX strategy at Brown Brothers Harriman in New York, also said the Fed did not provide new details on quantitative easing, and that was supportive of the dollar.
He added that $1.33 in the euro and $1.44 in sterling will be the near-term resistance levels for these two currencies. (Editing by Jan Paschal)