Well, there are many. You need to specify what is your maximum frequency, how many bits you need, etc. In short, you can use many voltage level translator IC. Texas Instruments has a neat selection tool for the very same purpose: http://www.ti.com/logic/docs/translationresults.tsp?sectionId=458&voltageIn=5.0&searchDirection=2&voltageOut=3.3#voltintf

Well, there are many. You need to specify what is your maximum frequency, how many bits you need, etc. In short, you can use any voltage level translator IC. Texas Instruments has a neat selection tool for the very same purpose: http://www.ti.com/logic/docs/translationresults.tsp?sectionId=458&voltageIn=5.0&searchDirection=2&voltageOut=3.3#voltintf