Here’s a fairly old app note on Fairchild’s take of voltage translation ICs.
The Fairchild CMOS Translating Transceivers: 74LVX3245, 74LVX4245, 74LVXC3245, and 74LVXC4245 are true voltage translating devices. This is accomplished by electrically isolating the A-side from the B-side.
The LVX Translating Transceivers are divided into two types of devices, Dual Supply Translating Transceivers, and Dual Supply Configurable Voltage Interface Transceivers. These devices offer the system designer multiple options for true voltage level translation in a system.
Careful selection of the appropriate configuration and attention to the power up considerations discussed in this applications note can make interfacing in a mixed voltage environment an easy task.