The G versions don’t help there because they are not 5V tolerant so cannot interface a 5V signal to a 2.5V system, for example. So, you can interface a 2.5V signal to a 5V system but not the other way round. The T versions have dual supply pins where the output supply can be up to 5V but not the input supply. The T versions are, such as the 74AXP1T57 but the G versions are not, e.g. So, are the NXP AXP devices a major step forward? The first thing I noticed is that they are not all 5V capable. Another alternative is to use the simple MOSFET translator for slow signals: To recap, the options for level translating, none of which are perfect, range from special purpose level translators such a the PCA9306 for I☬ or some low voltage chips which are 5V tolerant such as the or the SN74LVC245A. However, you can still be left with some incompatible voltages which need some additional circuitry to solve. Digital devices such as FPGAs also have separate core and input/output voltages, usually in blocks so one group of pins can interface with 3.3V and another group interfaces with 2.5V for example. For example the Analog Devices AD7655 analog to digital converter uses a 5V analog section but will interface down to 2.7V for the digital interface. Some devices help avoid the problem by having separate power supplies available for different parts of the chip. I discussed the problem of level shifting logic signals a while ago but I noticed the recently introduced NXP AXP level shifters so thought it was worth revisiting the subject to see if these new devices will really help solving the problem of interfacing the increasingly varied power supply voltages in digital and mixed-signal circuits.

1.8v logic voltage levels