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What options do I have to perform level shifting from 1.8 V to 2.5 V and vice versa?

Down translation using an input-tolerant function
Down translation using an input-tolerant function

The following figure shows level shifting from 2.5 V to 1.8 V and from 1.8 V to 2.5V.

Down translation (High-to-low voltage level translation):
The input-tolerant function allows level shifting from a higher voltage to a lower voltage such as from 2.5 V to 1.8 V. For example, the input-tolerant function allows 3.3 V to be applied to an input without drawing extra current even when VCC = 0 V.

Example of input specifications (74LCX244)
Example of input specifications (74LCX244)

For down translation using the input-tolerant function of a CMOS logic IC, ensure that the maximum low-level input voltage is within the VIL range.

Up translation
Up translation

Up translation (Low-to-High voltage level translation):
Level shifting from a lower voltage to a higher voltage such as from 1.8 V to 2.5 V can be performed if the high-level output voltage (VOH) of the driving IC satisfies the high-level input voltage (VIH) of the driven IC because VOH is almost equal to the supply voltage (VCC).

Example of VIH specifications of a CMOS logic IC (74LCX00FT)
Example of VIH specifications of a CMOS logic IC (74LCX00FT)
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