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

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

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 when VCC = 0 V without drawing extra current. Additionally, it provides easy level shifting without increasing the propagation delay.
 

[Figure: Level shift from 2.5V to 1.8V]


VOH is close to the power supply voltage (VCC) when a CMOS input of the subsequent-stage IC is driven by a CMOS output of the previous-stage IC. Thus, level shifting from a lower voltage to a higher voltage such as from 1.8 V to 2.5 V can be performed if output voltage, VOH, of the driving IC satisfies the input voltage (VIH) range of the driven IC.

[Figure: Level shift from 1.8V to 2.5V]

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