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What options do I have to perform level shifting from 5 V to 3.3 V and vice versa?

The following figure shows level shifting from 5 V to 3.3 V and from 3.3 V to 5 V.

The input-tolerant function allows level shifting from a higher voltage to a lower voltage such as from 5 V to 3.3 V. For example, the input-tolerant function allows 5 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 5V to 3.3V]


Level shifting from a lower voltage to a higher voltage such as from 3.3 V to 5 V can be performed if output voltage, VOH, of the driving IC satisfies the input voltage (VIH) range of the driven IC because 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. 

[Figure: Level shift from 3.3V to 5V]
 

 The following figure shows an example of LCX05/07, am N-channel open-drain device with an output-tolerant function. The external pull-up resistor allows the output to fully swing up to the Vcc level.

[Figure: Level shift from 3.3V to 5V (Nch open drain output with output tolerant function)]

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