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SN74LVC2G34: Can I use this as a lazy mans level shifter?

Louie
Expert 3180 points
Part Number: SN74LVC2G34
Other Parts Discussed in Thread: SN74LVC2G07

Hello,

I want to level shift my signal from 1.8V to 3.3V.

I was considering using this device with a 3.3V supply and just having it output the 3.3V high when it sees 1.8V.

I do not need this to be bidirectional, however, this device says VIH must be 2V. How much tolerance would you say I have for making this 3.3V from 1.8V?

How reliable would that be?

Is there an alternative device that you would suggest?

Thank you,

Louie

  • 0
    TI__Guru* 97046 points

    Hi Louie,

    It's generally a bad idea to put voltage close to the threshold into a CMOS input. It's not because the threshold won't trip, but because you will be sinking a ton of current from Vcc to ground (shoot-through current... usually on the order of 50mA).  This can cause damage to the device, and definitely will eat a lot of power unnecessarily.

    I would recommend using an open drain buffer with a pull-up to 3.3V on the output and the supply set to 1.8V.  SN74LVC2G07 would work.