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SN74CBT3384C: Can the device be used as a level shifter

Michael T Schneider
Expert 3780 points
Part Number: SN74CBT3384C

I had a question regarding the following part: SN74CBT3384C . On the datasheet, Digital Input LOGIC HIGH starts at 2 V. Logic LOW ends at 0.8 V. Would it be possible to use this part as a level shifter (input 3.3V to drive a 5V circuit) since the part would interpret a 3.3 V signal input as LOGIC HIGH?

Image taken from: https://www.ti.com/lit/ds/symlink/sn74cbt3384c.pdf

  • 0
    TI__Mastermind 45370 points

    Michael,

    This device is a passive FET switch and doesn't have any drive capability.  This device will simply pass the voltage driven by the external circuit attached from one side of the of the I/O to the other side with the load. 

    Why are you looking at a FET switch instead of a voltage level shifter for your application?  SN74GTL2010

    Do you have a diagram of your application and a description of the type of signals you are passing?

     

  • 0 in reply to Adam Torma
    TI__Guru* 96681 points

    Hey Michael,

    If you're asking if the device can be controlled with 3.3V when the supply is 5V, then yes, it can.  From page 1 of the datasheet:

    * Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs

    If you're looking for a device to convert digital signals between two voltage nodes, let me know the details of the digital signals (voltages, data rates, load, etc.) and I'll be happy to help find the right device for you.