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Original question:

SPI Driver Selection

TXB0102: SPI Driver Selection

Nolan Hoenicke
Prodigy 70 points
Part Number: TXB0102
Other Parts Discussed in Thread: TXU0102, SN74LXC2T45

Hi there. I'm looking for a level shifter/buffer for an SPI master running at 1.8V to 8 slaves at 3.3V.  And in a package rated for 125C.  Individual OE control by the Master. MISO will not be used.  

I'm a little unclear on which product line to use between TXB0102, TXU0102, SN74LXC2T45, etc.  They seem very similar to me. The TXB0102 has a buffered architecture but I thought all of these are acting as a buffer.  What exactly does that mean.  It looks like the SN74LXC2T45 might be best suited but I'd like to understand the differences better.  Thanks for any help!

  • 0
    TI__Genius 15990 points

    Hey Nolan,

    Buffers essentially redrives the signal for further downstream devices, which is especially useful over longer distances. You can see how much drive strength the device has by looking at IOH/IOL specs in the datasheets. 

    You are right that these 3 devices are buffered (TXB0102, TXU0102, and LXC2T45). However TXB0102 (drive strength ~20uA) belongs in the auto-bidirectional translators category, meaning they have very low drive strength on their own. TXU0102 (drive strength ~12mA) and LXC2T45 (drive strength ~32mA) on the other hand provide for a better solution. 

    Nolan Hoenicke said:
    Individual OE control by the Master.

    If an OE pin is needed , then the clear choice would be the TXU0102 as device features the OE pin whereas the LXC2T45 does not.

    Cheers,

    Jack