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Original question:

[FAQ] Are there voltage level translation / level shifter device recommendations for the industry standard interfaces like...

TXU0104: Data transmission direction in TXU0104

Adam Steele
Prodigy 100 points
Part Number: TXU0104

I need to level shift from 3.3V microcontroller to 5V SPI DAC with CS, CLK, MOSI pins.  Data only flows form the uC to the DAC. Since I only need transmission in one direction, the TXU0104 seems like a good fit. However the datasheet for TXU0104 is confusing.

It says (pg 1) : "Fixed direction data transmission can occur from A to B or B to A when OE is set to high in reference to either supply." 

and on page 20: "The TXU0104 device is designed for asynchronous communication between data buses, and transmits data with fixed direction from the A bus to the B bus on some channels and from the B bus to the A bus on the remaining channels."

All the diagrams in the sheet show the data flows form A to B and I also don't see anything what would allow me to set the direction for individual channels or anything other than all channels being from A to B.

Can someone help clarify the operation of this device?

  • 0
    TI__Mastermind 31935 points

    HI Adam,

    Please note that the datasheet describes / showcases 3 options of the 4ch TXU0x04 devices with flexibility for different variations (4 in 4 out / 2 in 2 out / 3 in 1 out) as shown below and data transmission for the mentioned TXU0104  would be for A to B, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Prodigy 100 points

    HI Michael. Thanks for your feedback. Are you 100% sure of this?

    If so, the datasheet really should be reworded.Those products have their own datasheets. If 0104 only transmits in one direction then it shouldn't say otherwise!

  • +1 in reply to Adam Steele
    TI__Mastermind 31935 points

    Hi Adam,

    Yes, it is intentionally done as such to inform of all options. Please further note that the datasheet mentions it can occur in A to B or B to A as this is dependent on the option. I can further go ahead to highlight to the team for additional clarification on the wording. However, all other information pertaining to 0104 (including the pin configuration and functions shown below) clarifies it as the option for 4 inputs and 4 outputs.

    They do have their own datasheets each also clarify the function and number of inputs / outputs. However, someone may overlook the alternatives if looking at individual datasheets that do not showcase all alternative options, thanks.

    Best Regards,

    Michael.