• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 20 subscribers
  • Views 727 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TXS0108E: Level Translator recommendation for Wiegand Interface

TXS0108E: Level Translator recommendation for Wiegand Interface

SRC
Intellectual 260 points
Part Number: TXS0108E
Other Parts Discussed in Thread: SN74LVC8T245, SN74AXC4T245, SN74AXC4T774, SN74AXC8T245, SN74LV4T125

Hi Team,

We are working in our custom design. We were facing issue with TXS0108E. As per the recommendation in the https://e2e.ti.com/support/logic/f/151/t/796359, we tested with the DIR controlled device like SN74LVC8T245. We found significant improvement. But, in these series, we could found only 2-Bit or 8-Bit Level device.

We need 4-Bit Device for some reason and is there any 4-Bit Device from similar series. Also, are there any device where OE is active high?

Are there any 8-Bit device, where 4-Bit can be controlled from A to B side and remaining 4-Bit can be controlled from B to A side? 

  • 0
    TI__Mastermind 45725 points

    Hey SRC,

    Could I get the supply voltages? We have devices like this in our new AXC family, but it looks like you might be translating to 5 V.

  • 0
    TI__Genius 16735 points

    Hi,

    We have all the devices you are looking for in the AXC family. We don't have anything with OE that is active high however, you can use one of our inverters in front of that pin.

    Here are the suggestions:

    For the 245 we have the 4 bit version SN74AXC4T245. We also have the SN74AXC4T774 where each bit has a separate direction control. 

    For the 8 bit device with 4 bit direction control we have the SN74AXC8T245.

    Thanks!

    -Karan

  • 0 in reply to Dylan Hubbard
    Intellectual 260 points

    Hi Dylan,

    We need to translate the signals from 3.3V to 5V and also from 5V to 3.3V.

  • 0 in reply to Karan Kotadia
    Intellectual 260 points

    Hi Karan,

    Thanks for your reply. 

    We need to translate the signals from 3.3V to 5V and also from 5V to 3.3V.

    The suggested AXC parts can be used for translation of signals from 0.65 V to 3.6 V. We are looking for parts which can be used for translation of 5V signals.

  • 0 in reply to SRC
    TI__Mastermind 45725 points

    Hi SRC,

    Unfortunately, for that level shifting you would need to use something from the LVC, TXB, or TXS family. TXS family is mainly ideal for open drain communication interfaces like I2C. TXB may be a better option for push-pull interfaces, but I always advise using a unidirectional or direction controlled level shifter for unidirectional signals. The SN74LV4T125 is a 4 channel unidirectional level shifter that allows for individual channel enabling.