• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 20 subscribers
  • Views 434 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.

TXB0101: Recommended pull down and pull up resistors for OE pin or can it be hard shorted?

Arvind G N
Prodigy 10 points
Part Number: TXB0101

Hi Team,

I am using the TXB0101 in a bidirectional level-shifting/buffering application but requires both enabling and disabling the buffer according to various needs.

  1. Can I hard short the OE pin to ground and VCCA for enabling and disabling the buffer respectively or should I add pull-down and pull-up resistors for the same. If so what are the recommended values of the resistors?
  2. Also what is the recommended value of the bypass capacitors for the VCCA and VCCB pins for 12 MHz applications? Will 0.1uF do? 

Thanks in advance!

Kind Regards,

Arvind

  • +1
    Guru 317280 points

    The OE pin is a plain CMOS input. Such an input has an extremely high input impedance and does not need a pull-up/-down resistor.

    The bypass capacitor recommendation in all recent logic datasheets is:

    Each VCC terminal should have a good bypass capacitor to prevent power disturbance. A 0.1-μF capacitor is recommended for this device. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. The 0.1-μF and 1-μF capacitors are commonly used in parallel. The bypass capacitor should be installed as close to the power terminal as possible for best results, as shown in given example layout image.

  • 0 in reply to Clemens Ladisch
    TI__Prodigy 10 points

    Hi Clemens Ladisch,

    Thanks for the clarification. I'll go with the above suggested options.

    Kind Regards,

    Arvind