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LSF0108-Q1: Regarding Pull up values

Maharajan P
Intellectual 485 points

Part Number: LSF0108-Q1
Other Parts Discussed in Thread: TXV0108-Q1

Hi team, 
I am using the following Voltage level ranslating part in my design.

LSF0108QPWRQ1 

I came across some of the cases in the forum saying that It requires Pull up resistors for the Signals.

i am using this level translator for Translating the Level of the GPIO sigle ended signals from 1.2V-1.8V (Configurable) to 1.8V -3.3V confirgurable.

My Speed requirement is 100MHz, 

Please guide me to choose the pull up resistors values and where it is necessary.

Since it is 8 channel i have used 10K Pull up for both the side, A[1:8] pulled up to vref A, B[1:8] Pulled up to Vref B.

Please suggest.

Looking forward to your response, 

Thank you and best regards, 
Maharajan P

  • 0
    TI__Mastermind 48151 points

    Hello,

    While the device can support 100MHz, note that the device architecture is FET based so there isn't any buffering of the output signals. If at all possible, I would recommend using a fixed direction/ direction controlled translator instead that can better suit signals at these high speeds: TXV0108-Q1/ AXC8T245-Q1/AVC8T245-Q1. These devices also do not require pullup resistors at the outputs, allowing for more direct implementation. 

    Regards,

    Jack