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LSF0204: LSF0204

Ishwar Sharma
Prodigy 160 points
Part Number: LSF0204
Other Parts Discussed in Thread: TXV0106

Tool/software:

Hi

We are using LSF0204 in our new design.

Can you please clarify below queries.

1. Do we need pull up on both sides (A and B) to achieve 100 MHz data speed for Push-Pull type application. If yes what would be best pull up value  for 100 MHz data rate?

2. Will this level translator maintain slew rate same (5000V/us) at output side if input side slew rate is 5000V/us or is there any deviation in slew rate at output side ?

3. What should be ideal difference between  Vref_B power and Vref_A power to achieve 100 MHz bandwidth/Data rate ? We need this level shifter for down translation from 3.3V to (0.8V to 2.5V) translation with 100 MHz data rate.

4. Is propagation delay mentioned as Typical value is measured at 25 Degree C temperature?

5. Can you please provide SPICE Model for this device to simulate the performance.

Best regards

  • 0
    TI__Mastermind 40846 points

    Hi Ishwar,

    1. What is the interface of your signals? While 100MHz is achievable, it requires very strong external pullups and small output Cload to achieve this speed. This would also result in higher current draw as the current sink through VREFA / VREFB and the external pullups would be quite large, and a rise in VOL would also be as a result. I would suggest using an alternative translator altogether, such as the TXV0106 or the AVC4T245 instead. These translators are fixed direction/ direction controlled and have CMOS outputs supporting higher speed capabilities. 

    2. The external slew rate is dependent on the external RC circuitry. Similar to the answer provided for #1, the strong external pullups and low output Cload will be needed to be used to achieve faster output slew rates. The reason for this is because the LSF does not have any internal buffering circuitry. 

    3. Can you provide a schematic or more application details for this 0.8V to 2.5V translation at 100MHz? 

    4. Yes that is correct. 

    Regards,

    Jack