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Original question:

TXS0102: TXS0102 internal 10K resistor variation.

TXS0102: Adding External Pull Up to achieve > 2 Mbps with Push-Pull input

Sal LaRussa
Genius 9970 points
Part Number: TXS0102

Hi,

can we add an external pullup in parallel with the on-device 10K to run faster than 2 Mbps?   What dictates the 500 ns pulse duration spec'd?  Isn't this primarily a factor of the external capacitance present at the device input or is this some how related to the One-shot accelerator in the device?  Along the same line, why is this spec so dramatically improved by using a push-pull driver?

Thanks,

Sal

  • 0
    TI__Mastermind 45725 points

    Hi Sal,

    May I ask what application you are using this device for in which you need faster than 2 Mbps? The data rate dictates the 500 ns pulse width (1/data-rate). Push-pull data rate is faster since the high-side driver will have a lower resistance than 10K (much lower). This will allow for faster rising edge transition rates and in turn, faster data rate. You are correct that the capacitance affects the transition rate which is why the datasheet puts emphasis on having a good layout. Adding an external pull-up can indeed increase data rate, but it will also affect the VOL levels so care must be taken when doing so.