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SN74LVC1G17-Q1: Calculate Voh with different VCC and Ioh

Mark Malik
Prodigy 210 points
Part Number: SN74LVC1G17-Q1

For worst case analysis, how can V(oh) be calculated for different V(cc) and different I(oh)?  A specific example would be V(cc) = 3.3V nominal and I(oh) is 0.5mA.  Thank you.

  • 0
    TI__Mastermind 45725 points
    Hi Mark,

    To get a good estimate for VOH or VOL, you just use the datasheet values to determine the output driver’s resistance, then VOH = VCC – IOH*ROH
    And VOL = IOL*ROL

    For that example: ROH = (VCC – VOH)/IOH = 0.7/0.024 =~ 29.17 ohms
    VOH = 3 V - (.00005*29.17) = 2.985 V

    This will be the best estimate for worst case, you most likely will see less of a voltage drop.