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SN74LVC1G123: timing resistor max

John Larkin
Prodigy 120 points
Part Number: SN74LVC1G123

Tool/software:

The data sheet does not state a maximum value for the timing resistor. Some graphs have a 200K curve, but don't say if that's the maximum.

What is the max allowed resistor at Vcc = 3.3V?

Thanks

  • 0
    Guru 316760 points

    In theory, there is no limit. In practice, you should not go higher than the graphs because the various leakage currents in your circuit will become noticeable and affect the charge time. (And the actual leakage currents depend very much on the temperature and the capacitor's architecture; to determine them, you'd have to measure yourself.)