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SN74LVC1G14: behaviour at VCC=0V

HS FAE Germany
Mastermind 32240 points
Part Number: SN74LVC1G14

Hello,
how does the SN74LVC1G14 behavior in case of VCC=0V and Vin=3.3V? Is this allowed?

Customer needes the min/max values for ∆VT Hysterese (VT+ - VT-) Vcc=3.3V (datasheet page 6, chapter 6.5). Can you give me the values.

Regards, Holger

  • 0
    TI__Guru* 97046 points

    Hello,

    The case of VCC = 0V and Vin = 3.3V is defined in the electrical characteristics table:

    The input and output are in high-impedance if the supply is 0V. The input can be up to 5.5V.

    For ∆VT Hysteresis (VT+ - VT-) at 3.3V, I would recommend determining this value at the supply limits for the customer.  For example, if their supply has a 5% tolerance, you can use linear interpolation to find the values as shown here:

    Then the worse case for each spec should be listed. For example, VT+(max) is the worst at +5%, so teh value of 2.1397 would be used.

    Here's the linear interpolation file I created for this:

    linear_interpolation_v2.xlsx