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Doubt of logic gates of the family LVC/ALVC

Martin Chipiluk
Prodigy 20 points

Dear Engineer Texas Instruments

I writing to you the subject of logic gates of the family LVC/ALVC.

I need to know if is VOH (output) to 2.4 V at high level (3.3 Vdd) as fixed. Is that true?

I doubt that 3.0 V is the maximum value of VOH in 3.3 Vdd with very low current as less than 2 mA.

I await your response

Without more, I take this opportunity to greet it.

Attentively.

Technical Martin Chipiluk

 

  • 0
    Mastermind 7395 points

    VOH is NOT fixed, it depends on output current, and it also depends on which device you use. A buffer is very different than a logic gate.

    For a logic gate, and according the datasheet, for low currents of 100uA, VOH > VCC-0.2V for any VCC bigger than 1.65V.

    I didn't see a measurement for Iload = 2mA for the 74LVC00. There are measurements for Vcc = 3V, Iload = 12mA and 24mA.

    I made a linear approximation in Excel and the results are that for Vcc = 3V, I load = 2mA, VOH should be around 2.6V. For Vcc=3.3V, it should be higher, I think that around 2.8-2.9V.

  • 0 in reply to Avi Chami1
    Prodigy 20 points

    Albert_83 said:

    VOH is NOT fixed, it depends on output current, and it also depends on which device you use. A buffer is very different than a logic gate.

    For a logic gate, and according the datasheet, for low currents of 100uA, VOH > VCC-0.2V for any VCC bigger than 1.65V.

    I didn't see a measurement for Iload = 2mA for the 74LVC00. There are measurements for Vcc = 3V, Iload = 12mA and 24mA.

    I made a linear approximation in Excel and the results are that for Vcc = 3V, I load = 2mA, VOH should be around 2.6V. For Vcc=3.3V, it should be higher, I think that around 2.8-2.9V.

     

    Hi Albert_83

    Thanks for your reply.

    I have studied all the data sheet of 74LVC/74ALVC because I needed a characteristic of 3,3 V.

    I have no special program for analysis of logic gates.

    Before begin to use the 74LVC/74ALVC new IC's (3,3 V only) for working to high-speed.

    T.I. recommended that the LVC/ALVC family operates at high speed with 3.3 V because the 74AHC family no serves by the poor performance.

    Regards.

    Technicial Martin Chipiluk