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SN74LVC14A: Can it be operated with a 5V interface?

Taito Takemura
Intellectual 2710 points
Part Number: SN74LVC14A
Other Parts Discussed in Thread: SN74LVC3G14, SN74LVC1G14, SN74AC14

Tool/software:

Hi team,

Looking at the data sheet for the SN74LVC14APWR, the recommended operating voltage range is 2V to 3.6V, suggesting that it is intended for use at a 3.3V level. Looking at the electrical specifications table, it is written that it is specified for up to 3.6V, so I believe it is intended for use up to 3.3VI/O

On the other hand, the maximum rating is 6.5V, and the output voltage is Vcc+0.5V, so it appears that the device can also operate with a 5V interface. If the power supply voltage is 5V, can I refer to the 3.6V specifications? Or is it possible to operate with a power supply voltage of 5V, but not guaranteed?

The SN74LVC1G14DRLR, a single-gate type with the same logic, has a recommended voltage range of 1.65V to 5.5V, and it is clearly stated that it is OK to use it at 5VI/O. Could you please tell me the differences between SN74LVC14APWR and SN74LVC1G14DRLR (single-gate type)?

 Thank you for your help

Regards,

Taito Takemura

SN74LVC14A datasheet (Absolute maximum and Recommended conditions) 

  • 0
    Guru 294230 points

    The absolute maximum ratings allow this, so the device will not be damaged.
    The recommended operating conditions do not allow this, so correct operation is not guaranteed.

    I suspect that the only problem is with switching many 5 V outputs at the same time. But again, there is no guarantee.

    Just use 2× SN74LVC3G14.

  • 0 in reply to Clemens Ladisch
    TI__Intellectual 2710 points

    Hi Clemens,

    Thank you for your information.

     

    - SN74LVC1G14  1ch 1.65V-5.5V

    - SN74LVC3G14  3ch 1.65V-5.5V

    - SN74LVC1G14  6ch  2V-3.6V

    Could you please explain why the voltage range of the SN74LVC inverter is different for each channel as shown above? Will a 6-channel product compatible with 1.6V-5.5V be released in the future?

    Thank you for your help.

    Regards,

    Taito Takemura

  • 0 in reply to Taito Takemura
    Guru 294230 points

    The SN74LVC14A actually supports 1.65 V.

    As I said, I suspect that switching six 5 V outputs at the same time would introduce too much noise. (The SN74AC14 does support 5 V. And AC devices are known to be noisy in these circumstances if you do not have perfect decoupling.)