SN74AUC1G240: Start-up time of the inverter SN74AUC1G240

Hi Danilo,

The min Vcc for this device is 0.8V. So once the supply ramps past this state the device becomes active.There is not necessarily a setup time for this device. The Ten spec gives an idea of how long after device crosses 0.8V supply voltage before device outputs will get enabled from internal enable signal. But truth is that most likely this device will become active somewhere around 0.6V during supply ramp and so by the time you reach 0.8V the device is active.

As for a Vcc of 1.8V, my recommendation will be to not provide an input until supply voltage is stable as the supply voltage has an impact on the VIH and VOH voltages of the device.

Regards,

Karan

Hi Danilo,

Ten and Tdis are the enable and disable time specs under the switching characteristics table of the datasheet. But again as I mentioned previously, by the time your supply is stable at 1.8V Vcc the device will already be active.

Regards,

Karan