I am using a hex 2input NOR gate IC (TI SN74AS805BN). NOR Datasheet with a 5V regulated supply
I want this to control a power mosfet switch Vishay FB180SA10B MOSFET Datasheet. The problem is that the NOR gate high level (i.e. logic '1') Voltage output is apparently as low as 2V, and for the MOSFET to act in its saturation region, a Vth of up to 4V must be exceeded. I am constrained for board space and don't just want to amplify the signal.
So was thinking of using another MOSFET with its gate controlled by the logic output, to switch the bigger power Mosfet, by just connecting my 5V supply to the drain of the first MOSFET and the source connected to the gate of the power MOSFET, but get the feeling that this is bad practice. 1: Is this so?
Alternatively I was thinking of having the MOSFET pulling down the output when conducting in series with a resistor (ie a resistor pulling up) as in the simplest MOSFET switch. In the Logic stage I could possibly deal with the inversion to the power MOSFET gate that this would cause, but, 2: I was wondering what the recommendations would be for the most elegant solution.
Or 3: Am I just reading the NOR IC datasheet wrong?
Thank you so much!