[Solved] Unexpected output voltage

0ussama Asks: Unexpected output voltage
I am using the HD74LS14P (Schmitt trigger inverter IC.)

The datasheet show that VOH is 2.7 V (for VCC = 4.75 V.) My IC gives me about 4.5 V when VI=0 V.

I need my IC to give the right value.

I am using a Rasberry Pi which uses 3.3V as input voltage.

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