74HC04 hex inverter (14-pin IC, Pin 14 - Vcc, Pin 7 - GND, Pins 1,3,5,7,8,10,12 - Input, Pins 2,4,6,9,11,13 - Inverted Output) is not performing as mentioned in HMC424A datasheet.
I have tested as follows
Pin 7 - -5V
Pin14 - 0V
Pin 1 - +V and 0V
Pin 2 - Expected output should be 0V and +V respectively but the output is -5V at both logics.
The supply and control voltages shall be negative related to the 0V=GND for the HMC424A. Thus the supply of 74HC04 shall be 0V / -5V also and the output voltage cannot be positive. Necessary voltage shift for 74HC04 is ensured by Zener diode with Vz=~5V.
We have made the test setup as figure shown below and the test results are tabulated below.
CMOS Input (VDC)
Inverter Output (VDC)
When given +5V as input, what should be the expected output 0V or -5V?