Logic Gate Issues Using Analog Discovery

[KentCollins]

I am a teacher new to Analog Discovery.  I am attempting to use the Analog Discovery Module with Waveforms software to demonstrate the electrical behavior of typical logic gates (NAND, NOR, XOR, AND, etc.) to a section of high school seniors.  The IC chips that I am using have been tested with LEDs and push buttons and display the intended outcomes.  However, when I attempt to run logical patterns through the chips using ADM, logical lows on the output just appear to bounce around.

I am attaching files showing Logic, Pattern and Supplies screens.  Output is being measured by DIO2.  I have also tested the same connections by slowing down to 1Hz and .5Hz with the Static IO screen and the light (for NAND, for example) goes {on, on, on, flickers}, giving an equivalent output to that seen on the Logic screen.  The output from the NAND gate shown, below, uses an M74HC00 that works satisfactorily when LEDs and physical switches are used to control input signals.

Thoughts, ideas or suggestions?  

M74HC00B1_quad_2input_NAND.pdf

[attila]

According the IC datasheet with 5V VCC the minimum high level input voltage is 3.5V, but the Digital IO (0&1) provide only 3.3V.

Try supplying the IC from AWG at 3.3V or with logic high signal from other digital IO.

[KentCollins]

I'll try that and report back -- thank you

[KentCollins]

That fixed it.  I set a pattern on DIO3 to provide a constant high and used that as the power to the IC with perfect results.

Thank you.