SN74LVC1G04: Trigger level problem

Hello,

The SN74LVC1G04 has a standard CMOS input - meaning that it triggers at ~Vcc/2 and _should not_ have slow inputs as shown above. I'm guessing you are confusing V_IH (High-Level Input Voltage) with V_t+ (Positive-Going Input Threshold Level).  These specifications are not equivalent.

Also, the datasheet specifically lists the maximum input transition rise or fall rate (Δt/Δv) as 10ns/V at 3.3V operation -- the edge rate above appears to be ~50us, approximately 1500x slower than what the datasheet lists.  Such slow inputs can cause oscillation and damage as explained in this application report: Implications of Slow or Floating CMOS Inputs.  

There is an application report that explains each specification in detail located here: Understanding and Interpreting Standard-Logic Data Sheets