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SN74LVC112A togger function abnormally

Dear Team:

  If the JK set high, we expect toggle only at clk falling edge.

But SN74LVC112 also toggle at clk rising edge.

Whether we confused  SN74LVC112 toggle funciton?

As below is circuit / setting and measured waveform (red line is our expect waveform).

  • Hi Thomas,
    First, if pins 10, 11, 12, 13, and 14 are unused, you should ground those to avoid floating inputs (which can cause erratic behavior and excessive current draw)

    Next, can you take a scope shot showing pins 1, 4, 5, and 15 together?