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SN74LVC2GU04 Failure Modes

Daniel Sweeney
Prodigy 50 points
Other Parts Discussed in Thread: SN74LVC2GU04

Hi,

I'm working on a design that involves a PWM signal with a carrier frequency of ~1-3MHz  0 and 5V and I've been trying to use the SN74LVC2GU04 to invert the signal. I've scoped the input to the SN74LVC2GU04 inverter, and the PWM signal I've created is being delivered correctly, but the output from the inverter is railing high at 5V. I can't see any portion of the input signal in the output and I'm concerned I might have blown the inverter. Is this an accurate diagnosis or is there another problem that I'm missing. I was wondering if the input to the inverter has an internal pull-down resistor on it that might be making it act this way. Any help would be greatly appreciated.

Thanks!!!

Inverter Input:

Inverter Output:

  • 0
    TI__Mastermind 46480 points

    Hi Daniel

    It looks like th part may be damaged. Why are you using the unbuffered part?  U04

    There are no internal pull resistors.

  • 0 in reply to Chris Cockrill
    Prodigy 50 points

    Hi Chris,

    I didn't have a reason for using the unbuffered part and I guess I must have missed that when I was reading through the data sheet. I got the inverter switching correctly this morning, but when I try to drive a higher voltage  down-stream on another part (as in 500V), the inverter keeps blowing. I've replaced it a couple of times and this trend continues each time I try to hook up the high-voltage, but works when at lower voltages (30V) are applied to the high voltage rails at the high-voltage side of the board. Would a buffered component fix this issue? I don't think I have any shorts in my board that would cause some over-voltage damage, but I'll double check. 

    Thanks!

    Dan