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CD4071B Reliability Question

Other Parts Discussed in Thread: CD4071B

Hi All,

We have a question regarding the CD4071B.  We needed to add a 0.01uF capacitor before one of the inputs, slowing the positive transition down to 100 us, but we're worried about damaging the part to due meta-stable operation since it’s not a Schmitt trigger.  Is there a reliability concern here?

Thanks,

Ethan

  • The considerations in Implications of Slow or Floating CMOS Inputs (SCBA004) apply.

    I'd estimate that the shoot-through currents are small enough for the allowed 500 mW package power dissipation. However, only the output transistors are actually meant to handle larger currents for a long time, so this still doesn't look good.

    There certainly is no guarantee. I'd never design such a system without a Schmitt trigger.