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CD4536B glitch issue

Frank D'Aliesio
Intellectual 715 points
Other Parts Discussed in Thread: CD4536B

I have a customer that is thinking of using the CD4536B for a safety critical application but has heard that there may be a condition that can occur where an intermediate step can makes it way to the output and give an incorrect value at the output for a short duration.  Has anyone out there heard of such a situation and if there is any workaround or fix?

Thank you,

Frank

  • 0
    TI__Mastermind 46480 points

     

    This is my part.  I have not heard of any issues with wrong output under certain conditions. I googled it and also found nothing to indicate this.

    I have not heard of any issues with this part. If it is a critical app I would certainly test the conditions in question

  • 0 in reply to Chris Cockrill
    Prodigy 90 points

    There is, indeed, a problem with the CD4536B if used with the diagram shown as Figure 29 on the data sheet.  Upon application of power, the IC will cause a pulse transitioning from high to low on the DECODE OUT pin for the duration set up by the oscillator and timing selection pins.  There is no warning on the data sheet about this.  A solution is to put an RC timing network on pin 1 SET, with the capacitor to Vdd and the resistor to Vss.  This holds off the one shot action upon power up.  The value of the RC time constant is one you will have to work out for your particular circumstance, but it does work reliably.