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CD14538B: Internal comparator behaivor

Part Number: CD14538B

Hi

I've been studying the internal operation of the CD4014538 dual monostable.

I have a question on the two internal comparator's.

Do the comparators have a "latch" function and/or a enable function?

If so, how does it work?

thanks

  • Hi,
    I can see how the logic diagram provided on the datasheet could be confusing - there's multiple arrows going into the top/bottom of the comparators that really don't have any described behavior. I guess that Harris semiconductor (the original manufacturer or this device) thought this made perfect sense....

    Unfortunately, the internal structure and function of our devices are protected IP, and I won't be able to share any details of the internal structure of the device. Hopefully this doesn't stop you from attempting to figure out the function for yourself from the provided logic diagram. I would recommend working backwards - what makes sense to produce the monostable function?
  • HI

    Thanks for you reply.

    I seems strange that a company would post a logic diagram that isn't logical. I only say that because a diagram can't be called logical unless its behavior can be analyzed and proven logical. :-|

    Anyway...I worked out the timing and trigger part and now am trying to figure out how the retriggering works. I don't see on the diagram how the comparator can be reset by a second input trigger

    if the FF is already latched. Must be some other stuff missing...

  • Not enough information provided by TI.