• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 18 subscribers
  • Views 192 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CD74HCT221: CD74HCT221E Logic Diagram

Scott Taylor
Prodigy 120 points
Part Number: CD74HCT221

There is an error in the logic diagram. I know usage is on the decline and that Harris, or RCA before them, probably made the original error but I thought I would report it anyway. The A and B inputs are both driving the same line. One of the NOR gate inputs is not driven. The polarity of the A and B inputs is the same. A diagram is below showing what I think it should look like.

  • 0
    TI__Mastermind 26878 points

    Hey Scott,

    Thanks for bringing this up and letting us know. As you said this is an old Harris device so it will take a significant amount of time and resources to 'modernize' this and fix the mistake. While this is an error, it's a fairly small one that doesn't effect the proper usage for a vast majority of our customers. 

    I've added this to our internal tracking system to be reviews and updated in the next update of this datasheet. However, I'm marking this as low priority so it could take a long time before the issue is reviewed, fixed and implemented.

    Thanks,
    Rami