CD40110B - couple of things the datasheets not clear about?

Graham Rounce

Hi - I have a few questions about this up/down counter, where the datasheet doesn't seem clear (or at least not clear enough for me!): What does the Toggle input do? For simple counting, should I hold the Toggle, Latch, Reset inputs high or low? If the CountUp input is used, should the CountDown input be held high or low, and vice versa? Thank-you very much, Graham Rounce

over 14 years ago

0 Chris Cockrill over 14 years ago

TI__Mastermind 46480 points

The toggle stops the count and locks the display. To count toggle enable would be low.

The unused clock could be high or low (dont float). I would hold it low.

0 Graham Rounce over 14 years ago in reply to Chris Cockrill

Prodigy 70 points

Thank-you. And Latch, and Reset? From the datasheet, it looks like Toggle is active-low, but Latch and Reset are active-high. Is that the case? Thanks again,

0 Chris Cockrill over 14 years ago in reply to Graham Rounce

TI__Mastermind 46480 points

Yes Both Latch and reset are active high.

0 Graham Rounce over 14 years ago in reply to Chris Cockrill

Prodigy 70 points

Ok, thanks.

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CD40110B - couple of things the datasheets not clear about?