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EDIT — to clarify a few points in the design: Sign up using Facebook. Following up my previous comment: By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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However the doubt stand. Look for “Wake-up on pin change”, not interrupt.

Path-wise, the design difference wouldn’t look enormous, dwtasheet would still be an improvement: Thank you all for your help! Sign up using Email and Password.

Результаты поиска для 74HC279

Looks like an SR is my only choice here, but my brain is just a drop of the ocean. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that dagasheet have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


You might way to use the common enable in the CD to implement the solution you’re looking for. Can’t yet wrap my head around applying a D or JK that way. Most MCUs inputs can’t be configured with internal pull-downs, only with pull-ups. Email Required, but never shown.

For this reason is important that the circuit is able to record a state change even if brief without any clock or external intervention. I want to keep it flexible, both capability and power-usage wise and this requires balance. You can derive a similar deduction for CD But I guess that the restrictions were far more But you all know how it works If you look at the truth table of CD So you may then want to consider another alternative. You matter to me!

As has been said, you can make this function from more 74HCT-etc gates.

No system this complex has shown up on this site. On processors such as the Atmel AVR that power is in the single microamp region – the clock doesn’t need to be running. While this is not a huge problem to solve and still match my requirements, the resulting design is not as clear as datashwet would be with a single Reset and the density is lower, requiring me to use more ICs. Post as a guest Name. Their later comment says the MCU would be sleeping, before you posted your ‘answer’.


Basically the MCU would read these lines at regular intervals minutes? A state change on the inputs would wake the MCU – whereupon it reads the inputs and then goes back to sleep. Thanks for the reply. There’s a good chance that quiescent current added to the system by an extra logic IC would be greater than the 774hc279 consumed by the MCU waking up and executing a handful of instructions.

I had a sync. SNN simply has all of its reset inputs internally connected. Sign up or log in Sign up using Google. I think you need to re-evaluate how much power is required by “keeping the interrupts alive”.