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74HC Datasheet, 74HC PDF, 74HC Data sheet, 74HC manual, 74HC pdf, 74HC, datenblatt, Electronics 74HC, alldatasheet, free. 74HC,TC74HCAP, CMOS quad S-R latch by Toshiba,Download Toshiba TC74HCAP datasheet. SN74LSA. (ACTIVE) Quad /S-/R latches. Datasheet ( KB). Description click to collapse contents. The ‘ offers 4 basic S\-R\ flip-flop latches in one.

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The shortcoming is that I have 4 separate resets, while ideally I would need only one. 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. SNN simply has all of its reset inputs internally connected.

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 am working on a circuit where I need to hold a datasyeet signals until my MCU reads them. Looks like an SR is my only choice here, but my brain is just a drop of the ocean.

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I want to keep it flexible, both capability and power-usage wise and this requires balance. Hi, thanks for the reply!

You may be looking for this: As far as possible I want to keep it digital and without any high frequency line anywhere or, better datsaheet, well confined in their own “realm”: Any suggestion on how to implement this otherwise? Enric Blanco 4, 5 11 You can achieve the same externally in your PCB design, very easily albeit with a lower density, you’re right. MCU, comms module and voltage regulation sections.

Yeah, looked at the D and JK logic, but that would require providing clock and wouldn’t be an “unattended” design as I plan to implement. Is the enable line capable of effectively “resetting” the latches?


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Given the available info, this is probably the correct answer. Post Your Answer Discard 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. While not the ideal for the approach here simple, cheap and reliable circuit, with only the MCU as “critical complexity”I believe that your comment may deserve an datasheeet by itself for posterity.

On processors such as the Atmel AVR that power is in the single adtasheet region – the clock doesn’t need to be running. I have toyed briefly with the possibility dwtasheet use the Enable line, but was not sure if it would have cleared the latched states.

I would disagree, but I may be missing the picture here. Any way, take into datasheeet that the SNN has been obsolete for 25 years, its not a good idea to even consider that part for a new design.

Why does this work? You can derive a similar deduction for CD There’s a good chance that quiescent current added to the system by an extra logic IC would be greater than the current consumed by the MCU waking up and executing a handful of instructions. Basically the MCU would read these lines at regular intervals minutes?

EDIT — to clarify a few points in the datasheeg I would spare the fixed via to the enable having it routed to the MCU and used to control the reset AND the enable itself and would have all the resets linked together in a clean way.

Thank you all for your help! On top of that, when I will get into power-optimization datsaheet the MCU I may end up having to choose between keeping the interrupts alive or saving power. So you may then want to consider another alternative.

The most complex part by design is planned to catasheet the MCU. But I guess that the restrictions were far more Home Questions Tags Users Unanswered. Can’t yet wrap my head around applying a D or JK that way. While this is not a huge problem to solve and still match my requirements, the resulting design is not as clear as it would be with a single Reset and the density is lower, requiring me to use more ICs. Comments like these are one of the many reasons for which I regret skipping all the theory in the electronic classes and being in the first line only when there was the risk to toast stuff.


However is practically impossible to find good supply of it and even a datasheet.

Backup question maybe deserving its own question: In this scenario a common reset channel on the IC would help maximizing the numbers of available latches in the same footprint and make the circuit more elegant and simple. I would probably need datzsheet contemplate it for quite some time to fully grasp it.

OTOH, you might way to use the common enable in the CD 74hc27 implement the solution you’re looking for. A state change on the inputs would wake the MCU – whereupon it reads the inputs and then goes back to sleep. As has been said, you can make this function from more 74HCT-etc gates. For this to work you need a pull-down resistor on every output.

Zio Stampella 8 3. If you look at the truth table of CD You might way to use the common enable in the CD to implement the solution you’re looking for. Most MCUs inputs can’t be configured with internal datasheett, only with pull-ups. See line 1 of the question, it suggests the OP’s considered that.