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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For this to work you need a pull-down resistor on every output. You might way to use the common enable in the CD to implement the solution you’re looking for.

Following up my previous comment: Home Questions Tags Datqsheet Unanswered. The most complex part by design is planned to be datashet MCU. For this reason is important that the circuit is able to record a state change even if brief without any clock or datasyeet intervention.

Can’t yet wrap my head around applying a D or JK that way. There’s a good chance that quiescent current added to the system by an extra logic IC would be greater than the satasheet consumed by the MCU waking up and executing a handful of instructions. Looks like an SR is my only choice here, but my brain is just a drop of the ocean. Is the enable line capable of effectively “resetting” the latches?

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. 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.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. You will then need pull-ups on every output instead of pull-downs, so just use the pull-ups of the MCU inputs by configuring it accordingly.

74HC datasheet, 74HC datasheets, manuals for 74HC electornic semiconductor part

Is there a reason why you have to use the fewest ICs? So you may then want to consider another alternative.

I think you need to re-evaluate how much power is required by “keeping the interrupts alive”. Basically eatasheet MCU would read these lines at regular intervals minutes? You may be looking for this: Why does this work?

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The reason why I was looking at concentrating everything in Hex Latches instead of Quad Latches was to reduce the IC count and, with this, to have a cleaner design of the traces. The shortcoming is that I have 4 separate resets, while ideally I would need only one. I want to keep it flexible, both capability and power-usage wise and this requires balance.

Sourcing it could be really troublesome. But I guess that the restrictions were far more Sign up or log in Sign up using Google. Any suggestion on how to implement this otherwise?

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. You can achieve the same externally in your PCB design, very easily albeit with a lower density, you’re right.

Hi, thanks for the reply! To conserve bandwidth, I only needed 1 bit in a synchronous “sub-frame” channel to send the analog signal as a digital FM signal of 0 to 1kHz. The way I plan to implement it the MCU could well stay sleeping all the day, until the measurements are taken and the SR reset.


I am working on a circuit where I need to hold a few signals until my MCU reads them. You matter to me! A state change on the inputs would wake the MCU – whereupon it reads the inputs and then goes back to sleep.

I have toyed briefly with the possibility to use the Enable line, datashet was not sure if it would have cleared the latched states. No system this complex has shown up on this site. On top of that, when I will get into power-optimization for the MCU I may end up having to choose between keeping the interrupts alive or saving power. Post as a guest Name. 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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EDIT — to clarify a few points in the design: Given the available info, this is probably the correct answer. Most MCUs inputs can’t be configured with internal pull-downs, only with pull-ups.

74HC Datasheet, PDF – Alldatasheet

Enric Blanco 4, 5 11 Tony EE rocketscientist Any way, take into account that the SNN has been obsolete for 25 years, its not a good idea to even consider that part for a new design. You can derive a similar deduction for CD Sign up using Facebook.

If you look at the truth table of CD SNN simply has all of its reset inputs internally connected.