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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You can achieve the same externally in your PCB design, very easily albeit with a lower density, you’re right. 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.
Thanks for the reply. Most MCUs inputs can’t be configured with internal pull-downs, only with pull-ups.
Given the available info, this is probably the correct answer. SNN simply has all of its reset inputs internally connected.
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While not the ideal eatasheet the approach here simple, cheap and reliable circuit, with only the MCU as “critical complexity”I believe that your comment may deserve an answer by itself for posterity. No system this complex has shown up on this site.
Home Questions Tags Users Unanswered. 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, datxsheet me to use more ICs.
Enric Blanco 4, 5 11 The most complex part by design is planned to be the MCU. I have toyed briefly with the possibility to use the Enable line, but was not sure if it would have cleared the latched states. I would disagree, but I may be missing daatsheet picture here. You will datasheeet need pull-ups on every output instead of pull-downs, so just use the pull-ups of the MCU inputs by configuring it accordingly.
So you may then want to consider another alternative. Can’t yet wrap my head around applying a D or JK that way. You matter to me! See line 1 of the question, it suggests the OP’s considered that.
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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.
Thank you all for your help! Look for “Wake-up on pin change”, not interrupt. Historical anecdotes on my other uses for RS latches. But I guess that the restrictions were far more 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.
Sign up using Email and Password. The shortcoming is that I have 4 separate resets, while ideally I would need only one.
You can derive a similar deduction for CD Looks like an SR is my only choice here, but my brain is just a drop of the ocean. Backup question maybe deserving its own question: For this reason is important that the circuit is able to record a state change even if brief without any clock or external intervention.
Sourcing it could be really troublesome. Sign up using Facebook. Path-wise, the design difference wouldn’t look enormous, but would still be an improvement: As has been said, you can make this function from more 74HCT-etc gates. However is practically impossible to find good supply of it and even a datasheet. 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. 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.
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. Zio Stampella 8 3. If you look at the truth table of CD 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.
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Email Required, but never shown. 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. Hi, thanks for the reply! Any suggestion on how to implement this otherwise? For this to work you need a pull-down resistor on every output.
EDIT — to clarify a few points in the design: