The CDBC are quad cross-couple 3-STATE CMOS. NOR latches, and the CDBC are quad cross-couple STATE CMOS NAND latches. Each latch. Data sheet acquired from Harris Semiconductor. SCHSC – Revised March The CDB and CDB types are supplied in lead hermetic. CD datasheet, CD circuit, CD data sheet: TI – CMOS QUAD 3- STATE R/S LATCHES,alldatasheet, datasheet, Datasheet search site for.
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EDIT — to clarify a few points in the design: 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 answer by itself for posterity. I had a sync. As far as possible I want to keep it digital and without any high frequency line anywhere or, better said, well confined in their own “realm”: The shortcoming is fatasheet I have 4 separate datashdet, while ideally I would need only one.
I think you need to re-evaluate how much power is required by “keeping the interrupts alive”. You matter to me!
The CD is indeed the one I have in the design now. 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.
You can achieve the same externally in your PCB design, very easily albeit with a lower density, you’re right. Tony EE rocketscientist I am working on a circuit where I need to hold a few signals until my MCU reads them.
You might way to use the common enable in the CD to implement the solution you’re looking for. I would disagree, but I may be missing the picture here. Can’t yet wrap my head around applying a D or JK that way. Look for “Wake-up on pin change”, not interrupt. 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. But I guess that the restrictions were far more As has been said, you can make this function from more 74HCT-etc datashset.
You will then need datashert on every output instead of pull-downs, so just use the pull-ups of the MCU inputs by configuring it accordingly. Home Questions Tags Users Unanswered. Why does this work? A state change on the inputs would wake the MCU – whereupon it reads the inputs and then goes back to sleep. However the doubt stand.
Post as a guest Name. Hi, thanks for the reply!
Their later comment says the MCU would be sleeping, before you posted your ‘answer’. Is the enable line capable of effectively “resetting” the latches? 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. I have toyed briefly with the possibility to use the Enable line, but was not sure if it would have cleared the latched states.
Is there a reason why you have to use the fewest ICs? 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.
Backup question maybe deserving its own question: 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. If you look datashet the truth table of CD 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.
So you may then want to consider another dataseet.
CD 데이터시트(PDF) – TI store
Most MCUs inputs can’t be configured with internal pull-downs, only with pull-ups. 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. MCU, comms module and voltage regulation sections. You may be looking for this: Sign up using Email and Password.
You can derive a similar deduction for CD No system this complex has shown up on this site. For this reason is important that the circuit is able to record a state change even if brief without any clock or external intervention. 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.