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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I would disagree, but I may be missing the picture here. 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.

I had a sync.

SNN simply has all of its reset inputs internally connected. 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.

By using our cd44044, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Home Questions Tags Users Unanswered. Given the available info, this is probably the correct answer. 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.

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.

Is there a cd40044 why you have to use the fewest ICs?

CD 데이터시트(PDF) – TI store

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. Thanks for the reply. Fd4044 state change on the inputs would wake the MCU – whereupon it reads the inputs and then goes back to sleep.


You may be looking for this: Most MCUs inputs can’t be configured with internal pull-downs, only with pull-ups. See line 1 of the question, it suggests the OP’s considered that. Is the enable line capable of effectively “resetting” the latches?

Historical anecdotes on my other uses for RS 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.

Backup question maybe deserving its own question: Path-wise, datashest design difference wouldn’t look enormous, but would still be an improvement: For this reason is important that the circuit is able to record a state change even if brief without any clock or external intervention.

National Semiconductor CD Series Datasheets. CDBM, CD, CDBC Datasheet.

Can’t yet wrap my head around applying a D or JK that way. Their later comment says the MCU would be sleeping, before you posted your ‘answer’. If you look at the truth table of CD For this to work you need a pull-down resistor on every output.

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 that I have 4 separate resets, while datzsheet I would need only one. But I guess that the restrictions were far more Never say you are nobody! Look for “Wake-up on pin change”, not interrupt.

Looks like an SR is my only choice here, but my brain is just a drop of the ocean. 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.


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

Post as a guest Name. OTOH, you might way to use the common enable in the CD to implement the solution you’re looking for. Catasheet 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.

But you all know how it works The most complex part by design is planned to be the MCU.

EDIT — to clarify a few points in the design: You can achieve the same externally in your PCB design, very easily albeit with a lower density, you’re right. Thank you all for your help! However is practically impossible to find good supply of it and even a datasheet. I would probably need to contemplate it for quite some time to fully grasp it.

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. Sourcing it could be really troublesome. Sign up using Facebook. 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.

CD4044 Datasheet

As has been said, you can fd4044 this function from more 74HCT-etc gates. You matter to me! Following up my previous comment: No system this complex has shown up on this site.

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