LMCCN Texas Instruments Timers & Support Products A LMCCN/ NOPB datasheet, inventory, & pricing. LMCCN. LMCCN Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a. Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a trademark of National Semiconductor Corp.

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I have to admit I did have a moment of horror when you mentioned the 2mA output current – I just checked the datasheet of the SSR and found that the stated maximum forward current is 2mA I had originally thought it was 3mA hence my brief moment of panic!!! Malware on Android Devices Mimics Hardware Specs and Wastes Billions of Dollars Ever wonder why so many Android apps ask users if they’d like to download obscure add ons like “smart charging”?

Jun 23, 4. Once the circuit is powered it will then be left alone maybe for a couple of hours without any further intervention.

The Cmos has a very low output high current especially when its supply voltage is only datasheef. Or will there be something I need to add such as a resistor to ensure the SSR does turn off? Its output high voltage is spec’d with an output current of only 2mA which might not be enough to turn on your solid state relay.

It isn’t to improve your user datashheet. I’m planning on having 2 relays in series – one will trigger and simulate the space bar being pressed, one relay will light up an LED and the other will simply just close an external circuit for external expansion one of these relays are a dual SPST relay hence 2 relays!


I’ve attached a schematic of the actual circuit below but without a few modifications that I’ll mention later. You gave a lot of info, but I have to admit I’m still confused, so break it down. You May Also Like: An ordinary has an output high voltage spec’d with an output current of mA when its supply voltage is only 5V. Dec 20, 10, 1, Quote of the day.

Do you already have an account? Yes, my password is: Also, if there is an easier way to accomplish the same task please let me know I’m all ears!!!

Lmcc555cn name or email address: Jun 23, 1. I’m attempting to make up a circuit that will trigger a key press on a keyboard with the help of a solid state relay.

LMCCN National Semiconductor, LMCCN Datasheet

Jun 23, 2. After re-reading my post it looks like I completely forgot to mention how I’m going to use the timer!! Help with timer circuit please! Jul 22, 10 0.

National Semiconductor – datasheet pdf

There’s times when I just can’t quite explain things simply and something tells me this could be one of those times so apologies if that’s the case!! Hi Bill, thanks for the extremely quick reply!!

So far, after about 2 days trawling through both Google here for inspiration I’ve come up with the circuit below but with a few modifications.

The supply current spike from a Cmos operating at your low supply voltage is tiny compared to pmc555cn up to mA supply current spike caused by an ordinary Jun 23, 5.

National Semiconductor

No, create an account now. Usually you would just set the slides to automatically advance and set them to loop. Mar 24, 21, 2, I’m hoping I’ve included enough info here but if I’ve omitted anything let me know!!! For R1 I’ve decided to use a variable resistor finding a I’m trying to get the output to go low for 3 to 10 seconds which I’m hoping can be tweaked by the potentiometer and then I’m aiming for a mS duration for when the output goes high I pulled this figure out of thin air as I’ve really no idea how long to make the simulated key press – it just seemed to fit!


How long to you want this timer to work in secondsand what are you using to trigger it a push button? Hi all, First up, my apologies for another thread as I can’t find a similar thread to tag onto Also, which type of capacitors should I be using for my project – tantalums, ceramic or electrolytic as I am a complete novice!

Thanks again for taking your time to reply! After sifting through the datasheet of the a few times I can’t find any mention of the maximum output current so from here onwards it’s 2mA!

HELP with timer Posted by itel in forum: I’ve lost track of what I’ve read where but I did read something about having a capacitor as a supply bypass due to spikes from the when it changes state. How to Reduce Ground Bounce: As the power is being tapped off the USB port in parallel to the keyboard am I guessing correctly that it would be a good idea to include this bypass and, if so, what capacitor should I use?

So in a nutshell, my plan is to make this timer press the space bar at predetermined intervals Hopefully I haven’t made things more confusing than they were before!!

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