Lead Small Outline Integrated Circuit (SOIC), JEDEC MS, Narrow 74LS Truth Table. Note 2: BI/RBO is wire-AND logic serving as blanking. SN74LS47N. SN74LS47NSR. ACTIVE. SO. NS. Green (RoHS. & no Sb /Br). CU NIPDAU. LevelC-UNLIM. 0 to 74LS SNJAJ. ACTIVE. Part Number: 74LS47, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor.

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Click here to register now. For a better experience, please enable JavaScript in your browser before proceeding. Counter using 74LS90 and 74LS Thread starter MattAyers Start date Mar 20, MattAyers New Member Mar 20, Hi, I’ve been trying to build this circuit: Russlk New Member Mar 20, Your 74ls90 is Datasjeet, but on the 74ls47, pins 3, 4, 5 should be tied high.

I’ve tried that, I’ve just modelled this circuit: Sebi Active Member Mar 20, Samcheetah, the logic inputs always need H or L level. Dahasheet floating input many times work as H, but very sensitive for disturbances.

Counter using 74LS90 and 74LS47 | Electronics Forum (Circuits, Projects and Microcontrollers)

I would put or instead of 4k7. MattAyers New Member Mar 21, Status update Hi, I haven’t made much progress on Multisim but have the circuit laid out on a pcb which kind of works but seems quite random! But I think the randomness could be down to my old power supply that barely gives out enough current to power one ic let alone the pair! To count with the ix I’m simply connecting pin 14 of the ic 74ls90 to -ve which isn’t the best of methods so could be that.

One thing I find quite strange is that everything seems to be connected to everything else, well almost – if I do a continuity test.

Full text of “IC Datasheet: 74LS47”

I’m not very experienced with electronics, so would be great to hear any reasons as to where I might be going wrong. Here’s a pic of my current project: Sebi Active Member Mar 21, For proper work You need proper signal source. When You make a contact with wire or pushbutton, it is many pulses for counter input.


Use a simply debouncing cct. MattAyers New Member Mar 22, Update I got the circuit working, the problem why it was only displaying a 9 and a 0 was because 2 of the output leads were connecting underneath where i could see.

Must have been the outputs Q0 and Q3 to give the 7 segment display driver the value of 9! Still haven’t had any success on electronics workbench – something funny there! If anyone needs information on the circuit or just general hints and tips feel free to contact me, I’m thinking of setting up a simple electronics website when I have the time out of college. I believe his IC is 47ls but I could be wrong. If I don’t get any response here I may make a new post so if you think you’re seeing double you probably are.

Thanks for all of your help!

Counter using 74LS90 and 74LS47

Digimaniac New Member Mar 22, The Same Design 74ls477 different purpose Hey Guys, I made the same design of this circuit but for the purpose to use it as a digital clock so the first part of the seconds consists of the your design exactlyfirst the pins of the 74ls473, 4 and datasueet can left open or joined to the VCC it doesn’t make sense and I experimented both ideas, but I had another Idea if you can help me it will make me more thankful.

PLease I wanna make the 74ls90 work as a Decade 6 Counter if you got any idea about datasehet please inform me. Hi Digimaniac, I have a feeling, reading through the 47ls90 pdf file that you can use the ic 47ls92 as a decade counter, and it may be easier to use that.

But the other way that comes to mind is resetting the chip when the count reaches 6, eg: MR1 pin 2 and MR2 pin 3 Hope that helps! The circuit that you have been trying to build worked fine on the old electronics workbench but doesn’t off to work on the new one! I would try and build the circuit practicaly and see how it goes.


Your circuit does not appear to have any bypass capacitors. These are essential in order to avoid odd behaviour due to coupling via the supply line.

A nF ceramic is sufficient across every second IC. Also, you mean a Modulo 6 counter, not a “Decade 6”. A decade counter is a Modulo I’m trying to understand how I can set my own sequence of numbers with a 74ls90 decade counter and 74ls47 BCD to seven segment decoder.

I’ve datashdet to understand to understand to figure out how to reset a count if the numbers are consecutive 0. I’m been playing with it for sometime and tried the net but couldnt find anything specific.

If somebody knows and if they could explain it to me, that would be great. Barry New Member Datashfet 12, Hi all, I found a good schematic for a four decade counter using IC’s with a switch debouncing circuit as well. It does not use the same IC’s as in this discussion but you can add as many seven segment displays as you want.

The IC only drives common cathode seven segment displays and the nice part here is that only one IC per display necessary. If you are interested the project is at: My problem is related to these components.

Mr Replay New Member Nov 28, I built that circuit in electronics worbench and it acts like crazy. You must log in or register to reply here. Pioneer Elite vsxtx water damage no power Started by Watin Today at Replacement Transformer Started by ncag Today at 7: Datasheets, Manuals or Parts. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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