SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL. SDLS – DECEMBER – REVISED MARCH 3. POST OFFICE BOX . datasheet, pdf, data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Up/Down Counter with Mode Control. Category. Description, Synchronous 4-bit Up/down Counter with Mode Control. Company, Fairchild Semiconductor. Datasheet, Download datasheet.
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Discussion in ‘ The Projects Forum ‘ started by cupcakeOct 8, Oct 8, 1. Sep 20, 73 0. I have read the datasheet, but I still don’t quite understand how it works. Suppose, I have an input value, and I want to make counts it, three times, then terminated. Oct 8, 2. Mar 24, 21, 2, The dtasheet are just that, you can start it from a specific number instead of zero.
CMOS has a very similar chip, they are very useful for clocks. Oct 8, 3. Oct 8, 4. Jul 26, 2, Oct 8, 5. Oct 8, 6. Try looking for a different chip? There’s bound to be something out there that will do exactly what you’re wanting.
Datasheet(PDF) – National Semiconductor (TI)
Oct 8, 7. Here is the datasheetwhich should always be your starting point. You can put any binary number on the load inputs. When the load input pin 11 is taken low the number is entered into the registers, therefor the load input should normally be high. There is no reset pin, which means you need to load into the presets pins 15, 1, 10, 9 and toggle load.
A simple combination of inverters and a 4 input AND gate will detect any number, including a 3 count, you need. Personally I prefer thewhich is very similar in many ways.
It counterr what I thought you were talking about originally. Perhaps you could show us the count sequence you are after? BTW, most counters are sequential, which means a 3 count would be something like Oct 8, 8.
Oct 8, 9. Is that your entire count? You could use much simpler chips, such as dual flip flops. I suspect this is a sledgehammer approach to a simple problem. While I don’t have the schematic handy, two JK flip flops will do the count directly wired appropriately, while the reset method will countre a transient number that changes very fast.
They are used for old style digital clocks time pieces. Look at internal schematics of the and for example. Oct 9, I still don’t get the part to terminate the count after three clock cycles period. Dec 5, 5, This should help quite a bit: It will make great sense once you watch it. When your done, here is the video index: The problem I see with using a is simple, no reset pin.
I’m spoiled, I have cultivated a really deep stock of parts so I can write articles and wire stuff on whim. For example, see Project: As it is, you going to have to use extra gates just to add a feature similar to reset.
Unless this is a must do as in school assignment I suspect you would be better off stepping back and getting something like a If you have a choice CMOS is much better, since it will operate off of any voltage you care to use, no precision power supplies needed.
Having said that, I notice cell phones and other devices have some really small wall warts that are 5V 1A, which I would have killed for in my TTL days. I tend to use diode gates a lot, they are ckunter to lay out and do the job.
Do you want me to sketch out something using the that is a simple counter? It will require extra gates.
Texas Instruments SN74191N Synchronous 4-Bit Up/Down Binary Counters
I think I have maybe I’ll try take a look and understand the datasheet first Coutner, this counfer a standard question, one you don’t have to answer. It does help us refer sources and parts. What part of the world are you in? You’ll note most of the old hands have it in their profile, this is why. I’m looking to the datasheet right now, but didn’t notice anything. That is to cascade counters, so it can count up and down. One part is BCD, the other is binary.
Datasheet pdf – Synchronous 4-Bit Up/Down Counter with Mode Control – Fairchild Semiconductor
Look at post 7, I posted a pinout I made as part of my PaintCAD package used for quick and dirty drawing of schematics. Think pin 14 clear. AH now I see I’m so sorry I’m a bit slow. Its all in this video: Again, not the best way, there are better. When the count 11 the chip is cleared.
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