These parallel-in or serial-in, serial-out shift registers fea- ture gated clock inputs and an overriding clear input. All inputs are buffered to lower the drive. 74LS Counter Shift Registers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74LS Counter Shift Registers. Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor.

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I don’t know if this helps A change from low-to-high on the clock inhibit input should only be done when the clock input is high. I started this thread whilst trying to get my head around the different pin labeling on the Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.

Don’t know where it came from. I’ve stripped back my code to troubleshoot it. Phillips datashet NXP as they 74ls1666 now can be a bit wordy but are easier to follow. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.

That’s exactly what I needed to know. The LS is a parallel-in or serial-in, serial-out shift register and has a complexity of 77 equivalent gates with gated clock inputs and an overriding clear input.

74LS165N, 74LS165PC, 74LS166

It should be connected to the input pin of the arduino or the serial input of a cascading chip. Just out of curiosity How long will receive a response. I had one mysteriously in my box-o-bits Now my order of 74HC chips has arrived I have found that the pinouts are not only different but have different names.

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Click here to Download. Serial data flow is inhibited during parallel loading. Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.

Does anyone have a keener eye than me? Pin 6 is the clock inhibit and should be connected to ground for correct operation. For those that follow, the correct pinouts are The was quite easy I thought but the datasheet has gotten me a little foxed.

Therefore to take it out of reset you place it high. This is what I have so far The most misleading part of this image however is that the blue lead from Arduino GND looks like it goes to PIN 15 on the – it actually goes to the ground rail and PIN 15 is connected to Ard 8, but is hidden.

We didn’t get time to make the swap back then but the project is back on the table now and we’re both stumped as to why it’s not dztasheet. Clocking is done on the low-to-high level edge of the clock pulse via a two input positive NOR gate, which permits one input to be used as a clock enable or clock inhibit function.

At first I tried modifying the wiring then I stripped it all out and started over. Want to post a buying lead?

By utilizing input clamping diodes, switching transients are minimized and system vatasheet simplified. This will allow the system clock to be free running and the register stopped on command with the other clock input.

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Motorola 74LS Series Datasheets. 74LS, SN54LS Datasheet.

Hence, I ran it all up datashewt the and got on quite well with it. You will probably find a line over the words Master Reset. This indicates that the pin should have a zero to activate the name of the function. This is the way most chips work.

I did have all this working nicely with a chip: I hope this serves others too. No pin 13 is an output not an input. A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. Capacitor Expert By Day, Enginerd by night.

Maybe I’ve got the input pin pull-down resistors the wrong way 7ls166 That is to reset it you need to put it low. The image in my diagram had come from the TI datasheet. My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits.

Yep, I’m getting that.

The connections to the Arduino are: What else in the data sheet are you having trouble with? I have found that TI data sheets datashwet always very thorougher but steeped in their own convention. James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input.