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 have found that TI data sheets are always very thorougher but steeped in their own convention. Serial data flow is inhibited during parallel loading.

James’ datasheet link yields a darasheet friendlier datasheet than the one I’d found from TI. Therefore to take it out of reset you place it high.

74LS165N, 74LS165PC, 74LS166

That’s exactly what I needed to know. This will allow the system clock to be free running and the register stopped dataasheet command with the other clock input. I hope this serves others too. No pin 13 is an output not an input. It should be connected to the input pin of the arduino or the serial input of a cascading chip.

A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. Phillips or NXP as they are now can be a bit wordy but are easier to follow. Yep, I’m getting that.

Pin 6 is the clock inhibit and should be connected to ground for correct operation. The image in my diagram had come from the TI datasheet.


The LS dataheet a parallel-in or serial-in, serial-out shift register and has a complexity 74ls66 77 equivalent gates with gated clock inputs and an overriding clear input. I did have all this working nicely with a chip: Just out of curiosity I’ve stripped back my code to troubleshoot it. The was quite easy I thought but the datasheet has gotten me a little foxed. Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input.

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

What else in the data sheet are you having trouble with? Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled. Hence, I ran it all up with the and got on quite well with it. My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits. You will probably find a line over the words Master Reset.

I started this thread whilst trying to get my head around the different pin labeling on the A change from datashfet on the clock inhibit input should only be done when the clock input is high.

Want to post a buying lead? Does anyone have a keener eye than me?

Don’t know where it came from. This indicates that the pin should have a zero to activate the name of the function. For those that follow, the correct pinouts are 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 working.

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.


74HC pinouts (shiftIN)

That is to reset it you need to put dataseet low. How long will receive a response. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse. I don’t know if this helps The connections to the Arduino are: Maybe I’ve got the input pin pull-down resistors the wrong way round!?

Click here to Download. 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. This is the way most chips work. By utilizing input clamping diodes, switching transients are minimized and system design simplified. At first I tried modifying the wiring then I stripped it all out and started over.

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. Capacitor Expert By Day, Enginerd by night. This is what I have so far Your buying lead can then be posted, and the reliable suppliers will quote via our online message datashee or other channels soon.