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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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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.

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. I did have all this working nicely with a chip: The connections to the Arduino are: Pin 6 is the clock inhibit and should be connected to ground for correct operation. Want to post a buying lead? I hope this serves others too. I started this thread whilst trying to get my head around the different pin labeling on the I have found that TI data sheets are always very thorougher but steeped in their own convention.

By utilizing input clamping diodes, switching transients are minimized and system design simplified. Just out of curiosity You will probably find a line over the words Master Reset.


No pin 13 is an output not an input. Therefore to take it out of reset you place it high.

74LS165N, 74LS165PC, 74LS166

Phillips or NXP as they are now 74ld166 be a bit wordy but are easier to follow. 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.

This indicates that the pin should have a zero to activate the name of the function. Yep, I’m getting that. A change from low-to-high on the clock inhibit input should only be done when the clock input is high. That is to reset it you need to put it low. This is what I have so far Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.

Hence, I ran it all up with the and got on quite well with it. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.

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. That’s exactly what I needed to know. Serial data flow is inhibited during parallel loading.

At first I tried modifying the wiring then I stripped it all out and started over.

74HC pinouts (shiftIN)

How long will receive a response. My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits.


A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input.

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.

Don’t know where it came from. It should be connected to the input pin of the arduino or the serial input of a cascading chip. I’ve stripped back my code to troubleshoot it.

James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. Does anyone have a keener eye than me? The was quite easy I thought but the datasheet has gotten me a little 74os166.

This will allow the system clock to be free running and the register stopped on command with the other clock input. For those that follow, the correct pinouts are This is the way most chips work. Capacitor Expert By Day, Enginerd by night.

Maybe I’ve got the input pin pull-down resistors the wrong way round!? I don’t know if this helps What else in the data sheet are you having trouble with?