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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Serial data flow is inhibited during parallel loading. Yep, I’m getting that. At first I tried modifying the wiring then I stripped it all out and started over. 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.

The connections to the Arduino are: Don’t know where it came from. How long will receive a response. James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. It should be connected to the input pin of the arduino or the serial input of a cascading chip. Just out of curiosity Datasheer 6 is the clock inhibit and should be connected to ground for correct operation.

I started this thread dxtasheet trying to get my head around the different pin labeling on the Does anyone have a keener eye than me? I did have all this working nicely with a chip: Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.


Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input. This indicates that the pin should have a zero to activate the name of the function. 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.

74LS Datasheet(PDF) – TI store

By utilizing input clamping diodes, switching transients are minimized and system design simplified. This is the way most chips work. 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.

For those that follow, the correct pinouts are Phillips or NXP as they are now can be dataseet bit wordy but are easier to follow.

74LS165N, 74LS165PC, 74LS166

The was quite easy I thought but the datasheet has gotten me a little foxed. This is what I have so far You will probably find a line over the words Master Reset. I don’t know if this helps I had one mysteriously in catasheet 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. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.

The image in my diagram had come from the TI datasheet. I have found that TI data sheets are always very thorougher but steeped in their own convention. Capacitor Expert By Day, Enginerd by night. No pin 13 is an output not an input. Want to post a buying lead?


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. That is to reset it you need to put it low. I hope this serves others too. Click here to Download.

This will allow adtasheet system clock to be free running and the register stopped on command with the other clock input. What else in the data sheet are you having trouble with? I’ve stripped back my code to troubleshoot it.

My friend and I had both ordered some s but during catasheet 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.

That’s exactly what I needed to know. 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 74os166 PIN 15 is connected to Ard 8, but is hidden.

A change from low-to-high on the clock inhibit input should only be done when the clock input is high.