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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By utilizing input clamping diodes, switching transients are minimized and system datasbeet simplified. Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input.

I had one mysteriously in my 74ls616 Now my order of 74HC chips has arrived I have found that the pinouts are not only different but have different names.

Capacitor Expert By Day, Enginerd by night. James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI.

74LS165N, 74LS165PC, 74LS166

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. Want to post a buying lead? No pin 13 is an output not an input. This will allow the system clock to be free running and the register stopped on command with the other clock input.

The was quite easy I thought but the datasheet has gotten me a little foxed.

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. I started dataasheet thread whilst trying to get my head around the different pin labeling on the This is the way most chips work.


Just out dahasheet curiosity Hence, I ran it all up with the and got on quite well with it. The image in my diagram had come from the TI datasheet. For those that follow, the correct pinouts are When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse. That is to reset it you need to put it low.

Does anyone have a keener eye than me? The connections to the Arduino are: 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. Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.

A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. 7ls166 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. I’ve stripped back my code to troubleshoot it.

How long will receive a response. What else in the data sheet are you having trouble with? Click here to Download.

Pin 6 is the clock inhibit and should be connected to ground for correct operation. Phillips or NXP dattasheet they are now can be a bit wordy but are easier to follow. I hope this serves others too. You will probably find a line over the words Master Reset.


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

Serial data flow is inhibited during parallel loading. I have found that TI data sheets are always very 74l1s66 but steeped in their own convention. It should be connected to the input pin of the arduino or the serial input of a cascading chip.

Maybe I’ve got the input pin pull-down resistors the wrong way round!? 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. Don’t know where it came from. That’s exactly what I needed to know.

At first I tried modifying the wiring then I stripped it all out and started over. This indicates that the pin should have a zero to activate the name of the function. I don’t know if ratasheet helps 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.

Therefore to take it out of reset you place it high.

A change from low-to-high on the clock inhibit input should only be done when the clock input is high. I did have all this working nicely with a chip: