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

This is what I have so far 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. What else in the data sheet are you having trouble with?

Capacitor Expert By Day, Enginerd by night. Pin 6 is the clock inhibit and should be connected to ground for correct operation.


That’s exactly what I needed to know. James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI.

For those that follow, the correct pinouts are Yep, I’m getting that. The image in my diagram had come from the TI datasheet.

I hope this serves others too. I have found that TI data sheets are always very thorougher but steeped in their own convention. Phillips or NXP as they are now can be a bit 74lss166 but are easier to follow.

74LS 데이터시트(PDF) – Motorola, Inc

I did have all this working nicely with a chip: I’ve stripped back my code to troubleshoot it. Does anyone have a keener eye than me? At first I tried modifying the wiring then I stripped it all out and started over. Maybe I’ve got the input pin pull-down resistors the wrong way round!?

74LS165N, 74LS165PC, 74LS166

Just out of curiosity My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits. Dagasheet know where it came from.

Hence, I ran it all up with the and got on quite well with it. I started this thread whilst trying to get my head around the different pin labeling on the 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 don’t know if this helps 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.


The connections to datasgeet Arduino are: 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.

74LS Datasheet(PDF) – TI store

That is to reset it you dafasheet to put it low. Therefore to take it out of reset you place it high. This is the way most chips work.