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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This will allow the system clock to be free running and the register stopped on command with the other clock input. That’s exactly what I needed to know.

Clocking is inhibited when either of the clock inputs are held high, holding either input datashet enables the other clock input. 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: At first I tried modifying the wiring then I stripped it all out and started over.

Capacitor Expert By Day, Enginerd by night.

74LS 데이터시트(PDF) – Motorola, Inc

James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. Yep, I’m getting 74ls616. The was quite easy I thought daatasheet the datasheet has gotten me a little foxed. I’ve stripped back my code to troubleshoot it. Hence, I ran it all up with the and got on quite well with it.


Just out of curiosity 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.

This indicates that the pin should have a zero to activate the name daasheet the function. You will probably find a line over the words Master Reset. The image in my diagram had come from the TI datasheet.

74LS165N, 74LS165PC, 74LS166

Maybe I’ve got the input pin pull-down resistors the wrong way round!? For those that follow, the correct pinouts are Therefore to take it out of reset you place it high. 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.

A buffered direct clear input overrides all dstasheet inputs, including the clock, and sets all flip-flops to zero. This is the way most chips work. 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.


Serial data flow is inhibited during parallel loading. I did have all this working nicely with a chip: Clocking is done on the low-to-high level edge of the clock pulse via a two input positive NOR datashet, which permits one input to be used as a clock enable or clock inhibit function.

74LS Datasheet(PDF) – TI store

My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits. Pin 6 is the clock inhibit and should be connected to ground for correct operation.

No pin 13 is an output not an input. How long will receive a response. We didn’t get datasheer 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.

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