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 image in my diagram had come from the TI datasheet.

74LS Datasheet(PDF) – TI store

For those that follow, the correct pinouts are Want to post a buying lead? This is the way most chips work.

I did have all this working nicely with a chip: My friend and I had both ordered datasbeet s but during the shipping wait I happily found a in my stash dxtasheet bits.

Therefore to take it out of reset you place it high. You will probably find a line over the words Master Reset.

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. How long will receive a response. Pin 6 is the clock inhibit and should be connected to ground for correct operation. Don’t know where it came from. I hope this serves others too. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.

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Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.

Clocking is done on the low-to-high level edge of the clock 74la166 via a two input positive NOR gate, which permits one input to be used as a clock enable or clock inhibit function.

I started this thread whilst trying to get my head around the different pin labeling on the The was quite easy I thought but the datasheet has gotten me a little foxed.

Click here to Download. A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. A change from low-to-high on the clock inhibit input should only be done when the clock input is high.

74LS165N, 74LS165PC, 74LS166

Phillips or NXP as they are now can be a bit wordy but are easier to follow. The connections to the Arduino are: I don’t know if this helps This indicates that the pin should have a zero to activate the name of the function.

Serial data flow is inhibited during parallel loading. This will allow the system clock to be free running and the register stopped on command with the other clock input.


74HC pinouts (shiftIN)

By utilizing input clamping diodes, switching transients are minimized and system design simplified. It should be connected to the input pin of the arduino or the serial input of a cascading chip.

The most misleading daasheet 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.

Just out of curiosity We didn’t get time to make the swap back then but 744ls166 project is back on the table now and we’re both stumped as to why it’s not working. That’s exactly what I needed to know.

Yep, I’m satasheet that. This is what I have so far What else in the data sheet are you having trouble with? I have found that TI data sheets are always very thorougher but steeped in their own convention. Maybe I’ve got the input pin pull-down resistors the wrong way round!?