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.

Author: Diktilar Mauzragore
Country: Tanzania
Language: English (Spanish)
Genre: Music
Published (Last): 20 July 2015
Pages: 89
PDF File Size: 5.73 Mb
ePub File Size: 12.73 Mb
ISBN: 731-3-68999-195-1
Downloads: 98222
Price: Free* [*Free Regsitration Required]
Uploader: Meztirg

Therefore to daatasheet it out of reset you place it high. I did have all this working nicely with a chip: This will allow the system clock to be free running and 74ls1666 register stopped on command with the other clock input. Pin 6 is the clock inhibit and should be connected to ground for correct operation. I don’t know if this helps This is the way most chips work.

I started this thread whilst trying to get my head around the different pin labeling on the By utilizing input clamping diodes, switching transients are minimized and system design simplified.

Don’t know where it came from. Click here to Download. The was quite easy 74l1s66 thought but the datasheet has gotten me a little foxed.

Does anyone have a keener eye than me? Capacitor Expert By Day, Enginerd by night.

My friend and I had both ordered some s but during the shipping wait I happily found a in my stash of bits. At first I tried modifying the wiring datasheeh I stripped it all out and started over. Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.


74LS165N, 74LS165PC, 74LS166

Serial data flow is inhibited during parallel loading. You will probably find a line over the words Master Reset. The connections to the Arduino are: I hope this serves others too. I’ve stripped back my code to troubleshoot it.

Yep, I’m getting that. It should be connected to the input pin of the arduino or the serial input of a cascading chip. Clocking is inhibited when either of the clock inputs are held high, holding datasheett input low enables the other clock input. No pin 13 is an output not an input.

74HC pinouts (shiftIN)

Maybe I’ve got the input pin pull-down resistors the wrong way round!? James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.

What else in the data sheet are you having trouble with? Just out of curiosity Want to post a buying lead? Hence, I ran it all up with the and got on quite well with it. The image in my diagram had 74l1s66 from the TI datasheet.

This is what I have so far I have found that TI data sheets are always very thorougher but steeped in their own convention. For those that follow, the correct pinouts are That’s exactly what I needed to know. 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.

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. 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.


A change from low-to-high on the clock inhibit input should only be done when the clock input is high. This indicates that the pin should have a zero to activate the name of the function.

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. Phillips or NXP as they are now can be a bit wordy but are easier to follow. 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. 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.